45钢500℃等径角挤压过程中渗碳体的溶解与球化行为  

Behavior of Cementite Dissolution and Spheroidization in 45 Steel during Equal Channel Angular Pressing at 500℃

作　　者：冯广海[1] 杜忠泽[1] 王经涛[2] 赵西成[1] 

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055 [2]南京理工大学材料科学与工程系,南京210094

出　　处：《机械工程材料》2011年第8期26-29,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(59974018)

摘　　要：在500℃采用等径角挤压工艺ECAP)制备亚微晶45钢,运用光学显微镜、透射电子显微镜等研究了变形过程中渗碳体的溶解与球化行为。结果表明:ECAP变形过程中片层状的渗碳体发生了剧烈的弯曲、拉伸、扭折、剪切或切断变形,从而变薄、剪断、碎化或在其内部及外表面引入大量的缺陷,导致其处于高能不稳定状态,促进了渗碳体的溶解;剪断和碎化的渗碳体外部各处的曲率各不相同,导致渗碳体逐渐球化。A submicrometer grained 45 steel was prepared by equal channel angular pressing （ECAP） technology at 500℃. The behavior of cementite dissolution and spheroidization during ECAP process was studied by optical microscopy and transmission electron microscopy. The results show that the deformation modes of lamellae cementite included bending, tensing, kinking, shearing and shearing fracture during ECAP process, Cementite attenuation, shearing, refinement or a large number of defects on the surface promoted the cementite dissolution due to thermodynamical unstability. The cementite spheroidization was due to the different curvature in the outside of sheared and refined cementite.

关 键 词：45钢 等径角挤压 渗碳体 溶解 球化 

分 类 号：TG113[金属学及工艺—物理冶金]