摘要
通过焊接试验 ,借助金相显微镜和扫描电子显微镜 ,对服役炉管焊接接头开裂原因及影响因素进行了分析研究。焊接裂纹在热影响区垂直于焊缝横向启裂 ,平行于焊缝纵向扩展 ,具有沿晶特征。炉管母材晶界渗碳氧化是裂纹开裂的内在因素 ,组织沿晶损伤及孔洞形成是其微观现象 。
Cracking reason and influence factor about weld joint of serviced tube are analyzed in weld test, by means of metallurgical microscope and scanning electron microscope Weld cracks in heat affected zone initiate vertically,extend parallel to weld It is characteristic of intergranular fracture Carburization and oxidization along grain boundary are internal factors of furnace tube cracking, microstructure damage along grain boundary and void formation are microphenomenon Welding procedure and restrictive degree also affact initiation and progation of crack
出处
《石油化工设备》
CAS
2003年第6期10-13,共4页
Petro-Chemical Equipment
