CAJ | 학술논문

通过化学成分分析、力学性能测试、金相组织分析、断口扫描电镜分析等方法，对沿海化学工业区某石化企业管道阀门不锈钢螺栓的断裂原因进行了分析。分析结果表明，螺栓材料的碳质量分数偏高，超过了相关标准中的要求，螺栓经过形变强化处理，在晶界处有明显的碳化物析出，断口为岩石状沿晶断裂特征，断口中含有 Cl 元素。螺栓材料碳质量分数超标，同时未进行固溶热处理，加之在沿海大气环境中服役，导致螺栓发生了沿晶应力腐蚀开裂。
통과화학성분분석、역학성능측시、금상조직분석、단구소묘전경분석등방법，대연해화학공업구모석화기업관도벌문불수강라전적단렬원인진행료분석。분석결과표명，라전재료적탄질량분수편고，초과료상관표준중적요구，라전경과형변강화처리，재정계처유명현적탄화물석출，단구위암석상연정단렬특정，단구중함유 Cl 원소。라전재료탄질량분수초표，동시미진행고용열처리，가지재연해대기배경중복역，도치라전발생료연정응력부식개렬。
According to the use of chemical analysis,mechanical testing,metallurgical analysis, SEM analysis of fracture and other methods,the case of austenitic stainless steel bolts fracture failure in Coastal Chemical Industrial Park is analyzed.The results show that,the carbon content of the bolts exceeds the standard requirement,the bolts receive deformation strengthening treat-ment,in the grain boundary carbide precipitation at the obvious,and the rock-like characteristics of intergranular fracture has been found.In conclusion,the primary reason is carbon content go beyond the standard requirement and the bolts has not been performed by the solution heat treat-ment,all those lead the occurrence of stress corrosion cracking.