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Stress-rupture behavior of a Ni-based Re-containing single crystal superalloy in[001]and[111]orientations at 1100℃ 认领 引用 被引量：1
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作者 Guang-lei Wang Dong-qing Qi +1 位作者 Jin-lai Liu Ji-de Liu 《China Foundry》 SCIE EI CAS CSCD 2026年第2期179-185,共7页
Turbine blades,due to their intricate geometry,are exposed to multiaxial stresses during operation.Consequently,it is imperative to examine the anisotropy of their stress-rupture behavior across various testing scenar... Turbine blades,due to their intricate geometry,are exposed to multiaxial stresses during operation.Consequently,it is imperative to examine the anisotropy of their stress-rupture behavior across various testing scenarios,particularly under high-temperature conditions.Stress-rupture behavior of a Ni-based single crystal superalloy was investigated under a load varying from 100 MPa to 137 MPa at 1,100℃ for both[001]-and[111]-orientated specimens.Results demonstrate that the rupture behavior of[111]-orientated specimens exhibits obviously higher sensitive to applied stress compared to[001]-orientated specimens.This difference is primarily attributed to the orientation dependentγ'coarsening behavior and distinct dislocation interactions atγ/γ'interfaces.In[001]-oriented specimens,plate-likeγ/γ'rafts rapidly form alongside well-developed interfacial dislocation networks,where theγ/γ'misfit stress dominates the microstructural evolution.In contrast,the[111]-orientated specimens exhibit retained,coarsenedγ'precipitates embedded within theγmatrix,accompanied by poorly developed interfacial dislocation networks. 展开更多
关键词 Ni-based single crystal superalloy stress-rupture behavior deformation mechanism stress dependence orientation dependence
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Stray grains evolution and high-temperature stress rupture behavior of crystallographic lamellar microstructure in Ni-based superalloys prepared by laser powder bed fusion 认领 引用
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作者 Peng Wang Jing-jing Liang +10 位作者 Yu-ping Zhu Wei Song Qiao-lei Li Yi Qiu Ying-ju Li Yi-zhou Zhou Han-lin Liao Lei Shi Li-ming Lei Xiao-feng Sun Jin-guo Li 《China Foundry》 SCIE EI CAS CSCD 2026年第1期45-54,共10页
The unique crystallographic lamellar microstructure(CLM) Ni-based superalloys fabricated by laser powder bed fusion(LPBF) exhibits excellent tensile properties.This study aims to investigate CLM's high-temperature... The unique crystallographic lamellar microstructure(CLM) Ni-based superalloys fabricated by laser powder bed fusion(LPBF) exhibits excellent tensile properties.This study aims to investigate CLM's high-temperature stress rupture behavior and use these findings to improve the additive manufacturing process.The result shows that the high temperature-induced intergranular fracture in grain region is responsible for stress rupture failure under both conditions of 760 ℃/780 MPa and 980 ℃/260 MPa.Among them,the sub-grain boundary fracture occurs only under high temperature and low stress,980 ℃/260 MPa.Due to the severe intergranular fracture induced by stray grains,the stress rupture life is very low under both conditions.According to the finite element simulation,the formation of stray grains stems from the unstable heat flow within the melt pool during the process.In addition,the shorter stress rupture lifetime does not excite a more pronounced dislocation network around the γ′ phase.However,the deformation twins can still be activated inside the grains,so it has excellent plasticity under both test conditions.Finally,this work indicates that the future optimization of CLM by LPBF should focus on eliminating of high-angle grain boundaries in grains. 展开更多
关键词 crystallographic lamellar microstructure Ni-based superalloys additive manufacturing mechanical properties
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Characteristics and formation mechanism of non-metallic inclusion clusters in vacuum arc remelted Ni-based superalloys 认领 引用
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作者 Yu Gu Kai-Xuan Gui +1 位作者 Peng Zhao Shu-Feng Yang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第5期18-32,共15页
A quantitative study of inclusions in an industrial superalloy ingot produced by vacuum arc remelting(VAR)was conducted,and the characteristics as well as the formation mechanism of non-metallic inclusion clusters wer... A quantitative study of inclusions in an industrial superalloy ingot produced by vacuum arc remelting(VAR)was conducted,and the characteristics as well as the formation mechanism of non-metallic inclusion clusters were discussed.Results showed that inclusions within the VAR ingot primarily consisted of individual nitrides and composite inclusions such as oxide-nitrides.The quantity density of individual inclusions increases radially from the center to the edge of the ingot,while decreasing axially from the top to the bottom,with the average size