Tensile Deformation Mechanisms of Advanced High-Performance Nickel-based PM Superalloy
The microstructure and tensile deformation behavior of advanced high performance PM Nickel-base superalloy after heat treatment were studied.The microstructures were investigated using optical microscope(OM)and scanning electron microscope(SEM).Tensile testing was performed at 25℃ and 750℃ and the deformed samples were examined using SEM and transmission electron microscope(TEM).It was found that uniform grain structural is obtained after heat treatment,which has high strength and excellent ductility both at 25℃ and 750℃.The crack initiation was in a cleavage mode,and the crack propagation processed in a mixed mode which dominated by cleavage at both testing conditions.The area of shearing lip at 750℃ is larger than which at 25℃.It means that the toughness is better at 750℃.Dislocations sheared through the γ phase at room temperature and stacking fault formed in γ phase,whereas many deformation twinning and some stacking fault were found at 750℃.The deformation processes involving deformation twinning may enhance the strength and ductility of the alloy at 750℃.The deformation mechanisms are discussed.
PM Nickel-based Superalloy Deformation mechanisms Stacking fault Deformation twinning
Huang Hailiang Liu Guoquan Wang Hao Wang Zhicheng Zhu Xiaokun Hu Benfu
School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China
国际会议
北京
英文
1107-1113
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）