低硬度P91主蒸汽管道弯头的寿命评估  

Life Assessment of a Low Hardness Elbow for the P91 Main Steam Pipe

作　　者：张永军 张伟妮 王峥 王延峰 Zhang Yongjun;Zhang Weini;Wang Zheng;Wang Yanfeng(Shanxi Datang International Yuncheng Power Generation Co.,Ltd., Yuncheng 044000,Shanxi Province, China;Shanghai Power Equipment Research Institute Co., Ltd., Shanghai 200240, China)

机构地区：[1]山西大唐国际运城发电有限责任公司,山西运城044000 [2]上海发电设备成套设计研究院有限责任公司,上海200240

出　　处：《发电设备》2021年第1期46-48,共3页Power Equipment

摘　　要：某火电机组P91主蒸汽管道的某个弯头硬度偏低,对其进行组织分析和寿命评估。结果表明:该弯头的显微组织大部分为铁素体+碳化物,析出相主要为Cr23C6相和富Mo元素的Laves相;当管道在541℃、17.5 MPa下服役时,该弯头的剩余寿命为5.47×10^4 h。Microstructure analysis and life assessment were conducted on an elbow of low hardness for the P91 main steam pipe in a thermal power unit.Results show that the microstructure of the elbow is majorly composed of ferrite and carbide,and the precipitated phases are mainly made up of Cr23C6 and Mo-rich Laves.The residual life of the elbow is expected to be 5.47×104 hours when it runs at 541℃and 17.5 MPa.

关 键 词：火电机组 P91钢 弯头 寿命评估 

分 类 号：TG142.41[金属学及工艺—金属材料]