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  4. Mn Diffusion at Early Stage of Intercritical Annealing of 5Mn Steel

钢铁研究学报(英文版), 2015, (11): 1015-1019.

Xi-nan LUO 1, , Xiao-yan ZHONG 2, , Hai-wen LUO 3, , Hui-hua ZHOU 4, , Cun-yu WANG 5, , Jie SHI 6,

1.Beijing National Center for Electron Microscopy, Laboratory of Advanced Materials M0E, The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

2.Beijing National Center for Electron Microscopy, Laboratory of Advanced Materials M0E, The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

3.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

4.Beijing National Center for Electron Microscopy, Laboratory of Advanced Materials M0E, The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

5.Central Iron and Steel Research Institute, Beijing 100081, China

6.Central Iron and Steel Research Institute, Beijing 100081, China

基金项目:   Tsinghua University Initiative Scientiifc Research Program(20141081200)   Specialized Research Fund for the Doctoral Program of Higher Education of China(20100002120047)   Item Sponsored by National Basic Research Program of China(2010CB630800,2015CB921700)   National Natural Science Foundation of China(51001064,51471096)  

Mn Diffusion at Early Stage of Intercritical Annealing of 5Mn Steel

Keywords： Mn diffusion

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 el-emental analysis conifrmed 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 partition-ing local equilibrium mode. Mn segregation at the γ/α 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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