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Static softening mechanisms and recrystallization kinetics of martensitic heat-resistant steel 40Cr10Si2Mo in double-pass thermal deformation 认领 引用
1
作者 Tong-Yao Yang Qing-Juan Wang +2 位作者 Zhong-Ze Du Jing Yang Zhi-Meng Yan 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第1期210-227,共18页
Single-pass and double-pass high-temperature deformation experiments were conducted on 40Cr10Si2Mo steel using a Gleeble-3500 thermal simulator.The static recrystallization(SRX)behavior and recrystallization mechanism... Single-pass and double-pass high-temperature deformation experiments were conducted on 40Cr10Si2Mo steel using a Gleeble-3500 thermal simulator.The static recrystallization(SRX)behavior and recrystallization mechanisms of 40Cr10Si2Mo steel were investigated under deformation temperatures of 900-1100℃,deformation strains of 10%,20%,and 30%,and inter-pass times of 1-120 s.A static recrystallization fraction model was developed.The results showed that the SRX volume fraction increased with higher deformation temperature,larger deformation amount,and longer inter-pass time,with the deformation temperature having the most significant effect on SRX.During the deformation process,different process parameters led to different internal deformation mechanisms of the material.Static recovery and continuous static recrystallization(CSRX)dominated deformation at lower temperatures through progressive lattice rotation.In comparison,at higher temperatures,the deformation mechanism was dominated by CSRX and discontinuous static recrystallization(DSRX).The nucleation mechanisms of the SRX process were grain boundary bulging nucleation and subgrain merging nucleation,with grain boundary bulging present under all conditions.Subgrain merging nucleation could provide an additional nucleation mode at lower deformation temperatures or lower deformation amounts.Based on the traditional Avarmi equation,a modified model coefficient was used to establish the SRX kinetic model for 40Cr10Si2Mo steel.The linear correlation coefficient R2 between the predicted and experimental static recrystallization volume fraction was 0.96702,indicating high prediction accuracy. 展开更多
关键词 40Cr10Si2Mo steel Double-pass hot deformation Static softening Recrystallization mechanism Recrystallization kinetics
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Effect of carbon on recrystallization and grain growth behavior of carbide-free FeMnCoNiCx high-entropy alloys 认领 引用
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作者 Chang LIU Zhe JIANG +5 位作者 Wei FANG Hao-yang YU Jin-fei ZHANG Tie-xu PENG Xin ZHANG Fu-xing YIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第5期1610-1622,共13页
The impact of interstitial carbon on recrystallization behavior was investigated in designed carbide-free FeMnCoNiCx high-entropy alloys(HEAs)by utilizing weak carbide-forming elements.The results indicate that rec... The impact of interstitial carbon on recrystallization behavior was investigated in designed carbide-free FeMnCoNiCx high-entropy alloys(HEAs)by utilizing weak carbide-forming elements.The results indicate that recrystallization and grain growth are both effectively facilitated in carbon-containing high-entropy alloys.Under identical cold rolling conditions,carbon-containing HEAs exhibit higher dislocation density and deformation stored energy,which facilitates the recrystallization behavior.Meanwhile,the activation energy for grain growth in carbon-containing alloys is lower than that in carbon-free alloys.Diffusion couple experiments reveal that the addition of carbon increases the diffusion coefficients of metallic elements,thereby reducing the activation energy for grain growth and consequently accelerating grain coarsening.This phenomenon stands in sharp contrast to the conventional understanding,in which carbon suppresses recrystallization by forming carbide secondary phases that pin grain boundaries. 展开更多
关键词 high-entropy alloy interstitial carbon cold rolling deformation recrystallization grain growth diffusion
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The recrystallization mechanism and its effects on texture in pre-twinned AZ31 magnesium alloy during medium-high temperature impact loading 认领 引用
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作者 Xiao Liu Xiaofeng Zhang +6 位作者 Biwu Zhu Chao Xie Bibo Hu Wenhui Liu Luoxing Li Congchang Xu Pengcheng Guo 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第1期459-475,共17页
Investigating effect of recrystallization mechanism on deformation mode and texture evolution is conducive to controlling deformation mechanism and texture in magnesium alloys under medium-high temperature impact load... Investigating effect of recrystallization mechanism on deformation mode and texture evolution is conducive to controlling deformation mechanism and texture in magnesium alloys under medium-high temperature impact loading.In the present study,a Johnson-Cook model incorporating twin strengthening was established to simulate macro-deformation,and a twinning induced recrystallization(TDRX)model and bulging recrystallization(GBBDRX)model are introduced into visco-plastic self consistant(VPSC)framework to quantitatively study the deformation mechanism of pre-twinned AZ31 magnesium alloy during medium-high temperature impact loading.Both TDRX and GBBDRX occur,with basal slip as the dominant slip system,followed by pyramidal〈c+a〉slip and prismatic slip.The dynamic recrystallization(DRX)significantly influences basal and pyramidal〈c+a〉slip systems,with minimal impact on secondary deformation mechanism.In addition,the recrystallization mechanism of grain boundary bowing increases the activity of basal slip and decreases the activity of pyramidal〈c+a〉slip.The nucleation and growth of recrystallized grains enhance basal slip activity and suppress pyramidal〈c+a〉slip,leading to the formation of a strong basal texture.As dynamic recrystallization progresses,a bimodal texture develops,characterized by a reduction in basal component pole density and a more pronounced basal slip. 展开更多
