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讨论了耐热钢在长期高温服役过程中微观组织结构的变化规律。由于对高温性能有重要贡献的微观组织发生了变化，如弥散强化相长大或结构发生变化，固溶强化相中析出第二相使基体中合金元素含量下降，基体中亚结构变化，发生回复与再结晶等，从而使材料高温服役性能下降。为了提高耐热钢的使用寿命，必须提高服役条件下性能最佳的微观结构的稳定性。对于一些在役的已有组织损伤的耐热钢应设法监测其组织损伤的程度，确定损伤临界值，保证设备的安全运行。
The variation regularity of microstructure of heat-resisting steel during its service life is discussed. Due to the high temperature performance of the microstructure has made an important contribution to the changes, such as the dispersion strengthened or the structure changes, solid solution strengthening phase precipitation of the second phase of the matrix alloy content decreased matrix sub-structure changes, the recovery And recrystallization, so that the performance of high temperature service performance decline. In order to increase the service life of heat-resistant steels, the stability of microstructures with the best performance under service conditions must be increased. For some existing tissue damage in the heat-resistant steel should try to monitor the extent of tissue damage, determine the damage threshold, to ensure the safe operation of equipment.