Abstract A series of long-term high-temperature aging tests of ASME A335-P92 steel from 1,000 to 29,000 h at 650°C were carried out. The microstructure evolution of as-received and aging specimens at different stages was investigated using optical microscope observations, scanning electron microscope examinations, and TEM investigations. The static mechanical strength properties (yield strength/ultimate tensile strength) at room and 600°C test temperatures and the plastic performance (elongation/reduction in area) were also analyzed. The experimental results show that the Laves phase can be precipitated rapidly in the early aging period. After a certain aging period, the continuous precipitation of M23C6 and the relatively high coarsening rate of Laves resulted in a rapid decrease of room and high-temperature mechanical properties in the early aging period. However afterwards for the long aging time, a slow decline in tendency of mechanical properties was presented.

中文翻译：

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P92钢650℃高温长期时效后组织和力学性能研究

摘要 对ASME A335-P92钢进行了650℃、1000～29000小时的一系列长期高温老化试验。使用光学显微镜观察、扫描电子显微镜检查和 TEM 调查研究了不同阶段的原样和老化试样的微观结构演变。还分析了室温和 600°C 试验温度下的静态机械强度性能（屈服强度/极限拉伸强度）和塑性性能（伸长率/面积减少）。实验结果表明，Laves 相在时效早期能迅速析出。经过一定的老化期后，M23C6的连续析出和Laves相对较高的粗化率导致早期时效期室温和高温力学性能迅速下降。但经过长时间的老化，力学性能呈现缓慢下降的趋势。