关键词 Az31 magnesium alloy Texture Deformation mode Dynamic recrystallization Impact loading
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Revealing the dynamic recrystallization and deformation instability of TiC reinforced AZ61 composites with uniform structure and bimodal grain structure 认领 引用
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作者 Lingling Fan Ying Zeng +7 位作者 Lingbao Ren Yanyan huang Kunyang Fan Zhenyu Zhu Ran Ni Gaofeng Quan Wei Feng Hajo Dieringa 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期387-408,共22页
Although microstructural configuration significantly enhances composites’comprehensive mechanical properties,its influence on hot deformation remains unclear.To investigate the effects of microstructural configuratio... Although microstructural configuration significantly enhances composites’comprehensive mechanical properties,its influence on hot deformation remains unclear.To investigate the effects of microstructural configurations on hot workability,dynamic recrystallization(DRX)mechanisms and instability mechanisms,hot compression tests were conducted on two TiC/AZ61 composites(bimodal/uniform structures)with constitutive modeling,processing maps,and microstructure observations.The results show that uniform composite exhibits better hot workability,lower deformation activation energy(Q)and smaller instability regions than bimodal composite.The uniform composite primarily undergoes continuous DRX(CDRX),while the bimodal composite involves both CDRX and discontinuous DRX(DDRX)mechanisms.At low temperatures(T)and high strain rates(˙ε),the uniform composite achieves sufficient DRX,whereas the bimodal composite experiences only partial DRX accompanied by twinning.At high T and low˙ε,the uniform composite is prone to grain boundary sliding(GBS)due to fine grains,causing to micro-voids formation;the bimodal composite undergoes abnormal grain growth(AGG),leading to instability.The favorable hot-processing regions for the bimodal composite are(260-320℃,0.0009-0.03 s-1)and(325-370℃,0.0001-0.0003 s-1),while those for the uniform composite are(260-310℃,0.01-0.1 s-1)and(250-300℃,0.0001-0.0005 s-1).This work offers in-depth insights into DRX and deformation instability in magnesium matrix composites with different initial structures.It provides a guidance for their selection of hot working processes. 展开更多
关键词 Magnesium matrix composite Bimodal structure Hot deformation Dynamic recrystallization Deformation instability
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Development and application of a modified GTN damage model for AZ31 magnesium alloys considering twinning and dynamic recrystallization 认领 引用
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作者 Famei Liu Junsong Jin +6 位作者 Chang Gao Fei Du Jinchuan Long Hongning Wen Lei Deng Xuefeng Tang Xinyun Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第6期216-233,共18页
The poor room-temperature formability limits the widespread engineering application of magnesium alloy,necessitating hot deformation processes where damage evolution is critically influenced by microstructure.While th... The poor room-temperature formability limits the widespread engineering application of magnesium alloy,necessitating hot deformation processes where damage evolution is critically influenced by microstructure.While the present damage models overlook the specific roles of dynamic recrystallization(DRX)and twinning,which are pivotal in magnesium alloys.Given this limitation,this study developed a microstructure-related Gurson-Tvergaard-Needleman(GTN)damage model for AZ31 alloy under high-temperature conditions.The model was calibrated based on uniaxial tension tests conducted at 300°C,which revealed that DRX suppresses void initiation and growth,whereas twinning promotes shear damage.The modified model was subsequently applied to simulate the wedging spinning process.Comparisons between simulations and experiments confirmed the model’s reliability in predicting deformation,microstructure distribution,and damage.The analysis revealed that during early stage of the process,the DRX fraction is higher near the inner and outer surfaces of the conical wall and lower in the middle layer,whereas the twin volume fraction follows the opposite trend.In the later stage,DRX occurs throughout the entire conical wall while twinning is nearly completely consumed.The study identifies shear damage,correlated with equivalent strain,as the primary damage mechanism,while void evolution is influenced by fluctuations in stress triaxiality.Furthermore,it was found that excessively small spinning thicknesses and large dip angles exacerbate the risk of inner surface cracking.This established model proves to be effective for predicting damage and optimizing process parameters in the hot spinning of AZ31 alloys. 展开更多
关键词 Magnesium alloy Dynamic recrystallization Twinning Damage model Spinning process.
