高温合金由于其优异的综合高温性能被应用于航空发动机、燃气轮机等热端部件的制造,随着装备设计对材料服役温度要求的日益提高,对高温合金的综合性能要求越来越严苛,具有更加优异性能的改型合金不断诞生。以我国某新型重型燃气轮机大...高温合金由于其优异的综合高温性能被应用于航空发动机、燃气轮机等热端部件的制造,随着装备设计对材料服役温度要求的日益提高,对高温合金的综合性能要求越来越严苛,具有更加优异性能的改型合金不断诞生。以我国某新型重型燃气轮机大尺寸定向柱晶空心透平叶片用改型合金DZ411G为研究对象,借助相图计算软件JmatPro,通过热力学计算分析了C,Al,Ti,Cr,Ta等元素对主要合金相的开始析出温度、最大析出量、固液相线、γ/γ′错配度等的影响规律,为DZ411G合金化学成分优化、熔炼配入点设计及热处理工艺制定提供了依据。根据理论计算结果,设计了合理的配入点,并首次完成了2.5 t DZ411G母合金的工业化生产。展开更多
Compared with the conventional Charpy impact test method,the oscillographic impact test can help in the behavioral analysis of materials during the fracture process.In this study,the trade-off relationship between the...Compared with the conventional Charpy impact test method,the oscillographic impact test can help in the behavioral analysis of materials during the fracture process.In this study,the trade-off relationship between the strength and toughness of a DZ2 axle steel at various tempering temperatures and the cause of the improvement in impact toughness was evaluated.The tempering process dramatically influenced carbide precipitation behavior,which resulted in different aspect ratios of carbides.Impact toughness improved along with the rise in tempering temperature mainly due to the increase in energy required in impact crack propagation.The characteristics of the impact crack propagation process were studied through a comprehensive analysis of stress distribution,oscilloscopic impact statistics,fracture morphology,and carbide morphology.The poor impact toughness of low-tempering-temperature specimens was attributed to the increased number of stress concentration points caused by carbide morphology in the small plastic zone during the propagation process,which resulted in a mixed distribution of brittle and ductile fractures on the fracture surface.展开更多
文摘高温合金由于其优异的综合高温性能被应用于航空发动机、燃气轮机等热端部件的制造,随着装备设计对材料服役温度要求的日益提高,对高温合金的综合性能要求越来越严苛,具有更加优异性能的改型合金不断诞生。以我国某新型重型燃气轮机大尺寸定向柱晶空心透平叶片用改型合金DZ411G为研究对象,借助相图计算软件JmatPro,通过热力学计算分析了C,Al,Ti,Cr,Ta等元素对主要合金相的开始析出温度、最大析出量、固液相线、γ/γ′错配度等的影响规律,为DZ411G合金化学成分优化、熔炼配入点设计及热处理工艺制定提供了依据。根据理论计算结果,设计了合理的配入点,并首次完成了2.5 t DZ411G母合金的工业化生产。
基金the National Natural Science Foundation of China(Nos.52001310 and 52130002)the National Science and Technology Major Project(No.J2019-VI-0019-0134)+1 种基金KC Wong Education Foundation(No.GJTD-2020-09)Institute of Metal Res earch Innovation Fund(No.2023-ZD01)。
文摘Compared with the conventional Charpy impact test method,the oscillographic impact test can help in the behavioral analysis of materials during the fracture process.In this study,the trade-off relationship between the strength and toughness of a DZ2 axle steel at various tempering temperatures and the cause of the improvement in impact toughness was evaluated.The tempering process dramatically influenced carbide precipitation behavior,which resulted in different aspect ratios of carbides.Impact toughness improved along with the rise in tempering temperature mainly due to the increase in energy required in impact crack propagation.The characteristics of the impact crack propagation process were studied through a comprehensive analysis of stress distribution,oscilloscopic impact statistics,fracture morphology,and carbide morphology.The poor impact toughness of low-tempering-temperature specimens was attributed to the increased number of stress concentration points caused by carbide morphology in the small plastic zone during the propagation process,which resulted in a mixed distribution of brittle and ductile fractures on the fracture surface.
