长期服役<strong>P91</strong>钢蒸汽管道接头的显微组织和拉伸变形行为

doi:10.11901/1005.3093.2022.584

材料研究学报

2023, Vol. 37

Issue (11): 837-845 DOI: 10.11901/1005.3093.2022.584

研究论文

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长期服役P91钢蒸汽管道接头的显微组织和拉伸变形行为

赵海¹, 刘恩泽²(

), 熊诗琪², 田成川¹, 郦晓慧¹, 王巍麟¹

^1.华电电力科学研究院有限公司杭州 310030
^2.中国科学院金属研究所沈阳 110016

Microstructure and Tensile Deformation Behavior of Welded Joints of P91 Steel for Steam Pipeline in Long-term Service

ZHAO Hai¹, XIONG Shiqi²(

), LIU Enze², TIAN Chengchuan¹, LI Xiaohui¹, WANG Weilin¹

^1.Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

赵海, 刘恩泽, 熊诗琪, 田成川, 郦晓慧, 王巍麟. 长期服役P91钢蒸汽管道接头的显微组织和拉伸变形行为[J]. 材料研究学报, 2023, 37(11): 837-845.
Hai ZHAO, Shiqi XIONG, Enze LIU, Chengchuan TIAN, Xiaohui LI, Weilin WANG. Microstructure and Tensile Deformation Behavior of Welded Joints of P91 Steel for Steam Pipeline in Long-term Service[J]. Chinese Journal of Materials Research, 2023, 37(11): 837-845.

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摘要:

观察服役136000 h的P91钢管接头不同部位(母材、热影响区、焊缝)的显微组织并测量其拉伸变形行为，与未服役的P91钢母材对比研究了长期服役P91钢接头的组织老化和力学性能的退化及其机制。结果表明，可用硬度判定在线服役的P91钢管接头组织的老化和力学性能的退化。与未服役钢管比较，长期服役钢管的焊接接头各区域马氏体的分解和碳化物的粗化，使马氏体强化、沉淀强化和固溶强化的效果明显降低，使各区域的硬度、室温和高温拉伸性能退化。在长期服役过程中焊缝区域的硬度、室温和高温拉伸性能其退化最为显著。服役前焊接过程中产生的热循环严重回火和长期高温服役的耦合作用，是P91钢管焊缝力学性能显著退化的重要原因。

关键词 ：金属材料, 长期服役P91钢接头, 焊缝, 热影响区, 显微组织, 拉伸变形行为

Abstract：

The microstructure and tensile deformation behavior of different zones (base metal, heat affected zone and weld zone) of joints of P91 steel pipe before after 136000 hours of service as steam pipeline were comparatively studied by means of hardness tester, tensile tests at 25 and 545℃, metalloscopy, SEM and TEM+EDS etc. The results show that the hardness test results can reflect the degradation behavior of tensile properties and the aging process of P91 steel joints. Compared with non-service steel pipes, the martensite decomposition and carbide coarsening behavior in each zone of welded joints of long-term serviced steel pipes obviously weaken the effect of martensite strengthening, precipitation strengthening and solution strengthening, and finally lead to the degradation of hardness, tensile properties at room temperature and high temperature in each zone. Among others, the hardness of weld zone and the relevant room temperature- and high temperature-tensile properties are most significantly degraded due to long-term service. The synergistic effect of the thermal cycling induced severe tempering during welding process with the long-term high temperature service may be an important cause for the significant degradation of the mechanical properties of P91 steel pipe welds.

Key words： metallic materials P91 steel joint in long-term service weld zone heat affected zone microstructure tensile deformation behavior

收稿日期: 2022-11-04

ZTFLH:

TG407

基金资助:国家自然科学基金(51871043);华电电力科学研究院重点项目(CHDKJ20-01-92)

通讯作者: 刘恩泽，研究员，nzliu@imr.ac.cn，研究方向为高温结构材料

Corresponding author: LIU Enze, Tel: (024)23971143, E-mail: nzliu@imr.ac.cn

作者简介: 赵海，男，1980年生，硕士

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图1 长期高温在线服役P91钢管接头的宏观形貌

表1 未服役钢管母材和服役钢管接头各区域的化学成分

图2 长期高温在线服役P91钢管接头的硬度分布

图3 未服役钢管母材和高温长期在线服役钢管接头各区域的显微组织

图4 未服役钢管母材和服役钢管接头各区域的室温拉伸性能

图5 未服役钢管母材和服役钢管接头各区域室温拉伸的应力-应变曲线

图6 未服役钢管母材和服役钢管接头各区域的高温拉伸性能

图7 未服役钢管母材和服役钢管接头各区域的高温拉伸应力-应变曲线

图8 未服役钢管母材和服役钢管接头各区域室温拉伸断口的形貌

图9 未服役钢管母材和服役钢管接头各区域的高温拉伸断口形貌

图10 未服役钢管母材和服役钢管接头各区域碳化物的扫描电镜形貌

图11 未服役钢管母材和服役钢管接头各区域碳化物的透射电镜形貌

图12 未服役钢管母材和服役钢管接头焊缝处碳化物的形貌和成分

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