摘要
Abstract
In order to analyze the evolution of microstructure and mechanical properties of 20Cr1Mo1VNbTiB bolt material after service operation for about 50 000 h,equipment such as direct reading spectrometer,metallographic microscope,scanning electron microscope,transmission electron microscope was used in the observation.Meanwhile,the results of room temperature tensile test,Brinell hardness test,impact test,etc.,were compared with the data of raw materials that had not been in service,and whether the used bolts could go on service was verified comprehensively.The results showed that after service operation for about 50 000 h,part of the lath bundles in the microstructure had broadened and recrystallized,and the precipitation of carbides at grain boundaries had increased.Although the hardness,strength and impact energy of the bolts had decreased,the requirements of the ex-factory standards could still be met.The research results can provide data support for continued long-term service of bolts under normal service conditions.关键词
20Cr1Mo1VNbTiB/螺栓/微观组织/高温服役Key words
20Cr1Mo1VNbTiB/bolt/microstructure/service at high temperature分类
能源与动力