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Twinning activation and dynamic recrystallization behavior of AZ61 tubes in electro-assisted bending 认领 引用
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作者 Hong Xu Hanrong Cai +4 位作者 Shuaifeng Chen Wenlong Liu Kai Guan Xiuming Cheng You Fang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第5期236-253,共18页
The structure profile of magnesium alloy tube is difficult to control for complex microstructural evolution under the asymmetric loading of tension and compression induced during tube bending.This study investigates t... The structure profile of magnesium alloy tube is difficult to control for complex microstructural evolution under the asymmetric loading of tension and compression induced during tube bending.This study investigates the electro-assisted bending of extruded AZ61(Mg-6Al-1Zn)magnesium alloy tubes,with particular focus on the influence of pulsed current on microstructure evolution and plastic deformation mechanisms under varying degrees of deformation.The results indicate that pulsed current increases the fraction of{1012}tensile twins and effectively regulates twin nucleation positions along the tangential cross-sections on both sides of the bending head.The initially disordered twin distribution is transformed into a more ordered arrangement,thereby enhancing radial microstructural uniformity during bending.The thermal and electromagnetic energy generated by the current promotes the alignment or polarization of twins and dislocations along specific directions.This phenomenon suggests that pulsed current can improve the formability of magnesium alloy tubes through distinctive microstructural modifications.These findings offer valuable insights into microstructure control and bending ability enhancement of magnesium alloy tube. 展开更多
关键词 Magnesium alloy tube Electro-assisted bending Twinning behavior Dynamic recrystallization
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Hot deformation behavior and dynamic recrystallization mechanisms of Fe-Cr-Al-Mo-Nb-Ti alloy 认领 引用
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作者 Ye Liu Wen-Zhuo Xiao +6 位作者 Pei-Nan Du Lin Zhang Jie-Ming Tian Shuang He Xu Chen Oleg-IGorbatov Xuan-Hui Qu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第5期1-17,共17页
The hot deformation behavior and microstructural evolution of an Fe-13Cr-4.5Al-2Mo-0.6Nb-0.6Ti alloy were systematically investigated using isothermal compression tests.Dynamic recrystallization mechanisms and their i... The hot deformation behavior and microstructural evolution of an Fe-13Cr-4.5Al-2Mo-0.6Nb-0.6Ti alloy were systematically investigated using isothermal compression tests.Dynamic recrystallization mechanisms and their influencing factors during high-temperature deformation were elucidated based on scanning electron microscope,electron backscatter diffraction,and transmission electron microscope(TEM)observations.Results reveal that discontinuous dynamic recrystallization(DDRX),continuous dynamic recrystallization(CDRX),and geometric dynamic recrystallization(GDRX)coexist under certain conditions,with their relative contributions depending on temperature and strain rate.At 900℃,lower strain rates promote the transformation from dynamic recovery to CDRX,while higher strain rates favor DDRX nucleation.At 1200℃,DDRX and CDRX dominate due to enhanced grain boundary mobility and reduced pinning from dissolved Laves phases,resulting in larger recrystallized grains.The microstructure exhibitsγ-fiber andθ-fiber textures,where strain-induced boundary migration between these fibers facilitates DDRX,andθ-fiber grains are more prone to GDRX.TEM analysis confirms the formation of nanoscale C14-type hexagonal Laves phases containing Nb,Ti,and Mo,which effectively inhibit subgrain growth and abnormal grain coarsening through strong dislocation pinning,thereby stabilizing the microstructure.Notably,the fine and uniformly dispersed Laves phases at 900℃contribute to refined grain structures,enhancing mechanical properties and thermal stability. 展开更多
关键词 FeCrAl alloy Hot deformation behavior Dynamic recrystallization Texture Laves phase
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Effect of Y on hot deformation behavior and recrystallization behavior of as-cast Ni-Cr-Al superalloy 认领 引用
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作者 Yi-Jie Zhang Xing-Chuan Xia +8 位作者 Jun-Yi Luo Zhi-Gang Wang Hao-Min Feng Jun Li Jian Ding Lin-Jun Chen Chao Ye Meng-Shuai Yan Xiao-Yang Li 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期293-307,共15页
Y element affects hot workability and leads to cracking of alloys during forging,so that it is crucial to explore the effect of Y on the hot workability of Ni-Cr-Al superalloy to optimize hot working process.The hot d... Y element affects hot workability and leads to cracking of alloys during forging,so that it is crucial to explore the effect of Y on the hot workability of Ni-Cr-Al superalloy to optimize hot working process.The hot deformation behavior is investigated by isothermal compression with the temperature ranging from 1050 to 1150℃and strain rate ranging from 0.01 to 10 s-1.The results show that flow stress increases first and then decreases as Y content rises.Strain-compensated Arrhenius constitutive equations are modeled for three Y-content superalloys,respectively,which could better predict flow stresses.During hot deformation,Y dissolving in matrix hinders dislocation movement and dynamic recrystallization growth.Meanwhile,Y refined grains and increased Ni5Y phase,providing more dynamic recrystallization nucleation sites and driving force.Therefore,with the increase in Y element,dynamic recrystallization fraction shows the tendency to decrease first and then increase.Although excess Y has a facilitating effect on dynamic recrystallization,it leads to an increased risk of cracking due to excessive internal precipitation phases and grain boundaries. 展开更多
