Precipitate coarsening and its effects on the hot deformation behavior of the recently developed γ'-strengthened superalloys

• 作者: Yuting Wu Chong Li Xingchuan Xia Hongyan Liang Qiqi Qi Yongchang Liu
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（8）
• 页码范围: 95-104
• 页数: 10页
• 语种: 英文

摘要

Recently,the γ'-strengthened superalloys are of great interests in high temperature applications due to their excellent high temperature strength which is derived from the γ'strengthening phase.For these γ'-strengthened superalloys,the changes in morphology,size and distribution of γ'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-developed γ'-strengthened superalloys and its effects on the hot deformation behavior of superalloys,drawing specific examples on Allvac(R) 718PlusTM and Ni3Al-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 Ni3Al-based intermetallic alloys,while the γ'precipitates in Allvac～ 718Plus 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-lnterface 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 of γ'precipitates.