ECAP温变形制备亚微晶钢中渗碳体变形特征  

Characteristics of cementite deformation in submicrometer grained steel by equal channel angular pressing

作　　者：冯广海[1] 黄俊霞[2] 杜忠泽[1] 王经涛[3] 赵西成[1] 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]宝钢集团-钢公司技术中心,上海200931 [3]南京理工大学材料科学与工程系,江苏南京210094

出　　处：《材料热处理学报》2011年第6期58-62,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金资助项目(59974018);陕西省自然科学基金资助项目(2003E121)

摘　　要：采用透射和扫描电子显微镜研究了ECAP变形中渗碳体的变形特征。结果表明:片状渗碳体相主要以弯曲变形、剪切变形、拉伸变形、扭折变形和剪断变形5种方式协调ECAP剧烈塑性变形,这表明在本实验ECAP纯剪切变形条件下钢中硬而脆的渗碳体相具有良好的塑性变形能力。渗碳体片层的变形方式主要是取决于渗碳体所处的应力状态,而渗碳体所处的应力状态是与渗碳体的片层取向和片层厚度密切相关,其中渗碳体的片层厚度起决定性作用。Characteristics of cementite deformation in a submicrometer grained steel by warm ECAP was investigated by means of scanning electron microscopy（SEM） and transmission electron microscopy（TEM） technique.The results show that the deformation modes of cementite lamellae in steel include bending deformation,shearing deformation,tension deformation,kinking deformation and shearing fracture without cracking in order to coordinate the severe shear deformation in ECAP.It indicates that the hard and brittle cementite lamellae in steel have a considerable ability of plastic deformation under the present shear deformation conditions.The deformation coordination mode of cementite lamellae in steel is very closely related to the stress state of cementite lamellae which significantly depends on cementite lamellae thickness and orientation relationship between the cementite lamellae and shear stress direction,especially on cementite lamellae thickness.

关 键 词：亚微晶材料 钢 ECAP变形 渗碳体 显微组织 

分 类 号：TG142.2[一般工业技术—材料科学与工程]