长期服役后末级再热器12Cr1MoVG钢管的组织性能和剩余寿命评估  

Microstructure,Performance and Remaining Life Assessment of 12Cr1MoVG Steel Pipe of Final Reheater after Long Service

作　　者：刘泰然 张一可 王志武[2] 句光宇 LIU Tairan;ZHANG Yike;WANG Zhiwu;JU Guangyu(Henan Agricultural University,Zhengzhou 450046,China;Wuhan University,Wuhan 430072,China;Central China Electric Power Test Research Institute,Datang Group Science and Technology Research Institute Co.,Ltd.,Zhengzhou 450000,China)

机构地区：[1]河南农业大学,郑州450046 [2]武汉大学,武汉430072 [3]中国大唐集团科学技术研究院有限公司华中电力试验研究院,郑州450000

出　　处：《理化检验（物理分册）》2021年第11期1-5,74,共6页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：利用光学显微镜、扫描电镜、能谱仪、维氏硬度计等仪器,对服役1×10^(5)h后某火电机组末级再热器12Cr1MoVG钢管进行组织分析、力学性能测试和剩余寿命评估。结果表明:该钢管的化学成分、力学性能均符合标准要求;钢管处于应力安全状态;钢管珠光体球化级别为3~4级,合金元素产生了明显的再分配现象,固溶合金元素贫化明显;未见蠕变孔洞,蠕变处于稳定的第二阶段;根据氧化膜厚度计算得到的管壁当量温度超过额定蒸汽温度,存在超温现象,但是未超过12Cr1MoVG钢的最高使用温度;根据氧化膜厚度估算的该钢管的剩余使用寿命超过100000 h。Using optical microscope,scanning electron microscope,energy spectrometer,Vickers hardness tester and other equipment,the microstructure analysis,performance test and remaining life assessment of the 12 Cr1 MoVG steel pipe of final reheater of a thermal power unit after 1×10^(5)h service were carried out.The results showed that chemical compositions and mechanical properties of steel pipe met standard requirements,and steel pipe were in a stress safe state.Steel pipe pearlite spheroidization level was 3-4,the alloying elements had produced obvious redistribution phenomenon,and the solid solution alloying elements are obviously depleted.No creep holes were observed,and the creep was in a stable second stage,the equivalent temperature of pipe wall calculated based on oxide scale thickness exceeded the rated steam temperature.There was an over-temperature phenomenon,but it did not exceed the maximum service temperature of 12 Cr1 MoVG steel.The remaining service life of steel pipe estimated based on oxide film thickness exceeded 100000 h.

关 键 词：12CR1MOV钢 显微组织 氧化膜 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]