P91钢管的长期高温服役组织与性能  

Microstructure and properties of P91 steel pipe after long term high temperature service

作　　者：张英伟 白建强 白占桥 李炜丽 谌康 董树青 Zhang Yingwei;Bai Jianqiang;Bai Zhanqiao;Li Weili;Shen Kang;Dong Shuqing(Inner Mongolia Datang International Tuoketuo Power Generation Co.,Ltd.,Hohhot Inner Mongolia 010200,China;Institute of North China Electric Power Test and Research,China Datang Corporation Science and Technology Institute,Beijing 100040,China)

机构地区：[1]内蒙古大唐国际托克托发电有限责任公司,内蒙古呼和浩特010200 [2]中国大唐集团科学技术研究总院有限公司华北电力试验研究院,北京100040

出　　处：《金属热处理》2024年第9期43-46,共4页Heat Treatment of Metals

摘　　要：P91钢管额定运行温度541℃,运行压力17.5 MPa,规格Φ194 mm×25 mm,服役约7.8万小时后,硬度低于标准下限。采用金相、透射电镜、化学相分析、持久性能等试验方法,对某亚临界锅炉用P91钢管长期服役后的组织和性能开展研究。结果表明:P91钢管长期高温服役后马氏体板条宽化和晶界M_(23)C_(6)相粗化是导致其高温强度降低的主要原因。通过P91钢管取样持久试验,566℃外推10万小时持久强度值为72 MPa,为P91钢剩余寿命评估提供数据参考。Rated operating temperature of the P91 steel pipe was 541℃,the operating pressure was 17.5 MPa,and the specification wasΦ194 mm x25 mm.After about 78000 h of service,its hardness was below the lower limit of the standard.Microstructure and properties of the P91 steel pipes used in a subcritical boiler after long-term service was investigated by means of metallographic,transmission electron microscopy,chemical phase analysis,creep-rupture properties and other test methods,respectively.The results show that the widening of martensite laths and the coarsening of the M_(23)C_(6) phase at the grain boundaries of the P91 steel pipes after long-term high-temperature service are the main reasons for the decrease in high-temperature strength.Specimens were taken from the P91 steel tubes for endurance testing,resulting in creep rupture strength value of 72 MPa for 100000 h of extrapolation at 566 ℃.Data can be used as the reference for the assessment of the creep life of the P91 steel.

关 键 词：P91钢管 长期高温服役 组织 性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]