Carbide precipitation and microstructure refinement of Cr-Co-Mo-Ni bearing steel during hot deformation

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 °C to 1080 °C with strain rate of 1-20 s -1 . The activation energy ( Q ) for the tested steel is calculated to be around 68...

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Bibliographic Details
Published in:Journal of Central South University 2015-09, Vol.22 (9), p.3265-3274
Main Authors: Yuan, Xiao-hong, Zheng, Shan-ju, Yang, Mao-sheng, Zhao, Kun-yu
Format: Article
Language:English
Subjects:
Engineering
Metallic Materials
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Summary: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 °C to 1080 °C with strain rate of 1-20 s -1 . The activation energy ( Q ) for the tested steel is calculated to be around 682.99 kJ/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 (
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-015-2865-3