Precipitate coarsening and its effects on the hot deformation behavior of the recently developedγ’-strengthened superalloys  

作　　者：Yuting Wu Chong Li Xingchuan Xia Hongyan Liang Qiqi Qi Yongchang Liu 

机构地区：[1]State Key Lab of Hydraulic Engineering Simulation and Safety,School of Materials Science&Engineering,Tianjin University,Tianjin,300354,China [2]School of Material Science and Engineering,Hebei University of Technology,Tianjin,300130,China

出　　处：《Journal of Materials Science & Technology》2021年第8期95-104,共10页材料科学技术（英文版）

基　　金：supported financially by the National Natural Science Foundation of China(Nos.51474156,U1660201);the National High Technology Research and Development Program of China(No.2015AA042504)。

摘　　要：Recently,theγ’-strengthened superalloys are of great interests in high temperature applications due to their excellent high temperature strength which is derived from theγ’strengthening phase.For theseγ’-strengthened superalloys,the changes in morphology,size and distribution ofγ’precipitates due to coarsening during thermal exposure have a significant impact on the properties of alloys.This article briefly summarizes the recent advances on the coarsening behavior of gamma prime precipitates in the recently-developedγ’-strengthened superalloys and its effects on the hot deformation behavior of superalloys,drawing specific examples on Allvac^(■)718 Plus TM and Ni3 Al-based intermetallic superalloys.It is found that the particle size plays an important role in morphological evolution ofγ’precipitates.For instance,the morphology ofγ’precipitates evolves from cuboidal to strip-like or other complex structures in Ni3 Al-based intermetallic alloys,while theγ’precipitates in Allvac^(■)718 Plus alloy always present nearspherical morphology due to the relatively small initial particle size.The Lifshitz-Slyozof-Wagner(LSW)theory and its modifications,as well as Trans-Interface Diffusion Controlled(TIDC)theory have been applied to describing the coarsening kinetics ofγ’precipitates.Additionally,the hot deformation behavior ofγ’-strengthened superalloy is found to be greatly influenced by the coarsening ofγ’precipitates.

关 键 词：γ’-strengthened superalloy Microstructure COARSENING Hot deformation 

分 类 号：TG132.3[一般工业技术—材料科学与工程]