Microstructure and microtexture evolution characteristics of a powder metallurgy Ni-based superalloy during static recrystallization  

作　　者：Zhi-qiang Li De-cheng Wang Yue-wen Zhai Chao Jiang Le-yu Zhou Zhi-guang Zhou Hui-zhen Wang Zi-bo Zhang Lin Yan Li-ping Wang Guang Yu 

机构地区：[1]Department of Mechanical Engineering,Tsinghua University,Beijing,100084,China [2]Beijing Research Institute of Mechanical and Electrical Technology Co.,Ltd.,CAM,Beijing,100083,China [3]China Academy of Machinery Science and Technology Group,Beijing,100044,China [4]Institute of Advanced Manufacturing and Intelligent Technology,Beijing University of Technology,Beijing,100124,China

出　　处：《Journal of Iron and Steel Research International》2024年第9期2308-2325,共18页钢铁研究学报（英文版）

基　　金：supported by the technology development fund of Beijing Research Institute of Mechanical&Electrical Technology Co.,Ltd.,CAM,Construction of Innovation Leading Talents and Innovation Team of China Academy of Machinery Science and Technology Group:Vacuum forming technology and equipment innovation team.

摘　　要：Static recrystallization(SRX)characteristics of a powder metallurgy superalloy were investigated by isothermal compression at 1080–1170℃ under strain rates of 0.01–0.1 s^(−1),strains of 0.1,0.22,or 0.5,and holding time of 0–300 s.The impacts of temperature,strain rate,holding time,and strain on the SRXed grain size,volume fraction,and microtexture were explored by electron backscatter diffraction technique.It was found that temperature played a key role in these processes.As SRX progressed,the<110>fiber parallel to the axis compression direction gradually weakened and was replaced by the<001>fiber because<001>was the preferred recrystallization orientation and grain growth direction for the Ni-based superalloy.Moreover,high temperatures and low strain rates promoted the formation of the<001>fiber.Three nucleation mechanisms during SRX process were found:grain boundary bulging,primary twin assistance,and subgrain coalescence.Grain boundary bulging occurred under all process conditions;however,at low temperatures and high strain rates,the latter two mechanisms could provide additional nucleation modes.In addition,SRX size and volume fraction models were established.

关 键 词：Powder metallurgy Ni-based superalloy Static recrystallization Microtexture evolution Recrystallization mechanism Prediction model 

分 类 号：TG14[一般工业技术—材料科学与工程]