Analysis on Microstructure and Performance of In-service 15Cr1Mo1V Steel Reheat Steam Pipe Welded Joint
Taking the welded joint of 15Cr1Mo1V steel reheat steam pipe in service in a power plant as the research object,its microstructure,hardness,room temperature and high temperature tensile properties were analyzed.The results show that there are granular precipitates in grains and at grain boundary of the heat affected zone and weld zone of the reheat steam pipe welded joint,and the aging phenomenon appears in the joint structure.The hardness of the heat affected zone and weld zone of the pipeline welded joint is higher,which increases the risk of brittle failure of pipeline.The room temperature and high temperature tensile results show that the strength of the weld zone is higher than that of the base metal,and the plasticity of the weld zone is slightly lower than that of the base metal,indicating that the risk of preferential failure of the weld zone is low no matter at room temperature or at high temperature.
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