摘要
30CrMnSiA螺栓在安装一段时间后断裂。通过断口宏微观观察、金相组织检查、硬度和化学成分检测、破坏拉力试验、氢含量测定以及模拟试验等,确定了螺栓断裂性质和原因。结果表明,螺栓在其材质氢含量仅1ppm条件下发生断裂的性质为氢脆断裂,断裂原因并非由于氢含量过高,而主要是由于该批次螺栓存在一定程度的回火脆化,加之螺栓材质C元素含量偏高和马氏体组织较粗大,提高了螺栓材料的抗拉强度,增加了材料的氢脆敏感性,最终导致螺栓的氢脆断裂。
A bolt fractured during the working process. Based on macro and micro appearance observation, metallurgical structure inspection, hardness and chemical composition analysis, tension and hydrogen content testing, and simulation experimentation, the fracture mechanism and cause were found. The results showed that the fracture of the bolt was caused by hydrogen embrittlement under the condition that the hydrogen content of the bolt material was only 1 ppm. The main cause of the bolt fracture was not high hydrogen content but temper brittleness. In addition, hydrogen embrittlement sensitivity of the bolt material increased because of high intension resulting from high C content and coarse microstructure.
出处
《失效分析与预防》
2008年第2期42-47,共6页
Failure Analysis and Prevention
关键词
螺栓
断裂
氢脆
回火脆
bolt
fracture
hydrogen embrittlement
temper brittleness
