Carbide precipitation and microstructure refinement of Cr-Co-Mo-Ni bearing steel during hot deformation
Carbide precipitation and microstructure refinement of Cr-Co-Mo-Ni bearing steel during hot deformation作者机构：Faculty of Material Science and Engineering Kunming University of Science and Technology Central Iron and Steel Research Institute New Metallurgy Hi-tech Group Co. Ltd. China Iron and Steel Research Institute Group
出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)
年 卷 期：2015年第22卷第9期
页 面：3265-3274页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
主 题：high-alloy steel Z parameter grain size refinement carbides dynamic recrystallization (DRX) mechanism
摘 要：The dynamic recrystallization and carbides precipitation of the Cr-Co-Mo-Ni bearing steel were investigated by hot compression tests performed at temperatures ranging from 850 ℃to 1080 ℃ with strain rate of 1-20 s-1. The activation energy（Q） for the tested steel is calculated to be around 682.99 k J/mol at a deformation strain of 0.6. Microstructural analysis by SEM shows that the dynamic recrystallization（DRX） behavior is dependent sensitively on the deformation strain, temperature and strain rate, while an exponential relationship between DRX grain size and Z parameter is obtained from the computational formula. Moreover, the M6C-type carbides（〈1 μm） act as the main prohibitor of grain coarsening, and the polynomial regression relationship between them is worked out. With electron backscatter diffraction（EBSD） observation, DRX is the main nucleation mechanism responsible for the formation of new grains during hot compression. In conclusion, the interaction between DRX affected by hot deformation parameters and carbides precipitation determines the ultimate grain size refinement.
维普期刊数据库
同方期刊数据库