摘要
通过力学性能试验、光学显微镜和扫描电子显微镜分析,研究了焊后热处理温度和热处理次数对P91钢组织及室温力学性能的影响。结果表明:与交货态母材相比,历经5次760℃焊后热处理后,P91钢的显微组织未明显老化,仍为回火板条马氏体,其强度和硬度有所下降,但幅度较小;790℃及以上温度焊后热处理后,马氏体分解,碳化物聚集长大并粗化,显微组织的老化随温度的升高而加剧,其强度和硬度下降明显,已不能满足相关标准要求。
By means of mechanical property tests,optical microscopy (OM) and scanning electron microscopy (SEM),the effects of frequency and temperature of post-weld heat treatment (PWHT) on microstructure and properties of P91 steel were investigated.Results show that,after 5 times of PWHT at 760 ℃,compared with the base metal in delivery status,the aging behavior of treated P91 steel is not obvious,which still keeps the structure of lath martensite,with slightly lowered strength and hardness.When the PWHT temperature gets above 790 ℃,the martensite decomposes,the carbide aggregates and grows,and the aging of microstructure intensifies with the rise of PWHT temperature,leading to obviously reduced strength and hardness of the steel,which therefore can not satisfy the requirements of relevant standards.
作者
曾凡伟
谢逍原
张学星
曾辉
高淼淼
陈莉君
Zeng Fanwei;Xie Xiaoyuan;Zhang Xuexing;Zeng Hui;Gao Miaomiao;Chen Lijun(Dongfang Boiler Group Co.,Ltd.,Zigong 643001,Sichuan Province,China;China Datang Corporation Science and Technology Research Institute Co.,Ltd.,Beijing 100040,China)
出处
《发电设备》
2019年第5期335-339,共5页
Power Equipment
