Effect of hot deformation parameter on microstructural evolution in a novel P/M superalloy
WANG Minxi1，2，LIU Jiantao1，2，3，ZHANG Yiwen1，2，3，BAI Jiaming1，2，4
（1. High Temperature Material Institute, Central Iron and Steel Research Institute, Beijing 100081, China;2. Beijing
CISRI-GAONAMaterials & Technology Co. Ltd., Beijing 100081, China; 3. Beijing Key Laboratory of Advanced
High Temperature Materials, Beijing 100081, China; 4. School of Materials Science and Engineering,
Northeastern University, Shenyang 110819, China）
Abstract：Electron back-scattered diffraction (EBSD) was used to analyze microstructural evolution of a novel P/
M superalloy after hot deformation. The results show that increasing deformation temperature can promote dynamic
recrystallization (DRX). Meanwhile, the increase of strain rate inhibites the recrystallization first, and then increases
the recrystallization fraction. High deformation temperature and low strain rate can promote the grain
growth. The increase of deformation temperature is conducive to the formation of twins. However, the reduce of interfacial
energy at high deformation temperature will inhibit the formation of twin. Meanwhile, the decrease of migration
time first inhibits the formation of twin, and then the increase of storage energy at high strain rate will increase
the fraction of twin. The rise of deformation temperature enhances dynamic recovery (DRV), reducing the
density of geometrically necessary dislocation (GND). Because of the decrease of DRV time and the generation of
compression heat, with the increase of strain rate, GND density first increases and then decreases.
王旻曦，刘建涛，张义文，白佳铭. 热压缩参数对新型粉末高温合金微观组织的影响[J]. 粉末冶金工业, 2022, 32(06): 58-63.
WANG Minxi，LIU Jiantao，ZHANG Yiwen，BAI Jiaming. Effect of hot deformation parameter on microstructural evolution in a novel P/M superalloy. Powder Metallurgy Industry, 2022, 32(06): 58-63.
2022, Vol. 32 
