Microstructural evolution and thermal stability after aging of a cobalt-containing martensitic bearing steel
Journal Article
·
· Materials Characterization
- School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093 (China)
- Department of Structural Materials, Central Iron and Steel Research Institute, Beijing 100081 (China)
The microstructural changes and thermal stability of a cobalt-containing martensitic heat resistance bearing steel have been investigated in this paper. The hardness variation showed a progressive hardness decrease associated with coarsening of fine carbides at elevated temperatures. The precipitation of secondary phases during tempering at 500 °C for 10 h and 100 h has been characterized and identified in detail using transmission electron microscopy. The results revealed that the aging treatment induced very fine secondary M{sub 6}C precipitates which were responsible for the secondary hardening peak when tempered at 500 °C for 30 h. But the hardness gradually decreased due to the coarsening of M{sub 6}C carbide and other secondary phases (such as μ phase, σ phase, and χ phase) precipitation when the samples were tempered over 30 h at 500 °C. - Highlights: •Retained austenite fraction was reduced after cryogenic treatment. •Secondary hardening was responsible for M{sub 6}C precipitates. •TEM study to investigate different phases characteristics •Coarsening of carbides during aging has a significant effect on mechanical properties.
- OSTI ID:
- 22689715
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Vol. 124; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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