gradually decreasing in both radial and axial directions.Clustered inclusions were identified in the subsurface regions(2-10 mm in depth)and sidewall surfaces of the ingot.The formation mechanism and distribution characteristics of clustered inclusions during the VAR process were studied by combining in-situ high-temperature laser confocal microscopy observation and numerical analysis.In-situ observations confirm that larger inclusions lead to reduced critical aggregation distance,while smaller spacing enhances attraction and promotes cluster formation.The cavity bridge force between inclusions is significantly greater than the capillary force and van der Waals force,serving as the primary force responsible for the aggregation of inclusions.Numerical analysis reveals that inclusions within the VAR melt pool exhibit typical flow-following behavior and size effects,with their trajectory leading to preferential accumulation patterns along both the sidewall and subsurface regions,thereby facilitating cluster formation through particle agglomeration. 展开更多
关键词 Inclusion cluster Formation mechanism Aggregation behavior Ni-based superalloy Vacuum arc remelting
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Lattice misfit strain regulating kinetics and creep properties of multi-component Ni-based superalloy 认领 引用
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作者 Ye SHAN Sheng-long WANG +3 位作者 Hai-wei ZHANG Zan ZHANG Peng SANG Yong-sheng LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第7期2065-2079,共15页
A crystal plasticity theory was coupled with a phase-field model to investigate the regulating effect of initial lattice misfits on the kinetics evolution and creep properties of Ni-based superalloys.The quantitative ... A crystal plasticity theory was coupled with a phase-field model to investigate the regulating effect of initial lattice misfits on the kinetics evolution and creep properties of Ni-based superalloys.The quantitative characteristics of theγʹ-(Ni,Co)3(Al,Ta)phase,including morphology,particle size,element partitioning,rafting fracture,and plastic strain evolution,were systematically elucidated in a model Ni−12.2Al−6Co−2.5Ta(at.%)superalloy at 1273 K.The results reveal that reducing the initial lattice misfit between theγandγʹphases promotes the partitioning of Al and Ta into theγmatrix and Ni into theγʹphase,resulting in a higherγʹvolume fraction and slower coarsening rate in the alloys.Theγʹphase undergoes coalescence and coarsening at the primary creep stage,and dissolution and fracture at the secondary creep stage.Alloys with larger initial lattice misfit exhibit higher creep strain,faster raft degradation,and shorter creep life.These findings provide insights for designing high-performance superalloys by optimizing lattice misfits. 展开更多
关键词 Ni-based superalloy initial lattice misfit creep properties plasticity phase-field simulation
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Progress in stress-relieving methodologies of ceramic matrix composites/Ni-based superalloys joints:A review 认领 引用
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作者 Ying-xin WANG Fu WANG +4 位作者 Qiang YANG Di-chen LI Zai-wang HUANG Yun-song ZHAO Jian-tao WU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第6期1685-1711,共27页
Ceramic matrix composites(CMCs)are regarded as promising high-temperature materials for industrial applications due to their exceptional properties at elevated temperatures.However,their limited manufacturability rest... Ceramic matrix composites(CMCs)are regarded as promising high-temperature materials for industrial applications due to their exceptional properties at elevated temperatures.However,their limited manufacturability restricts their capability to be produced as complex,large-scale structural components.Ni-based superalloys are well-known for their outstanding performance under high-temperature conditions.The integration of these two material types to create hybrid components can significantly broaden their applications in engineering.A critical challenge arises from the interfacial residual stresses that develop at the joints of CMCs and Ni-based superalloys,which can severely impair the performance of the hybrid components.The mechanisms behind the formation of residual stress in CMCs/Ni-based superalloys joints are reviewed,including thermal expansion coefficient(CTE)mismatch,thermal gradient difference,and phase transformation,and various methodologies for alleviating these stresses are summarized,including interlayer techniques,composite filler approaches,and interface structure design strategies.Finally,the challenges and future trends in mitigating interfacial stress in CMCs/Ni-based superalloys joints are discussed. 展开更多
关键词 ceramic matrix composites Ni-based superalloy joining residual stress relieving methodologies
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Hot deformation behavior and microstructural evolution of a Ni-based wrought superalloy based on 3D hot processing maps 认领 引用
