18-8型奥氏体不锈钢在低周疲劳变形下的微观组织特征  

Characteristics of Microstructure in 18-8 Type Austenitic Stainless Steel under Low Cycle Fatigue Deformation

作　　者：罗治平 陈成澍[2] 鄢文彬[2] 陶佑卿[2] 

机构地区：[1]北京航空材料研究所 [2]西南交通大学

出　　处：《金属科学与工艺》1992年第1期1-5,共5页

基　　金：国家自然科学基金资助课题58971068

摘　　要：利用透射电镜系统地研究了18—8型奥氏体不锈钢在低周疲劳变形下的微观组织,包括奥氏体位错组态,形变孪晶和形变马氏体。发现奥氏体位错组态与应变幅和温度有关,形变马氏体主要在 SB 交截处形核,在室温和低温下由于母相变形方式的不同而产生不同的组织特征。Systematic investigations on microstructure in 18-8 type austenitic stainless steel under low cycle fatigue deformation were made by TEM, including dislocation configurations in austenite,deformation twin,and deformation-induced martensite.As a result,the dislocation configurations in austenite were dependent on strain amplitude and temperature,defor- mation-induced martensite nucleated mainly at the intersections of slip bands. Different structural characteristics were shown at room and low temperature because of the different deformation mode of the parent phase.

关 键 词：奥氏体 不锈钢 低周 疲劳变形 组织 

分 类 号：TG142.71[一般工业技术—材料科学与工程]