关键词 Ni-Cr-Al superalloy Y element Hot deformation Constitutive analysis Dynamic recrystallization
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The influence of alloying on recrystallization behavior and texture development of Mg-(Ca,Zn)alloys 认领 引用
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作者 Rogine A.Gomez Daniel P.Veghte +2 位作者 David J.Rowenhorst Bruce W.Williams Aeriel D.Murphy-Leonard 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期176-201,共26页
The influence of alloying Mg with Ca and Zn on the microstructural and texture evolution of binary Mg-2Zn(wt.%)and Mg-0.5Ca(wt.%)during static recrystallization(SRX)was systematically quantified using in situ techniqu... The influence of alloying Mg with Ca and Zn on the microstructural and texture evolution of binary Mg-2Zn(wt.%)and Mg-0.5Ca(wt.%)during static recrystallization(SRX)was systematically quantified using in situ techniques.In situ heating experiments were conducted inside of a scanning electron microscopy(SEM)equipped with an electron backscatter diffraction(EBSD)detector and a heating stage to track the nucleation and growth of strain-free grains throughout the entire annealing process.This enabled the sequential mapping of specific regions of interest throughout the recovery and recrystallization processes.In Mg-2Zn,deformation was accommodated mainly through extension{1012}twinning and{1011-1012}and{1013-1012}double twinning.These twin interfaces and twin nucleation sites along grain boundaries served as preferential sites for the nucleation of recrystallized grains.Additionally,the deformed texture was retained even after recrystallization due to the new grains inheriting the orientation of the twinned grains.In Mg-0.5Ca,multiple twinning systems were activated such as extension{1012}twinning,{1011}and{1013}contraction twinning,and{1011-1012}and{1013-1012}double twinning.Contraction and double twins served as preferred nucleation sites for recrystallized grains due to the higher strain energy generated within these regions.With more nucleation sites available within the Mg-0.5Ca microstructure,the resulting recrystallized crystallographic orientation exhibited a weaker texture compared to Mg-2Zn. 展开更多
关键词 Mg-Zn alloy Mg-Ca alloy Static recrystallization Multiscale characterization Electron microscopy
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Microstructure and dynamic recrystallization behavior of cryo-rolled Al–3 wt%Nd alloy 认领 引用
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作者 Dongyang Tang Shuan Li +9 位作者 Zhiqiang Wang Xiaowei Zhang Daogao Wu Hongbo Yang Shengxi Wu Lu Zhang Minglei Xu Shuang Wang Lulu Wu Senhui Wang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第6期1925-1934,I0008,共10页
The Al-Nd alloy has recently garnered significant attention owing to its widespread application in thinfilm-transistor liquid crystal displays(TFT-LCDs).In this study,we investigated the microstructure and dynamic rec... The Al-Nd alloy has recently garnered significant attention owing to its widespread application in thinfilm-transistor liquid crystal displays(TFT-LCDs).In this study,we investigated the microstructure and dynamic recrystallization(DRX)behavior of the cryo-rolled Al-3 wt%Nd alloy by adopting an experime ntal approach to elucidate the mechanism for the occurre nce of DRX during cryorolling.Fo r the cryorolled Al-3 wt%Nd alloy,with an increase in rolling reduction,the pro-eutecticα-Al phases are gradually elongated,and meanwhile,the rod-like eutecticα-Al11Nd3 phases are initially cracked and then turn into granules,resulting in morphological changes in both pro-eutectic and eutectic regions during cryorolling.Orientation distribution functions reveal a trend that weaker and more randomized textures,such as Cube{001}and BR{236}texture components,tend to develop at large strains during cryorolling.In eutectic regions,the DRX is facilitated and accelerated by eutecticα-Al11Nd3 phase particles,leading to the completion of DRX at 60%reduction in these regions.Meanwhile,in pro-eutectic regions,the DRX proceeds via the formation of the low angle grain boundaries(LAGBs),the transformation of the LAGBs into the high angle grain boundaries(HAGBs),and then the migration of the HAGBs.The pro-eutectic regions are almost fully recrystallized,and the cryo-rolled Al-3 wt%Nd alloy has an average grain size of 54.4μm as rolling reduction increases to 90%,demonstrating an effective grain refinement after DRX.Furthermore,Vickers microhardness measurements provide additional evidence confirming the occurrence of DRX during cryorolling.The findings herein offer new insights into the fabrication of the Al-3 wt%Nd alloy sputtering target used in TFT-LCDs. 展开更多
关键词 Al-3 wt%Nd alloy Rare earths Cryorolling Microstructure Microhardness Dynamic recrystallization
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High strength,toughness and corrosion resistant super ferritic stainless steel engineered by Laves phase control and recrystallization annealing 认领 引用