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作者 Wen-Peng Li Guang-Lei Wang +2 位作者 Hua Zhang Jing-Long Qu Jin-Hui Du 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第4期1-16,共16页
Uniaxial compression tests and microstructural analyses were performed on a Ni-based wrought superalloy across a temperature range spanning the γ + γ′ duplex-phase region (below the γ′ solvus) and the γ single-p... Uniaxial compression tests and microstructural analyses were performed on a Ni-based wrought superalloy across a temperature range spanning the γ + γ′ duplex-phase region (below the γ′ solvus) and the γ single-phase region (above the γ′ solvus). Analysis of the flow stress curves using an Arrhenius constitutive equation revealed that the activation energy for dynamic recrystallization (DRX) is significantly higher in the duplex-phase region than in the single-phase region. A three-dimensional hot processing map was developed to delineate the influence of temperature, strain rate, and strain on the alloy’s workability. The results also indicated that rapid flow softening at low temperatures (950-980 ℃) and a high strain rate (1 s−1) is attributable to processing instability. During deformation in the γ + γ′ duplex region, both discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) mechanisms were active, with DDRX becoming the dominant mechanism at higher temperatures. Initially, the dispersed γ′ precipitates retard DRX. However, these precipitates subsequently dissolve and re-precipitate along DRX grain boundaries as nano- to micro-scale particles, which effectively pin the boundaries and inhibit grain growth. 展开更多
关键词 Ni-based wrought superalloy Hot deformation behavior Constitutive model 3D hot processing map Dynamic recrystallization
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Formation mechanism of film-like spinel inclusions in Ni-based superalloys from MgO crucible reaction 认领 引用
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作者 Wen-jin Wu Feng-wei Guo +4 位作者 Wei-jie Xing Li-hui Zhang Min Xia Xiao-dong Ren Lei Qian 《China Foundry》 SCIE EI CAS CSCD 2026年第4期591-598,共8页
Film-like MgAl2O4 spinel inclusions are among the most harmful oxide defects in Ni-based superalloys because their high aspect ratio exacerbates local stress concentration.In this work,K492M Ni-based superalloy ... Film-like MgAl2O4 spinel inclusions are among the most harmful oxide defects in Ni-based superalloys because their high aspect ratio exacerbates local stress concentration.In this work,K492M Ni-based superalloy was remelted and cast in a MgO-containing crucible using a vacuum induction furnace to clarify the origin and formation pathway of Mg-,Al-,and O-bearing inclusions.Scanning electron microscopy,transmission electron microscopy,energy-dispersive spectroscopy,and selected-area electron diffraction were used to characterize the morphology,composition,and crystal structure of the inclusions.The results show that the inclusions consist mainly of particulate MgO cores directly coated by MgAl2O4 shells,together with flocculent film-like MgAl2O4products extending outward from the cores.Only local residualα-Al2O3 is detected,indicating that Al2O3 is a transient intermediate rather than a stable final product.Based on these observations,a three-stage mechanism is proposed:mechanical spallation of MgO particles from the crucible wall,rapid interfacial reduction coupled with solid-state transformation to form MgAl2O4,and stress-induced rupture and exfoliation of the spinel shell into thin films.This mechanism explains the coexistence of MgO-MgAl2O4 core-shell particles and film-like spinel inclusions,and provides guidance for controlling crucible-derived oxide contamination in Ni-based superalloy castings. 展开更多
关键词 K492M alloy Ni-based superalloy vacuum induction remelting MgO crucible MgAl2O4spinel film-like inclusion interfacial reaction
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Thermal fatigue behavior of the ZGH451 Ni-based superalloy fabricated by direct energy deposition in the temperature range of 900-1100℃ 认领 引用 被引量：3
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作者 Jiawang Chen Wei Song +4 位作者 Yanhong Yang Jingjing Liang Yizhou Zhou Xiaofeng Sun Jinguo Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第7期121-137,共17页
