Dislocation Pipe Diffusion of Mn during Annealing of 5Mn Steel
Jie LIN1,Xi-nan LUO1,Xiao-yan ZHONG1,Hui-hua ZHOU1,Cun-yu WANG2,Jie SHI2,Han DONG2
1. National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials MOE, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University,Beijing 100084, China 2. Central Iron and Steel Research Institute, Beijing 100081, China
Dislocation Pipe Diffusion of Mn during Annealing of 5Mn Steel
Jie LIN1,Xi-nan LUO1,Xiao-yan ZHONG1,Hui-hua ZHOU1,Cun-yu WANG2,Jie SHI2,Han DONG2
1. National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials MOE, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University,Beijing 100084, China 2. Central Iron and Steel Research Institute, Beijing 100081, China
ժҪ The dislocation pipe diffusion of Mn during annealing of 5Mn steel was experimentally investigated using transmission electron microscopy (TEM). Many dislocations existed inside the ferrite and terminated at the ��/�� interface of the sample after intercritical annealing at 650 �� for 1 min. Line scans of Mn distribution demonstrated a high Mn concentration in austenite and Mn enrichment at dislocations, indicating that the dislocation pipe diffusion of Mn during intercritical annealing occurred in addition to the ��/�� interface diffusion. In-situ TEM observations at 500 �� revealed that due to Ostwald ripening, large cementite precipitates grew while small cementite precipitates dissolved via Mn diffusion along the dislocations between them.
Abstract��The dislocation pipe diffusion of Mn during annealing of 5Mn steel was experimentally investigated using transmission electron microscopy (TEM). Many dislocations existed inside the ferrite and terminated at the ��/�� interface of the sample after intercritical annealing at 650 �� for 1 min. Line scans of Mn distribution demonstrated a high Mn concentration in austenite and Mn enrichment at dislocations, indicating that the dislocation pipe diffusion of Mn during intercritical annealing occurred in addition to the ��/�� interface diffusion. In-situ TEM observations at 500 �� revealed that due to Ostwald ripening, large cementite precipitates grew while small cementite precipitates dissolved via Mn diffusion along the dislocations between them.
��������:National Basic Research Program of China;National Natural Science Foundation of China;Specialized Research Fund for the Doctoral Program of Higher Education of China
Jie LIN,Xi-nan LUO,Xiao-yan ZHONG,Hui-hua ZHOU,Cun-yu WANG,Jie SHI,Han DONG. Dislocation Pipe Diffusion of Mn during Annealing of 5Mn Steel[J]. �й������ڿ���, 2016, 23(12): 1277-1280.
Jie LIN,Xi-nan LUO,Xiao-yan ZHONG,Hui-hua ZHOU,Cun-yu WANG,Jie SHI,Han DONG. Dislocation Pipe Diffusion of Mn during Annealing of 5Mn Steel. Chinese Journal of Iron and Steel, 2016, 23(12): 1277-1280.
2016, Vol. 23 
