Significant changes in microstructure and grain boundary character distributions were observed,which are attributed as the major cause for failure of the ROF internal cover due to very high temperature service conditions.

• 研究结果表明,服役前后YUS701奥氏体不锈钢ROF内罩在显微组织和晶界特征分布上有明显的差异,这种差异是ROF内罩超高温运行失效的重要原因。