Dislocation Pipe Diffusion of Mn during Annealing of 5Mn Steel  

作　　者：Jie LIN Xi-nan LUO Xiao-yan ZHONG Hui-hua ZHOU Cun-yu WANG Jie SHI Han DONG 

机构地区：[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

出　　处：《Journal of Iron and Steel Research International》2016年第12期1277-1280,共4页

基　　金：Item Sponsored by National Key Research and Development Program of China(2016YFB0700402);National Basic Research Program of China(2010CB630800,2015CB921700);National Natural Science Foundation of China(51671112,51471096,51390471,11374174);Tsinghua University Initiative Scientific Research Program(20141081200,20131089311)

摘　　要：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/γin- terface of the sample after intercritieal 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 γ/α 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.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/γin- terface of the sample after intercritieal 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 γ/α 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.

关 键 词：Mn diffusion dislocation pipe ANNEALING 5Mn steel in-situ heating 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG156.2[金属学及工艺—金属材料]