Influence of Ta Content on Prior Particle Boundary Precipitation in the as-HIPed Powder Metallurgy Superalloy
Powder metallurgy(PM)has become increasingly attractive as a processing technique for advanced nickelbased superalloys.Prior particle boundary(PPB)is one of the main potential defects in the as-HIPed PM superalloys,which weakened the metallurgy connection between powders.In FGH4098 alloy without Ta,there is a large number of PPB.PPB is mainly composed of MC type carbides,which is rich in Ti and Nb.With the increase of Ta content,the(Ti,Nb)C will transform into(Ta,Ti,Nb)C,and the problem of PPB is solved.(Ta,Ti,Nb)C is mainly precipitated inside the powder particles and not along the powder surface.Due to the smaller diffusion coefficient of Ta than Ti and C,carbides with Ta are difficult to diffuse to the surface of the powder during HIP,which helps to inhibit the generation of PBB.
PM superalloy FGH4098 Ta PPB
Jia Jian Liu Zhiyuan Zhang Yiwen Xing Pengyu
High Temperature Materials Research Institute,China Iron & Steel Research Institute Group,Beijing 10 AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China
国际会议
北京
英文
1084-1087
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）