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为探究Super304H钢在高温条件下的结构损伤和力学性能,以超超临界机组中在温度863 K下服役20 000 h的Super304H再热器管材及与其具有相同P函数值、在温度923 K下时效1 100 h的Super304H管材为对象,研究长期服役态Super304H再热器管材组织结构的老化,并开展相同P函数下的时效态与服役态Super304H钢管显微组织老化及力学性能衰减的对比研究。结果表明:钢管内、外壁运行条件的不同导致其显微组织结构产生差异;服役态钢管内侧的显微组织结构、力学性能与具有相同P函数的时效态Super304H钢管相似;然而,服役态钢管外侧的结构损伤比时效态更严重。因此,建立在Larson-Miller参数基础上的人工时效方法,只能在特定条件下模拟服役态钢管的结构损伤。
In order to investigate the structural damage and mechanical properties of Super304H steel under high temperature conditions, Super304H reheater tubing with a capacity of 20 000 h at 863 K in an ultra-supercritical unit and the same P-function value were aged at 923 K 1 100 h of Super304H pipe was used to study the aging of the long-service Super304H reheater tube structure and to compare the aging and the degradation of mechanical properties of the aged Super304H steel tube under the same P function. The results show that the microstructure of the steel pipe is similar to that of the aged Super304H steel with the same P function. However, The structural damage is more serious than the aging state. Therefore, the artificial aging method based on the Larson-Miller parameter can only simulate the structural damage of the service steel tube under certain conditions.