In this study,a novel Ni-based superalloy,ZGH451,has been fabricated using direct energy deposition(DED).The thermal fatigue resistance of ZGH451 is systematically evaluated at 900,1000,and 1100℃,primarily focusing o... In this study,a novel Ni-based superalloy,ZGH451,has been fabricated using direct energy deposition(DED).The thermal fatigue resistance of ZGH451 is systematically evaluated at 900,1000,and 1100℃,primarily focusing on the crack initiation and propagation behaviors.The results indicate that higher peak temperatures lead to earlier initiation and more rapid propagation of cracks.Cracks are initiated at the defects and grain boundaries in the vicinity of the notch,and different crack propagation mecha-nisms(γ'phase slip shearing,γ'phase distortion shearing,andγ'phase rafting shearing at 900,1000,and 1100℃,respectively)are the main reason for the different cracks propagation behaviors under the three temperatures.The main crack propagation paths are oriented at approximately 45°with respect to the build direction,suggesting activation of the{111}slip system.Additionally,oxidation reduces the matrix strength and passivates the crack tips,leading to varying rates of crack propagation.At ele-vated temperatures,the synergistic effects of thermal stress and oxidative erosion are found to be the primary damage mechanisms of thermal fatigue.Overall,the proposed ZGH451 superalloy demonstrates exceptional thermal fatigue resistance,providing a crucial experimental reference for thermal fatigue in additively manufactured superalloys. 展开更多
关键词 Direct energy deposition Thermal fatigue Crack initiation and propagation Ni-based superalloy
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Omnidirectional simulation analysis of thermomechanical coupling mechanism in inertia friction welding of Ni-based superalloy 认领 引用 被引量：4
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作者 Chang-an LI Guoliang QIN Hao WANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第1期202-216,共15页
The coupling between heat and pressure is the kernel of inertia friction welding(IFW)and is still not fully understood.A novel 3D fully coupled finite element model based on a plastic friction pair was developed to si... The coupling between heat and pressure is the kernel of inertia friction welding(IFW)and is still not fully understood.A novel 3D fully coupled finite element model based on a plastic friction pair was developed to simulate the IFW process of a Ni-based superalloy and reveal the omnidirectional thermo-mechanical coupling mechanism of the friction interface.The numerical model successfully simulated the deceleration,deformation processes,and peak torsional moments in IFW and captured the evolution of temperature,contact pressure,and stress.The simulated results were validated through measured thermal history,optical macrography,and axial shortening.The results indicated that interfacial friction heat was the primary heat source,and plastic deformation energy only accounted for 4%of the total.The increase in initial rotational speed and friction pressure elevated the peak temperature,reaching a maximum of 1525.5K at an initial rotational speed of 2000 r/min and friction pressure of 400 MPa.The interface heat generation could form an axial temperature gradient exceeding 320K/mm.The radial inhomogeneities of heat generation and temperature were manifested in a concentric ring distribution with maximum heat flux and temperature ranging from 2/5 to 2/3 radius.The radial inhomogeneities were caused by increasing linear velocity along the radius and an opposite distribution of contact pressure,which could reach 1.7 times the set pressure at the center.The circumferential inhomogeneity of thermomechanical distribution during rotary friction welding was revealed for the first time,benefiting from the 3D model.The deflection and transformation of distribution in contact pressure and Mises stress were indicators of plastic deformation and transition of quasi-steady state welding.The critical Mises stress was 0.5 times the friction pressure in this study.The presented modeling provides a reliable insight into the thermo-mechanical coupling mechanism of IFW and lays a solid foundation for predicting the microstructures and mechanical properties of inertia friction welded joints. 展开更多
关键词 Inertia friction welding Thermo-mechanical coupling Inhomogeneity Numerical simulation Ni-based superalloy
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Multi-objective optimisation and verification of creep-resistant Ni-base superalloy for electron-beam powder-bed-fusion 认领 引用 被引量：2
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作者 Shen Tao Yansong Li +2 位作者 Hui Peng Hongbo Guo Bo Chen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第18期84-101,共18页
This paper reports the use of integrated computational alloy design,coupled with a rapid printability screening method,to downselect from a total of 70000 datasets in design space to five candidates in the first step,... This paper reports the use of integrated computational alloy design,coupled with a rapid printability screening method,to downselect from a total of 70000 datasets in design space to five candidates in the first step,and then from five to one in the second step.The new Ni-base superalloy with compositions of Ni-5.03Al-2.69Co-5.63Cr-0.04Hf-1.91Mo-2.36Re-3.32Ta-0.57Ti-8.46W-0.05C-0.019B exhibits an optimal balance of density(8.82 g/cm2),printability(freezing range of 107℃),thermal stability(γ′-volume fraction of 50.7%at 980℃and low Mdvalue)and creep(rupture time of 612 h at 980℃/120 MPa).The micro-hardness varies mildly from 417.2±18.5 to 434.7±14.6 HV,suggesting good phase stability.This is substantiated by microstructure observations,which revealed the absence of a topologically close-packed phase.Machine-learning tools of the artificial neural network(ANN),random forest,and support vector regression,respectively,were used to predict creep rupture time.The ANN algorithm achieves the highest accuracy in predicting creep life.By recognising the“black box”nature of the ANN,interpretability analysis was conducted using the local interpretable model-agnostic method.The analysis supports that the ANN model truly learned meaningful functional relationships,and thus is judged as reliable.Feature correlation evaluation outcome emphasises the importance of incorporating microstructure-related input features. 展开更多