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作者 Cheng-Zhe Qi Hui-Hu Lu +3 位作者 Ling-Yun Du Wei-Dong Qiao Ze-Yang Li Sheng-Chao Yang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期85-102,共18页
The recrystallization microstructure,texture,precipitation behavior,and their effects on the mechanical and corrosion properties of a cold-rolled 26.7Cr-3.7Mo-2Ni super ferritic stainless steel sheet containing pre-pr... The recrystallization microstructure,texture,precipitation behavior,and their effects on the mechanical and corrosion properties of a cold-rolled 26.7Cr-3.7Mo-2Ni super ferritic stainless steel sheet containing pre-precipitated Laves phases are investigated after annealing at 950-1090℃for 1 min.Annealing at 950-990℃induced partial dissolution of sub-micron Laves phases,promoting extensive precipitation of nano-sized Laves particles at subgrain and grain boundaries.These nano-particles pinned boundaries,suppressing subgrain coalescence in//ND-oriented grains and inhibiting full recrystallization,resulting in a mixed texture of weakγ-fiber combined with strongα-andα*-fibers.The residual Laves phases promoted pit initiation leading to high corrosion rate.In contrast,annealing at 1010-1090℃further dissolved sub-micron Laves phases,reduced nano-sized precipitation,and enabled complete recrystallization.Under these conditions,the average corrosion rate remained consistently low,while a singular,strongγ-fiber texture progressively intensified with temperature.The optimal combination of properties was achieved at 1030℃,exhibiting a tensile strength of 680 MPa,yield strength of 530 MPa,elongation of 24.65%,and an average corrosion rate of approximately 0.02 mm/a in 6%FeCl3+1%HCl solution at 65℃.Compared with SEA-CURE steel,the experimental alloy exhibited significantly enhanced strength,elongation,and corrosion resistance through controlled Laves phase precipitation and optimized recrystallization annealing,indicating strong potential for practical applications. 展开更多
关键词 Super ferritic stainless steel Laves phase Recrystallization Mechanical property Corrosion performance
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Tuning recrystallization uniformity in TC18 alloy viaαconfiguration design 认领 引用
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作者 Jin-yang GE Shuang-xi SHI +4 位作者 Xiao-dong ZHAN Jing WANG Miao SONG Xiao-yong ZHANG Ke-chao ZHOU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第8期2310-2322,共13页
The effect ofαlamellae configuration on recrystallization uniformity in TC18 alloy was systematically investigated.The results indicated that with increasing the thickness ofαlamellae,theβgrain size uniformity fact... The effect ofαlamellae configuration on recrystallization uniformity in TC18 alloy was systematically investigated.The results indicated that with increasing the thickness ofαlamellae,theβgrain size uniformity factor(statistics standard deviation)exhibits a tendency of decreasing and then increasing.The mechanism of microstructural homogeneity regulation through the interplay betweenαdissolution andβrecrystallization nucleation and growth was elucidated.When theαlamellae are thin,βrecrystallization nucleation primarily occurs through grain boundary-induced boundary migration mechanism,characterized by unidirectional nucleation from high-strain to low-strain regions,resulting in excessive growth of certainβgrains.However,the thickαlamella results in asynchronous processes ofβrecrystallization nucleation and growth near the grain boundaries and within the grains,ultimately leading to deterioratedβgrain size uniformity. 展开更多
关键词 αconfiguration thermomechanical treatment recrystallization homogeneity TC18 alloy
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A straightforward 3D polycrystal plasticity finite element method for dynamic/static recrystallization simulation 认领 引用 被引量：1
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作者 Guowei Zhou Yuanzhe Hu +2 位作者 Ronghui Hu Peidong Wu Dayong Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第17期180-198,共19页
The microstructure and related property evolution induced by dynamic recrystallization(DRX)and static recrystallization(SRX)in thermo-mechanical process are two critical factors for the metal forming.The DRX and SRX a... The microstructure and related property evolution induced by dynamic recrystallization(DRX)and static recrystallization(SRX)in thermo-mechanical process are two critical factors for the metal forming.The DRX and SRX are determined by the grain level deformation and sequentially coupled.In order to fully capture the microstructure and mechanical property evolution,a crystal plasticity finite element based modelling method for DRX and SRX is proposed in the current work.The grain level deformation is calculated with crystal plasticity which is coupled with the recrystallization model straightforwardly,and both the grain deformation and microstructure evolution are updated simultaneously.The proposed method is validated with discontinuous DRX experiments and the effects of initial deformation conditions are well-captured.Two controversial mechanisms for recrystallization microstructure evolution,i.e.oriented nucleation and growth selection,are discussed in the current framework with the advantages of accurate grain level deformation and interaction predictions.Furthermore,the sequentially coupled DRX and SRX are modelled seamlessly in the current work which provides a critical method for fully integrated thermo-mechanical processes analysis. 展开更多
