摘要
某公司生产的阀箱,在试压过程中发生开裂,为确定阀箱开裂原因,对开裂阀箱材料的力学性能、显微组织、裂纹及断口形貌进行了分析和检验。结果表明,阀箱材料中存在严重的枝晶偏析,在偏析严重的区域存在锻造裂纹缺陷,缺陷附近发生氢致延迟开裂,最终在测试水压的作用下,裂纹失稳扩展导致阀箱发生开裂。针对开裂原因,提出了改进工艺的建议。
The reasons for the cracking failure of some valve housing in the pressure testing were analyzed by means of mechanical properties test,and microstructure and fracture morphology observation. The results show that the forging crack can be attributed to serious dendritic segregation of the valve housing material. Some counter measures for improvement are suggested.
出处
《金属热处理》
CAS
CSCD
北大核心
2017年第7期176-179,共4页
Heat Treatment of Metals
关键词
阀箱
锻造裂纹
枝晶偏析
valve housing
forging crack
dendritic segregation