关键词 Alloy design Ni-base superalloys Additive manufacturing Machine learning Creep
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Effect of Hf and Ta on creep deformation behaviors of PM Ni-based superalloys 认领 引用 被引量：2
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作者 Hao-peng ZHANG Jia-ming BAI +4 位作者 Xin-yu LI Xiao-kun LI Jian JIA Jian-tao LIU Yi-wen ZHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第3期849-862,共14页
Four powder metallurgy(PM)Ni-based superalloys with different Hf and Ta contents were creep-tested at 650℃ and 970 MPa,700℃ and 770 MPa,and 750℃ and 580 MPa,respectively.The effect of Hf and Ta on creep deformation... Four powder metallurgy(PM)Ni-based superalloys with different Hf and Ta contents were creep-tested at 650℃ and 970 MPa,700℃ and 770 MPa,and 750℃ and 580 MPa,respectively.The effect of Hf and Ta on creep deformation behaviors of the superalloys was studied from multiple scales by SEM,electron backscatter diffraction(EBSD),and aberration-corrected scanning transmission electron microscope(AC-STEM).The results showed that Hf and Ta suppressed the intergranular fracture and initiation of cracks during the acceleration creep stage,which prolonged the creep rupture time.Hf and Ta inhibited the stacking faults extending and the dislocation climbing and promoted the Suzuki segregation of W during the steady-state creep stage,which reduced the minimum creep rate and delayed the start time of the acceleration creep stage.The Suzuki segregation of Co,Cr,Mo,Ti,Nb,W,and Ta along stacking faults was observed after Hf and Ta addition,leading to the localized phase transformation in the γ′phase,and the stacking fault phase was chemically disordered.This study provided ideas for the composition design of novel PM Ni-based superalloys and theoretical foundations for the combined addition of Hf and Ta. 展开更多
关键词 PM Ni-based superalloy Hf Ta creep deformation behaviors Suzuki segregation
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A new strategy for preparing high strength diffusion-bonded Ni-based superalloy joints at ultra-low temperature via surface nanocrystallization and spark plasma sintering 认领 引用 被引量：1
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作者 Tong Wu Ce Wang +5 位作者 Yuyuan Liu Qiuguang Zhang Panpan Lin Xin Yue Tiesong Lin Peng He 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第23期181-195,共15页
The challenge of low temperature and rapid diffusion bonding of a Ni-based superalloy was hereby addressed by using a Ni nano-coating and a spark plasma sintering(SPS).It successfully produced a Nibased superalloy joi... The challenge of low temperature and rapid diffusion bonding of a Ni-based superalloy was hereby addressed by using a Ni nano-coating and a spark plasma sintering(SPS).It successfully produced a Nibased superalloy joint with 337 MPa shear strength at 500℃ for 30 min,which is approximately 400℃ lower than the traditional hot pressure diffusion bonding(HPDB)temperature.The microstructure and mechanical properties of the joints were systematically investigated.It is revealed that the pulsed current and ultra-fine grains(19 nm)in the Ni nano-coating could significantly facilitate voids closure.The voids closure mechanisms involved(i)pulsed current strengthened plastic deformation,(ii)pulsed current strengthened surface source diffusion,(iii)pulsed current strengthened bonding interface diffusion,(iv)grain growth dividing the initial large voids into nano-voids,and(v)massive grain boundaries(GBs),lattice defects,and local high-temperature strengthened GBs diffusion.Furthermore,the GBs migration across the interface was investigated,and the results revealed that the GBs migration and fine grains(350 nm)near the bonding interface together increased the joint strength. 展开更多
关键词 Ni-based superalloy Diffusion bonding Surface nanocrystallization Spark plasma sintering
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Creep behavior of powder metallurgy Ni-based superalloys with minor scandium 认领 引用 被引量：1
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作者 Li-ming TAN Lin YE +6 位作者 Heng DONG Xiao-qiong OUYANG Xiang-you XIAO Qi ZENG Jing-wei CHEN Lan HUANG Feng LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第5期1585-1602,共18页
