Analysis of cracking failure of high-temperature superheater tube in power plant boiler
In order to explore the cause of the cracking of the elbow,it was decided to use spectrom-eter,metallographic microscope,microhardness tester and scanning electron microscope to carry out physical and chemical research on the failed elbow.After analysis,it is found that after the cold bending process of the superheater elbow,due to the lack of normal heat treatment,there is residual stress at the bend,which leads to the increase of local stress,and the temperature difference of the elbow in the service process is large,forming thermal alternating stress,and the treatment of boiler water is not up to standard,resulting in chloride ions entering the inside of the elbow,and finally leading to the cracking and failure of the elbow due to stress corrosion.
万方数据
维普
