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采用光学显微镜、扫描电子显微镜、能谱分析(EDS)等多种检测手段对水冷管线断裂管组织、成分、断裂方式和断口形貌进行分析,找出开裂失效原因和失效机理。结果表明,该水冷管线为沿晶开裂,晶粒间析出碳化物(Fe,Cr)23C6。分析认为由于焊接工艺控制不当,在高温区停留过久,造成焊缝附近热影响区晶间析出(Fe,Cr)23C6,使晶界贫铬,发生晶间腐蚀,最终造成沿晶开裂。
The microstructure, composition, fracture mode and fracture morphology of the rupture tube in water-cooled pipeline were analyzed by optical microscope, scanning electron microscopy, energy dispersive spectroscopy (EDS) and other testing methods to find out the cause of cracking failure and failure mechanism. The results show that the water-cooled pipe is intergranular cracking and carbide (Fe, Cr) 23C6 precipitates between the grains. The analysis shows that due to improper control of the welding process, it stays in the high temperature for a long time, resulting in the precipitation of (Fe, Cr) 23C6 in the heat affected zone near the weld seam, resulting in poor intergranular corrosion and eventually cracking along the crystal.