The creep behavior of two PM superalloys,U720Li and RR1000,each alloyed with trace amount of Sc,was systematically investigated.Findings reveal that RR1000 alloy with 0.064 wt.%Sc(R-0.064)demonstrates superior creep r... The creep behavior of two PM superalloys,U720Li and RR1000,each alloyed with trace amount of Sc,was systematically investigated.Findings reveal that RR1000 alloy with 0.064 wt.%Sc(R-0.064)demonstrates superior creep resistance compared to U720Li alloy with 0.043 wt.%Sc(U-0.043),at 650℃ and 1000 MPa,and the primary creep mechanisms in both alloys are identified as dislocation shearing and precipitate bypassing.When tested at 700℃ and 700 MPa,the U-0.043 alloy predominantly exhibits micro-twinning and dislocation bypassing,while the R-0.064 alloy engages in extended stacking fault shearing ofγ'precipitate,dislocation bypassing and climb.At 750℃ and 460 MPa,dislocation bypassing and climb emerge as the main creep mechanisms for both alloys. 展开更多
关键词 creep resistance Ni-based superalloy scandium powder metallurgy γ'precipitate
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Review on Rapid Alloying Design and Mechanical Properties Prediction of Ni-Based Superalloys Based on Machine Learning 认领 引用 被引量：1
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作者 Zhuangzhuang Li Qingshuang Ma +4 位作者 Dongxu Wang Linlin Sun Jing Bai Huijun Li Qiuzhi Gao 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2025年第11期1853-1872,共20页
Ni-based superalloys play a critical role in the aerospace industry due to their exceptional mechanical properties and oxidation resistance.However,the conventional development of new superalloys is often constrained ... Ni-based superalloys play a critical role in the aerospace industry due to their exceptional mechanical properties and oxidation resistance.However,the conventional development of new superalloys is often constrained by lengthy experimental cycles and high costs.To address these challenges,machine learning has emerged as an effective strategy for accelerating alloy design by efficiently exploring composition-property relationship,optimizing processing parameters,and enhancing predictive accuracy.This review summarizes recent progress in applying machine learning to composition optimization and mechanical property prediction of Ni-based superalloys,emphasizing the integration of theoretical modeling and experimental validation.The importance of feature engineering,including data collection,preprocessing,feature construction,and dimensionality reduction,was first highlighted.Subsequently,the machine learning approaches for novel alloy design and prediction of key properties including fatigue resistance,creep resistance,and oxidation resistance were discussed.Through data-driven approaches,machine learning not only enhances predictive capabilities but also uncovers complex composition-property relationship,which accelerates the development of next-generation Ni-based superalloys.We anticipate that the continued advancements in this field will drive more efficient and cost-effective alloy design,ultimately accelerating the transition from computational predictions to experimental realizations. 展开更多
关键词 Machine learning Ni-based superalloy Property predictions Composition design
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Integral casting of Ni-based superalloy melt and Nb-pretreated SiCf/SiC composite 认领 引用 被引量：1
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作者 Guo-biao LIN Fu-hu ZHU +2 位作者 Jing-yu LIU Peng LIU Kai-xuan CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第8期2652-2665,共14页
A practical process method for precise integration of SiCf/SiC composite(CMC)and a Ni-based superalloy(K403)was proposed in this study.It involves Nb coating pretreatment of the CMC via the chemical vapor depositio... A practical process method for precise integration of SiCf/SiC composite(CMC)and a Ni-based superalloy(K403)was proposed in this study.It involves Nb coating pretreatment of the CMC via the chemical vapor deposition(CVD)at 1000℃and subsequent integral precision casting between the pretreated CMC and the K403 superalloy melt.The method solves the difficulty for the dissimilar material to be cast together,forming a robust bonding interface with an average shear strength of 94.8 MPa at room temperature.During the pretreatment process,the Nb reacted with the CMC,forming a reactive coating with the microstructure composed of NbC,Nb2C and Nb5Si3 phases.In the following integral casting,the Nb reactive coating effectively blocked detrimental graphitization reaction between the Ni element in the superalloy melt and the CMC,and mitigated the interface thermal stress generated by both the mismatch of thermal expansion coefficients and temperature difference,resulting in the increase of interfacial strength.The typical interfacial microstructure consists of the CMC,NbC,NbSi2/NbC,SiC,NbSi2,Nb2C,Nb5Si3,Al4C3,Nb2Al/γ/γ'and MC(M=W,Mo,Ti).A formula for estimating the interfacial thermal stress of an integrated cast was derived. 展开更多
