超高锰钢原位拉伸断裂及机理分析  

In-situ Tension Fracture of Super-high Mn Steel and Mechanism Analysis

作　　者：李保元[1] 赵清[2] 

机构地区：[1]河南科技大学工程训练中心,河南洛阳471023 [2]河南科技大学土木工程学院,河南洛阳471023

出　　处：《热加工工艺》2016年第14期36-38,共3页Hot Working Technology

基　　金："先进耐磨材料"教育部长江学者创新团队支持计划(IRT1234)

摘　　要：采用沉淀强化热处理对超高锰钢进行强韧化处理,利用扫描电镜观察材料的裂纹扩展,研究在单向拉伸载荷下材料的断裂机理。结果表明,材料受载后在奥氏体内形成高密度滑移,裂纹主要萌生在预制缺陷处、滑移线密集处;裂纹的扩展以晶内扩展为主,碳化物/奥氏体相界面扩展次之。组织中弥散分布的碳化物对裂纹的扩展有阻碍作用,当裂纹与碳化物相遇时,裂纹转向薄弱区。The super-high manganese steels were strengthen-toughened by precipitation strengthened treatment. The crack propagation of the steel was observed by SEM, and the fracture mechanism of the steel under uniaixal tension was analyzed. The results show that high density slip-lines appear after loading, and the crack initiates at prefabricated defect and the high density slip-lines. The crack propagation is mainly across the austenite crystal and propagates along the matrix/particles interface secondarily. The crack growth could be influenced by carbide particles dispersively distributing in the austenite crystal, when it encounters the carbide particles, the growth direction turns toward the weaker areas.

关 键 词：超高锰钢 原位拉伸 裂纹萌生 裂纹扩展 

分 类 号：TG113.1[金属学及工艺—物理冶金] TG115.5[金属学及工艺—金属学]