Effect of heat treatment on microstructure and high temperature tensile properties of cast nickel-base superalloy with high W,Mo and Nb cont ents
来源期刊：中国有色金属学报(英文版)2002年第1期
论文作者：殷凤仕 孙晓峰 袁超 管恒荣 胡壮麒
文章页码：83 - 87
Key words：cast nickel base super alloy;mechanical properties; microstructure; heat treatment
Abstract: The microstructural features and high temperature tensile properties of M963 superalloy at as-cast, as-solutioned and as-aged conditions were investigated in detail. The results show that the solution treatment at 1220℃ for 4h,AC causes an increase in high temperature yield strength but a drastic drop in high temperature ductility due to the precipitation of both the secondary carbide M6C along grain boundaries and at the interdendritic regions and very fine γ′ particles in the dendrite cores. Aging treatment following the solution treatment can improve the high temperature tensile properties of M963 super alloy due to the coarsing of the γ′ precipitate. One stage aging at 850℃ for 16h following the solution treatment causes an increase in both strength and ductility of alloy M963, and two-stage aging of 1089℃/2h,AC plus 850℃/16h, AC following the solution treatment further increases the ductility of alloy M963 but slightly decreases its strength.