关键词 Dynamic recrystallization Static recrystallization Crystal plasticity finite element method Microstructure Growth selection
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Flow Behavior and Dynamic Recrystallization Mechanism of CSS‑42L Bearing Steel During Hot Compression Deformation 认领 引用 被引量：1
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作者 Tianyi Zeng Zirui Luo +2 位作者 Hao Chen Wei Wang Ke Yang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2025年第3期465-480,共16页
In this work,fow behavior and dynamic recrystallization(DRX)mechanism of a low carbon martensitic stainless bearing steel,CSS-42L,were investigated using a thermomechanical simulator under the temperature and strain r... In this work,fow behavior and dynamic recrystallization(DRX)mechanism of a low carbon martensitic stainless bearing steel,CSS-42L,were investigated using a thermomechanical simulator under the temperature and strain rate ranges of 900 to 1100℃ and 0.1 to 20 s−1,respectively.The Arrhenius-type constitutive equation was established based on the fow stress curves.Moreover,the peak stress decreased with the increase in deformation temperature and the decrease in strain rate.There were two DRX mechanisms during hot deformation of the current studied steel,the main one being discontinuous dynamic recrystallization mechanism,acting through grain boundary bulging and migration,and the auxiliary one being continuous dynamic recrystallization mechanism,working through the rotation of sub-grains.On the basis of microstructural characterizations,power dissipation maps and fow instability maps,the optimized hot deformation parameters for CSS-42L bearing steel were determined as 1050℃/0.1 s−1 and 1100℃/1 s−1. 展开更多
关键词 CSS-42L bearing steel Hot deformation Flow stress Constitutive equation Discontinuous dynamic recrystallization Continuous dynamic recrystallization
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A novel strategy for ingot cogging without homogenization:Dynamical recrystallization and nucleation mechanisms associated with as-cast dendrites of nickel-based superalloys 认领 引用 被引量：4
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作者 B.C.Xie Y.W.Luo +3 位作者 Z.T.Wang Q.Q.Meng Y.Q.Ning M.W.Fu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第17期78-91,共14页
Since the as-cast microstructure benefits dynamic recrystallization(DRX)nucleation,the present research is focused on the microstructure evolution associated with the dendrites and precipitates during the thermal defo... Since the as-cast microstructure benefits dynamic recrystallization(DRX)nucleation,the present research is focused on the microstructure evolution associated with the dendrites and precipitates during the thermal deformation of an ingot without homogenization treatment aiming at exploring a new efficient strategy of ingot cogging for superalloys.The as-cast samples were deformed at the sub-solvus temperature,and the DRX evolution from dendritic arms(DAs)to inter-dendritic regions(IDRs)was discussed based on the observation of the fishnet-like DRX microstructures and the gradient of DRX grain size at IDRs.The difference in the precipitates at DAs and IDRs played an essential role during the deformation and DRX process,which finally resulted in very different microstructures in the two areas.A selective straininduced grain boundary bulging(SIGBB)mechanism was found to function well and dominate the DRX nucleation at DAs.The grain boundary was able to migrate and bulge to nucleate on the condition that the boundary was located at DAs and had a great difference in dislocation density between its opposite sides at the same time.As for DRX nucleation at IDRs,the particle-stimulated nucleation(PSN)mechanism played a leading role,and the progressive subgrain rotation(PSR)and geometric DRX were two important supplementary mechanisms.The dislocation accumulation around the coarse precipitates at IDR resulted in progressive orientation rotation,which would generate DRX nuclei once the maximum misorientation there was sufficient to form a high-angle boundary with the matrix.The PSR or geometric DRX functioned at the severely elongated IDRs at the later stage of deformation,depending on the thickness of the elongated IDRs.The uniform microstructure was obtained by the deformation without homogenization and the subsequent annealing treatment.The smaller strain,the lower annealing temperature,and the much shorter soaking time requested in the above process lead to a smaller risk of cracking and a lower consumption of energy during the ingot-cogging process. 展开更多
关键词 Superalloys Ingot cogging Dendrites Dynamic recrystallization Nucleation mechanisms
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Interaction between dynamic recrystallization and phase transformation of Ti-43Al-4Nb-1Mo-0.2B alloy during hot deformation 认领 引用 被引量：3
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作者 Xiaofei Chen Bin Tang +5 位作者 Beibei Wei Wenxin Xu Biao Ma Jinhua Dai Guoming Zheng Jinshan Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第11期130-142,共13页
