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| In-situ TEM Observation of Cementite Coarsening Behavior of 5Mn Steel during Tempering |
| Ye XIA1,Xi-nan LUO1,Xiao-yan ZHONG1,Hui-hua ZHOU1,Cun-yu WANG2,Jie SHI2 |
1. National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, Key Laboratory of Advanced Materials MOE, The State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University,Beijing 100084, China
2. Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract The cementite formation and coarsening behaviors of 0.2 mass% C-5 mass% Mn steel during tempering at 500 �� were investigated by in-situ transmission electron microscope (TEM). In-situ TEM observation showed uniform distribution of cementite particles at the early stage of tempering in the rapidly heated (500 ��/s) sample. Elemental analysis confirmed that the cementite growth was dominated by Mn diffusion. During the cementite growth, the coarsening behavior of intragranular cementite was significantly controlled by the matrix diffusion, while that of the intergranular cementite was mainly governed by the boundary diffusion. The in-situ TEM observation revealed that the dislocation pipe diffusion of Mn took place during tempering, which accelerated the Mn diffusion between cementite particles. The coarsening rates of individual cementite particles were calculated based on the in-situ TEM observation.
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Received: 20 April 2015
Published: 06 May 2016
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| Fund:National Basic Research Program of China;National Basic Research Program of China;National Natural Science Foundation of China;National Natural Science Foundation of China;Specialized Research Fund for the Doctoral Program of Higher Education of China |
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2016, Vol. 23 
