Dislocation Pipe Diffusion of Mn during Annealing of 5Mn Steel

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• 作者：Jie LIN^a ; ^{jaylin0256@163.com}Author Vitae ; Xi-nan LUO^a ; Xiao-yan ZHONG^a ; ^{xyzhong@mail.tsinghua.edu.cn} ; Hui-hua ZHOU^a ; Cun-yu WANG^b ; Jie SHI^b ; Han DONG^b
• 关键词：Mn diffusion ; dislocation pipe ; annealing ; 5Mn steel ; in-situ heating
• 刊名：Journal of Iron and Steel Research, International
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：23
• 期：12
• 页码：1277-1280
• 全文大小：923 K
• 卷排序：23

文摘

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 α/γ interface of the sample after intercritical annealing at 650 °C 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 γ/α interface diffusion. In-situ TEM observations at 500 °C revealed that due to Ostwald ripening, large cementite precipitates grew while small cementite precipitates dissolved via Mn diffusion along the dislocations between them.