摘要
通过宏观检查、胀粗测量、金相组织检查、室温拉伸力学性能测试及应力校核,对过热器炉管爆管原因进行了分析。结果表明:长期运行的炉管内外壁氧化严重,影响管道传热,加剧了管道过热运行情况,胀粗、减薄明显,金相组织已完全珠光体球化,使材料强度低于实际承载应力而发生过载失效。建议加强胀粗和氧化测量,并定期进行金相检查,及时发现问题,更换管道。
The failure causes of tube bursting at superheater were analyzed by many tests and several research methods,such as macro inspection,dimensional measurement of tube perimeter change,microstructure examination,mechanical testing and stress check.The results show that the tube is severely oxidized and overheated,which intensifies the situation of overheating operation.Inflation of the tube,thinning of the tube wall and fully pearlite spheroidized microstructure can be observed,and the strength of the material deteriorates significantly.It is concluded that the tube failure mode is overloading.At the same time,some useful suggestions such as periodic measurement of tube perimeter and metallographic examination are proposed,which can be a reference for operation and maintenance.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2012年第4期12-16,共5页
Journal of Materials Engineering
关键词
爆管
过热
应力校核
过载
burst
overheating
stress check
overloading
