30Cr2Ni2Mo拉杆断裂失效分析  

Failure Analysis of 30Cr2Ni2Mo Rod

作　　者：鞠新华[1] 严春莲[1] 刘晓岚[1] 任群[1] 尹立新[1] 罗家明[1] 

机构地区：[1]首钢技术研究院检测中心,北京100043

出　　处：《物理测试》2009年第6期48-52,57,共6页Physics Examination and Testing

摘　　要：某机械厂生产的连铸机扇形段水平段在钢厂使用半年后拉杆发生失效断裂。文章采用力学性能测试、化学分析、断口和组织观察以及模拟热处理实验对30Cr2Ni2Mo拉杆断裂失效的原因进行了分析。结果表明:30Cr2Ni2Mo拉杆发生的是冰糖状沿晶脆断;材质的高温回火脆性导致韧性不足,再加上预紧可能的操作不当以及环境腐蚀的共同作用促进了裂纹发生并导致最终断裂。Macro-and micro-observation of fracture morphology, chemical analysis, microstructure observation and mechanical tests were used to analyze the fracture reason of 30Cr2Ni2Mo rod. It was shown that the main fracture mechanism of 30Cr2Ni2Mo rod was intergranular brittleness. The fracture was mainly caused by the high temperature tempering brittleness of this rod in addition to environmental corrosion and the incorrect operation of advanced tightening.

关 键 词：30Cr2Ni2Mo拉杆 高温回火脆性 沿晶脆断 失效分析 

分 类 号：TG115.5[金属学及工艺—物理冶金]