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| Effect of deep cryogenic treatment on martensitic lath refinement and nano-twins formation of low carbon bearing steel |
| Xin-yang Lü1, Zhi-wei Wu1, Xiao He1, Jun Li1, Shao-hong Li1, Mao-sheng Yang2, Kun-yu Zhao1 |
| 1 Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunan, China
2 Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract The effect of heat treatment and deep cryogenic treatment on microstructural evolution of low carbon martensitic bearing steel was investigated. The experimental results showed that the lath martensite was obtained by quenching and a few twins as substructures formed in some martensitic laths. The rudiment of sub-interfaces of martensitic lath was formed in the high-density dislocation regions after deep cryogenic treatment; meanwhile, the number of twins increased, especially in the high-density dislocation regions. This phenomenon is due to the increase in internal stress caused by cryogenic treatment. After tempering, the rudiment of sub-interface further evolved into the martensitic lath boundary, and thus the original martensitic laths were refined. The twins formed by cryogenic treatment did not disappear after tempering. In addition, small quantities of annealing twins formed in tempering process. Martensitic laths morphology and substructures in di?erent stages of the heat and deep cryogenic treatment were observed by transmission electron microscopy.
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Received: 17 December 2018
Published: 25 January 2020
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| Cite this article: |
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Xin-yang Lü,Zhi-wei Wu,Xiao He, et al. Effect of deep cryogenic treatment on martensitic lath refinement and nano-twins formation of low carbon bearing steel[J]. Journal of Iron and Steel Research International, 2020, 27(1): 105-113.
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2020, Vol. 27 