关键词 SiCf/SiC composite microstructure Ni-based superalloy integral casting Nb reactive coating bonding strength
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Effect of Carbon on the Microstructures and Stress Rupture Properties of a Polycrystalline Ni-Based Superalloy 认领 引用
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作者 Han Wang Shijie Sun +4 位作者 Naicheng Sheng Guichen Hou Jinguo Li Yizhou Zhou Xiaofeng Sun 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2025年第1期151-163,共13页
The effect of carbon content on the microstructures and stress rupture properties of a newly developed polycrystalline Ni-based superalloy with high Cr content has been studied.It was observed that both grain size and... The effect of carbon content on the microstructures and stress rupture properties of a newly developed polycrystalline Ni-based superalloy with high Cr content has been studied.It was observed that both grain size and the number of carbides increased with an increase in carbon content.After heat treatment,granular M23C6carbides were dispersed around MC carbides along grain boundaries and inside grains.The quantity of granular M23C6carbides increased while their sizes decreased.These findings can be verified with the results of thermodynamic calculation and differential scanning calorimetry analysis.The stress rupture times(975℃/225 MPa)increased from 13.3 to 25.5 h with the carbon content increased from 0.1 to 0.2 wt.%.The improvement can be attributed to two primary factors.Firstly,grain boundary is typically weak region during deformation process and the grain size increased as carbon content increased in the alloy.Secondly,carbides act as hindrances to impede dislocation movement,leading to dislocation entanglement.As carbon content rose,the quantity of carbides in interdendritic regions and grain boundaries increased,providing a certain degree of strengthening effect and resulting in a longer stress rupture time. 展开更多
关键词 Ni-based superalloy Microstructure Stress rupture property Carbon Carbide
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Surface dynamic reconstruction of Ni-based catalysts for electrooxidation reaction 认领 引用
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作者 Cheng Wang Li Zhou +2 位作者 Zhenghao Fei Yanqing Wang Yukou Du 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第12期137-151,共15页
Ni-based materials,widely recognized for their exceptional catalytic properties,experience structural transformations that profoundly influence their performance characteristics and operational stability.To deeply und... Ni-based materials,widely recognized for their exceptional catalytic properties,experience structural transformations that profoundly influence their performance characteristics and operational stability.To deeply understand the reconstruction mechanism of Ni-based catalysts,this review systematically summarizes the advanced strategies tailoring the dynamic reconstruction process,including electrochemical activation,defect engineering,partial etching,ionic doping,and heterostructure construction.Furthermore,we discuss the implications of these surface transformations on catalytic activity,highlighting their role in optimizing reaction pathways and enhancing overall efficiency in various electrooxidation reactions,such as oxygen evolution reaction(OER),urea oxidation reaction(UOR),glycerol oxidation reaction(GOR),hydroxymethylfurfural oxidation reaction(HMFOR),and ammonia oxidation reaction(AOR).By summarizing recent research findings,this review aims to provide a systematical summary of how surface dynamics can be harnessed to improve the design of Ni-based catalysts for a variety of electrooxidation applications,paving the way for advancements in energy conversion and storage technologies. 展开更多
关键词 Surface dynamic reconstruction Ni-based catalysts In situ Reconstruction strategies Electrooxidation
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Microstructure Evolution and Mechanical Properties of a Novel Low-Cost Second-Generation Ni-Based Single Crystal Superalloy After Long-Term Thermal Exposure 认领 引用
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作者 Chongwei Zhu Zhipeng Zhang +6 位作者 Jide Liu Jinchao Ma Jiajian Wang Wenying Zhang Xinguang Wang Yizhou Zhou Jinguo Li 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2025年第11期2035-2046,共12页
