奥氏体耐热不锈钢310S动态拉伸变形行为研究  

Deformation Behavior of 310S Austenitic Stainless Steel During Dynamic Tensile

作　　者：晁代义[1] 徐仁根[1] 孙学垠[2] 段好林[1] 崔约贤[2] 

机构地区：[1]烟台大学环境与材料工程学院,山东烟台264005 [2]哈尔滨工业大学材料学院,黑龙江哈尔滨150006

出　　处：《烟台大学学报（自然科学与工程版）》2013年第1期58-61,共4页Journal of Yantai University(Natural Science and Engineering Edition)

摘　　要：采用扫描电子显微镜(SEM)静载动态拉伸原位观察方法研究了310S奥氏体耐热不锈钢常温动态拉伸过程中裂纹的萌生、扩展及断裂过程.结果表明:裂纹源容易在夹杂物、基体界面以及应力集中部位形成.随着拉伸变形进行,不同位置形成的微裂纹中,处于与拉伸应力方向相同或相近的有利位相的微裂纹不断亚稳扩展,最后与周围微裂纹连接形成主裂纹.当主裂纹扩展到一定程度达到或超出临界裂纹尺寸后,试样裂纹发生全面失稳扩展而试样迅速断裂.Initiation and propagation of micro cracks in the High-temperature oxidation resistance of austenitic stain- less steel 310S are observed and investigated through in-situ tensile test by using SEM on a sing/e-edge notched specimen. The results show that the micro-crack sources may easily occur at the regions with the second phase par- ticles, matrix interface and stress concentration region. With the development of tensile deformation, the micro- cracks in advantageous orientation propagate continuously mainly by self-propagation and combination with ambient cracks among different position, forming the dominant crack by connection with surrounding cracks. The sample lo- ses its stability and is fractured raoidlv after the cracks propagate to some extent.

关 键 词：动态拉伸 裂纹源 夹杂相 应力集中 

分 类 号：TG132[一般工业技术—材料科学与工程]