Theβsolidifiedγ-TiAl alloy holds important application value in the aerospace industry,while its com-plex phase compositions and geometric structures pose challenges to its microstructure control during the thermal-... Theβsolidifiedγ-TiAl alloy holds important application value in the aerospace industry,while its com-plex phase compositions and geometric structures pose challenges to its microstructure control during the thermal-mechanical process.The microstructure evolution of Ti-43Al-4Nb-1Mo-0.2B alloy at 1200℃/0.01 s−1 was investigated to clarify the coupling role of dynamic recrystallization(DRX)and phase transformation.The results revealed that the rate of DRX inα2+γlamellar colonies was comparatively slower than that inβo+γmixed structure,instead being accompanied by intense lamellar kinking and rotation.The initiation and development rates of DRX inα2,βo,andγphases decreased sequentially.The asynchronous DRX of the various geometric structures and phase compositions resulted in the un-even deformed microstructure,and the dynamic softening induced by lamellar kinking and rotation was replaced by strengthened DRX as strain increased.Additionally,the blockyα2 phase and the terminals ofα2 lamellae were the preferential DRX sites owing to the abundant activated slip systems.Theα2→βo transformation within lamellar colonies facilitated DRX and fragment ofα2 lamellae,while theα2→γtransformation promoted the decomposition ofα2 lamellae and DRX ofγlamellae.Moreover,the var-iedβo+γmixed structures underwent complicated evolution:(1)Theγ→βo transformation occurred at boundaries of lamellar colonies,followed by simultaneous DRX ofγlamellar terminals and neighboringβo phase;(2)DRX occurred earlier within the band-likeβo phase,with the delayed DRX in enclosedγphase;(3)DRX within theβo synapses and neighboringγphase was accelerated owing to generation of elastic stress field;(4)Dispersedβo particles triggered particle stimulated nucleation(PSN)ofγphase.Eventually,atomic diffusion along crystal defects inβo andγphases caused fracture of band-likeβo phase and formation of massiveβo particles,impeding grain boundary migration and hindering DRXed grain growth ofγphase. 展开更多
关键词 TiAl alloy Hot deformation Dynamic recrystallization Phase transformation
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Recrystallization aspects and factors affecting their roles in Mg alloys:A comprehensive review 认领 引用 被引量：2
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作者 S.S.A.Shah Manping Liu +6 位作者 Azim Khan Farooq Ahmad Umer Masood Chaudry Muhammad Yar Khan M.R.Abdullah Shiwei Xu Zhen Peng 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第5期1879-1914,共36页
Recrystallization stands as an essential process that influences the microstructure and properties of magnesium(Mg)alloys,yet its mechanisms remain complex and multifaceted.This review explores the key factors affecti... Recrystallization stands as an essential process that influences the microstructure and properties of magnesium(Mg)alloys,yet its mechanisms remain complex and multifaceted.This review explores the key factors affecting the recrystallization behavior of Mg alloys,emphasizing how their unique structural characteristics impact the driving forces and dynamics of recrystallization.Unlike conventional alloys,Mg alloys exhibit distinctive recrystallization kinetics,which is significantly affected by deformation conditions,such as strain rate,temperature,and processing methods(e.g.,rolling,forging,and extrusion).The process is also influenced by material characteristics,including initial grain size,texture,dislocation density,solute clustering,and stacking fault energy.Additionally,uneven strain distribution,stress concentrations,and stored energy play crucial roles in shaping the formation of recrystallized grains,particularly near grain boundaries.Notably,recrystallization is driven by dislocation accumulation and the availability of slip systems,with new strain-free grains typically forming in regions of high dislocation density.This paper synthesizes the existing literature to provide a comprehensive understanding of the mechanisms and kinetics of recrystallization in Mg alloys,highlighting the influence of microstructural features such as second-phase particles and grain boundary characteristics.It also identifies key challenges and suggests promising directions for future research,including optimizing material compositions and the interaction between deformation conditions via machine learning. 展开更多
关键词 Mg alloys Recrystallization Microstructural evolution Influencing factors Grain refinement Twinning
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Dynamic recovery and recrystallization of an as-cast SX superalloy during hot deformation 认领 引用 被引量：2
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作者 Yihang Li Zhipeng Jiang +3 位作者 Longfei Li Guang Xie Jian Zhang Qiang Feng 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第14期296-310,共15页
The plastic deformation introduced during the cooling stage(above 1000℃)of directional solidification is one of the primary reasons for the recrystallization of Ni-based single-crystal(SX)turbine blades in aeroengine... The plastic deformation introduced during the cooling stage(above 1000℃)of directional solidification is one of the primary reasons for the recrystallization of Ni-based single-crystal(SX)turbine blades in aeroengines during subsequent heat treatment.An as-cast SX superalloy DD33 was compressed at 1200°C with a Gleeble thermo-mechanical simulator to mimic such deformation.The microstructural evolution,dynamic recovery,and dynamic recrystallization nucleation of the as-cast SX superalloy during hot deformation are investigated.The results show that the highest stored energy occurs in the vicinity of the eutectics,and its energy in the interdendritic regions is higher than that in the