This study investigates the microstructural evolution of a novel low-cost second-generation Ni-based single crystal superalloy during long-term thermal exposure at different temperatures(982℃,1038℃,1093℃)and its im... This study investigates the microstructural evolution of a novel low-cost second-generation Ni-based single crystal superalloy during long-term thermal exposure at different temperatures(982℃,1038℃,1093℃)and its impact on the stress rupture properties of alloy.The results reveal that theγ′phase undergoes coarsening and rafting at high temperatures,and its growth behavior follows the Ostwald ripening mechanism.With the increase in aging temperature and extension of aging time,the coarsening rate of theγ′phase increases significantly.Particularly at 1093℃,theγ′phase undergoes the most pronounced growth,leading to a remarkable deterioration of its precipitation strengthening effect.Furthermore,under conditions of higher temperature and longer time,minor amounts of topologically close-packed(TCP)phase precipitate.As the aging temperature rises and time elapses,the precipitation tendency of the TCP phase shows a slight increase.The stress rupture testing at 1100℃/120 MPa demonstrates that the stress rupture life decreases significantly with the increase in thermal exposure temperature and time.This is mainly attributed to the diminished precipitation strengthening effect of theγ′phase and the deteriorating effect of the TCP phase.However,under the same conditions,the stress rupture properties of this alloy are comparable to those of the DD5 alloy.This research provides theoretical support for enhancing the service stability and reliability of single crystal turbine blades,and offers a reference for the development of cost-effective and highperformance turbine blade materials. 展开更多
关键词 Ni-based superalloys Thermal exposure Microstructure Stress rupture properties
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Effect of Withdrawal Rate on Non-uniform Distribution of Eutectic in Ni-based Single Crystal Superalloy Castings 认领 引用
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作者 Zhao Yunxing Yu Jingyi +1 位作者 Ma Dexin Huang Zaiwang 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第8期1934-1939,共6页
The microstructure of single crystal superalloy is relatively simple,consisting primarily ofγdendrites andγ/γ′eutectics.During the directional solidification process of Ni-based single crystal superalloys,withdraw... The microstructure of single crystal superalloy is relatively simple,consisting primarily ofγdendrites andγ/γ′eutectics.During the directional solidification process of Ni-based single crystal superalloys,withdrawal rate is a critical parameter affecting the spatial distribution ofγ/γ′eutectic along gravity direction.The results show that theγ/γ′eutectic fraction of the upper platform surface is always higher than that of the lower one,regardless of withdrawal rate.As the withdrawal rate decreases,there is a significant increase inγ/γ′eutectic fraction on the upper surface,while it decreases on the lower surface.The upward accumulation ofγ/γ′eutectic becomes more severe as the withdrawal rate decreases.It is also found that the percentage of Al+Ta is positively correlated with theγ/γ′eutectic fraction.Thermo-solute convection of Al and Ta solutes in the solidification front is the prime reason for the non-uniform distribution of eutectic.The non-uniform distribution ofγ/γ′eutectic cannot be eliminated even after subsequent solution heat treatment,resulting in excess eutectic on the upper surface and thus leading to the scrapping of the blade. 展开更多
关键词 Ni-based single crystal superalloy eutectics withdrawal rate thermo-solute convection
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Role of Cr addition in Ni-based interlayer on strengthening titanium and steel dissimilar bimetallic structures enabled by directed energy deposition with laser beam 认领 引用
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作者 Boshen Zhao Zhihao Ren +2 位作者 Hui Chang Zhengfei Zhou Yi Ding 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第6期27-42,共16页
For searching alternative strategies to improve reliability of titanium and steel dissimilar bimetallic joints manufactured by directed energy deposition with laser beam(DED-LB),pure titanium was considered as claddin... For searching alternative strategies to improve reliability of titanium and steel dissimilar bimetallic joints manufactured by directed energy deposition with laser beam(DED-LB),pure titanium was considered as cladding deposited on carbon steel substrate with Ni-based alloy interlayers in this work.Effect of different interlayer modification methods on the microstructure evolution and mechanical properties of joints was analyzed systematically.The distribution of intermetallic compounds(IMCs)such asβ-Ti,Ti2Ni,TiNiFe0.2,Ti2Ni3Si and TiB2in joints was revealed.The results showed that original deposition cracks caused by residual stress during processing could be alleviated by substrate preheating treatment while suppressed by the modified interlayer with Cr completely.Notably,additional Cr could reduce reaction activity between Ti and Ni atoms by raising laser molten pool liquidus,leading to fewer IMCs in joints.As a result,both bonding strength and toughness of joints were remarkably improved.The findings em-phasize more significance of optimizing Ni-based interlayer composition with Cr than preheating method to improve the mechanical performance of DED-LB joints. 展开更多
关键词 Dissimilar joints Directed energy deposition(DED) Intermetallic compounds Shear strength Ni-based interlayer
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