In-situ TEM Observation of Cementite Coarsening Behavior of 5Mn Steel during Tempering  

作　　者：Ye XIA Xi-nan LUO Xiao-yan ZHONG Hui-hua ZHOU Cun-yu WANG Jie SHI 

机构地区：[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

出　　处：《Journal of Iron and Steel Research International》2016年第5期442-446,共5页

基　　金：Item Sponsored by National Basic Research Program of China(2010CB630800,2015CB921700);National Natural Science Foundation of China(51471096,51001064);Specialized Research Fund for the Dectoral Program of Higher Education of China(20100002120047)

摘　　要：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.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.

关 键 词：in-situ observation cementite coarsening behavior Mn diffusion 5Mn steel tempering 

分 类 号：TG142.1[一般工业技术—材料科学与工程]