dendrite cores/arms.The formation of deformation bands and related transition bands near the eutectics are the primary characteristics of microstructural evolution during hot deformation.The dynamic recovery in the eutectic regions includes the entanglement and annihilation of dislocations at eutectic/matrix interface,within nearby γ matrix or within the eutectic γ′phase,as well as the formation of dense dislocation networks in these sites.Subsequently,the low-angle grain boundaries in the transition bands migrate,merge,and finally transform into high-angle grain boundaries.In other words,the recrystallized grains nucleate near the eutectics via subgrain growth.In contrast,the dislocations only tangle and annihilate at the γ/γ′ interfaces in other interdendritic regions and the dendrite cores/arms without initiating recrystallization under moderate plastic deformation(εplastic=11.9%).This study will be helpful for understanding the local microstructural evolution of SX superalloys during directional solidification,as well as the recovery and recrystallization nucleation during the subsequent annealing. 展开更多
关键词 Single-crystal superalloy Hot deformation Recovery Recrystallization
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Understanding pyramidal slip-induced deformation bands and dynamic recrystallization in AZWX3100 magnesium alloy 认领 引用 被引量：1
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作者 Risheng Pei Fatim-Zahra Mouhib +3 位作者 Mattis Seehaus Simon Arnoldi Pei-Ling Sun Talal Al-Samman 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第3期1088-1098,共11页
Dynamic recrystallization(DRX)in inhomogeneous deformation zones,such as grain boundaries,shear bands,and deformation bands,is critical for texture modification in magnesium alloys during deformation at elevated temper... Dynamic recrystallization(DRX)in inhomogeneous deformation zones,such as grain boundaries,shear bands,and deformation bands,is critical for texture modification in magnesium alloys during deformation at elevated temperatures.This study investigates the DRX mechanisms in AZWX3100 magnesium alloy under plane strain compression at 200℃.Microstructural analysis revealed necklace-type DRX accompanied by evidence of local grain boundary bulging.Additionally,ribbons of recrystallized grains were observed withinfine deformation bands,aligned with theoretical pyramidal I and II slip traces derived from the matrix.The distribution of local misorientation within the deformed microstructure demonstrated a clear association between deformation bands and localized strain.Dislocation analysis of lamellar specimens extracted from two pyramidal slip bands revealeddislocations,indicating a connection betweenslip activation and the formation of deformation bands.Crystal plasticity simulations suggest that the orientation of deformation bands is responsible for the unique recrystallization texture of the DRX grains within these bands.The texture characteristics imply a progressive,glide-induced DRX mechanism.A fundamental understanding of the role of deformation bands in texture modification can facilitate future alloy and process design. 展开更多
关键词 Magnesium Channel die Dynamic recrystallization Texture modification Pyramidal slip
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Influence of dynamic recrystallization mechanisms on the texture evolution of GH 4706 alloy during hot deformation 认领 引用 被引量：1
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作者 XIA Yu-feng DU Xiao +4 位作者 SUN Fen ZHENG De-yu ZOU Hao-nan ZENG Yang YANG Wen-bin 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第10期3675-3692,共18页
In this study,the hot deformation behavior and microstructural evolution of the GH 4706 alloy under various thermal processing parameters(TPPs)were investigated through hot deformation experiments and electron backsca... In this study,the hot deformation behavior and microstructural evolution of the GH 4706 alloy under various thermal processing parameters(TPPs)were investigated through hot deformation experiments and electron backscatter diffraction(EBSD)microstructural characterization.The findings suggest that increasing hot compression temperature(T)and reducing strain rate(ε)enhance the degree of dynamic recrystallization(DRX),significantly reducing flow stress and weakening texture intensity.Increasing strain(ε)promotes DRX,with the overall texture strength initially increasing before decreasing.During hot compression at 1000−1100℃,discontinuous dynamic recrystallization(DDRX),continuous dynamic recrystallization(CDRX),and twin-induced dynamic recrystallization(TDRX)jointly influence texture development.Among these,DDRX plays a dominant role,with numerous DDRX grains exhibiting dispersed orientations,significantly contributing to texture weakening.The CDRX mechanism induces a limited number of randomly oriented grains within the deformed grains,and its contribution to texture weakening is enhanced with increasingεand decreasing T.The TDRX mechanism generates DRX grains withinΣ3 twin boundaries deviating from their theoretical orientation,and these grains inherit the twin orientation,exerting a limited effect on texture weakening.These findings provide a theoretical foundation for a deeper understanding of DRX behavior and texture evolution in the GH 4706 during hot working. 展开更多
关键词 GH4706 alloy dynamic recrystallization mechanism hot deformation parameters texture evolution microstructure
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