摘要
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。
In this paper, the law of microstructural change for heat resistant steels during long-term elevated-temperature service was discussed. The deterioration of heat resistant steel resulted from the transferring of optimum microstructure under service condition such as the variation of structure, size and shape of precipitates, the reduction of the content of alloy elements in matrix due to the precipitating of second phase, the recovery and recrystallisation of matrix and carbide coarsening etc. The stability of optimum microstructure should be improved in order to increase the service life of the steel. It is proposed to monitor the morphology damage of the steel in service and to determine the critical damage condition for the safe running of equipment.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
1997年第3期67-71,共5页
Ordnance Material Science and Engineering
基金
国家自然科学基金
