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| Mn Diffusion at Early Stage of Intercritical Annealing of 5Mn Steel |
| Xi-nan LUO1, Xiao-yan ZHONG1, Hai-wen LUO2, Hui-hua ZHOU1, Cun-yu WANG3, Jie SHI3 |
1. Beijing National Center for Electron Microscopy, Laboratory of Advanced Materials MOE, The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
3. Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract Mn distribution and austenite morphology at the early stage of intercritical annealing of 5Mn steel were investigated. It was experimentally demonstrated that a newly formed 20 nm-thick austenite was formed without the partitioning of Mn. The elemental analysis confirmed that the growth of austenite should be controlled by the diffusion of C prior to the diffusion of Mn at a low heating rate. The austenite growth started under negligible-partitioning local equilibrium mode and then switched to partitioning local equilibrium mode. Mn segregation at the ��/�� interface suggested that the collector plate mechanism was the essential way of Mn partitioning at the early stage of austenite growth.
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Received: 29 September 2014
Published: 09 November 2015
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| Fund:National Basic Research Program of China;National Basic Research Program of China;National Natural Science Foundation of China |
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Corresponding Authors:
Xiao-yan
E-mail: xyzhong@mail.tsinghua.edu.cn
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2015, Vol. 22 
