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

doi:10.11901/1005.3093.2022.584

Chinese Journal of Materials Research

2023, Vol. 37

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

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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

Cite this article:

ZHAO Hai, XIONG Shiqi, LIU Enze, TIAN Chengchuan, LI Xiaohui, WANG Weilin. Microstructure and Tensile Deformation Behavior of Welded Joints of P91 Steel for Steam Pipeline in Long-term Service. Chinese Journal of Materials Research, 2023, 37(11): 837-845.

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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

Received: 04 November 2022

ZTFLH:

TG407

Fund: National Natural Science Foundation of China(51871043);Key Projects of Huadian Electric Power Research Institute(CHDKJ20-01-92)

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

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	ZHAO Hai
	XIONG Shiqi
	LIU Enze
	TIAN Chengchuan
	LI Xiaohui
	WANG Weilin

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.584 OR https://www.cjmr.org/EN/Y2023/V37/I11/837

Fig.1 Macroscopic morphology of P91 steel pipe joint in long-term online service at high temperature

Table 1 Chemical composition of P91 base metal of non-service steel pipe and each area of steel pipe joint in service (mass fraction,%)

Fig.2 Hardness distribution of P91 steel pipe joint in long-term online service at high temperature

Fig.3 Microstructure in base metal of non-service steel pipe and steel pipe joint in long-term online service at high temperature: (a) NBM, (b) BM, (c) SHAZ, (d) WZ, (e) BHAZ

Fig.4 Room temperature tensile property in base metal of non-service steel pipe and each area of steel pipe joint in service: (a) strength, (b) elongation

Fig.5 room temperature tensile stress-stain curve of base metal of non-service steel pipe and each area of steel pipe joint in service during

Fig.6 High temperature tensile property of base metal of non-service steel pipe and each area of steel pipe joint in service (a) strength, (b) elongation

Fig.7 High temperature tensile stress-strain curve of base metal of non-service steel pipe and each area of steel pipe joint in service during

Fig.8 Room temperature tensile fracture morphology of base metal of non-service steel pipe and each area of steel pipe joint in service (a) NBM, (b) BM, (c) SHAZ, (d) WZ, (e) BHAZ

Fig.9 High temperature tensile fracture morphology in base metal of non-service steel pipe and each area of steel pipe joint in service (a) NBM, (b) BM, (c) SHAZ, (d) WZ, (e) BHAZ

Fig.10 Scanning electron microscope morphology of carbides in base metal of non-service steel pipe and each area of steel pipe joint in service (a) NBM, (b) BM, (c) SHAZ, (d) WZ, (e) BHAZ

Fig.11 Transmission electron microscope morphology of carbides in base metal of non-service steel pipe and each area of steel pipe joint in service (a) NBM, (b) BM, (c) SHAZ, (d) WZ, (e) BHAZ

Fig.12 Morphology and composition of carbides in base metal of non-service steel pipe and weld zone of steel pipe joint in service (a, b) NBM, (c, d) WZ

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