Numerical Simulation of Hydrogen Diffusion in X80 Welded Joint Under the Combined Effect of Residual Stress and Microstructure Inhomogeneity

doi:10.11900/0412.1961.2018.00060

Acta Metall Sin

2019, Vol. 55

Issue (2): 258-266 DOI: 10.11900/0412.1961.2018.00060

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Numerical Simulation of Hydrogen Diffusion in X80 Welded Joint Under the Combined Effect of Residual Stress and Microstructure Inhomogeneity

Timing ZHANG^1,², Weimin ZHAO¹(

), Wei JIANG¹, Yonglin WANG¹, Min YANG¹

1 School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China
2 School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China

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Timing ZHANG, Weimin ZHAO, Wei JIANG, Yonglin WANG, Min YANG. Numerical Simulation of Hydrogen Diffusion in X80 Welded Joint Under the Combined Effect of Residual Stress and Microstructure Inhomogeneity. Acta Metall Sin, 2019, 55(2): 258-266.

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Abstract

Welded joints of hydrogen-containing coal gas transmission pipelines are prone to hydrogen enrichment due to their severe microstructure inhomogeneity and residual stress in them, and thus lead to the decrease of plasticity and toughness. In order to investigate the effect of local hydrogen enrichment on the safety of hydrogen-containing coal gas transport pipelines, a three dimensional numerical simulation model was established to investigate the hydrogen diffusion behaviour considering the combined effect of microstructure inhomogeneity and residual stress in X80 spiral welded pipeline by using ABAQUS software. Results showed that both microstructure inhomogeneity and residual stress could lead to hydrogen diffusion. The distribution of hydrogen concentration in the pipeline was similar to that of hydrostatic stress distribution. That is, the higher the hydrostatic stress value, the higher the corresponding hydrogen concentration, indicating that the influence of residual stress on the hydrogen diffusion behaviour is greater than that of microstructure inhomogeneity. The enriched hydrogen concentration at the center region of the welded joint with the highest residual stress was 2.7 times higher than that without considering residual stress. Equivalent charging hydrogen pressure was put forward to reflect the degree of hydrogen enrichment in weld metal. Slow strain rate tension (SSRT) tests were subsequently performed on weld metal specimen at equivalent charging hydrogen pressure to investigate the effect of hydrogen enrichment on hydrogen embrittlement (HE) susceptibility. The SSRT tests performed in nitrogen gas and simulated coal gas were used for comparison. The HE index increased from 18.56% in simulated coal gas to 32.53% in equivalent charging hydrogen pressure, increasing by 75.27%. Therefore, the residual stress is a non-ignorable factor, because it could lead to hydrogen enrichment and could significantly influence HE susceptibility in welded joint. The determination of hydrogen enrichment in welded joint by using numerical simulation method is the basis to evaluate the safety of coal gas transmission pipeline.

Key words: X80 pipeline steel coal gas welded joint residual stress hydrogen enrichment

Received: 07 February 2018

ZTFLH:

TE88

Fund: Supported by National Natural Science Foundation of China (No.51705535), China Postdoctoral Science Foundation (No.2016M602218) and Natural Science Foundation of Shandong Province (No.ZR2017MEE005)

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	Timing ZHANG
	Weimin ZHAO
	Wei JIANG
	Yonglin WANG
	Min YANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00060 OR https://www.ams.org.cn/EN/Y2019/V55/I2/258

Table 1 Welding materials and parameters of spiral welded pipe

Fig.1 Morphology and dimension of welded joint (unit: mm)

Fig.2 Hydrogen permeation curves of different sub-regions of welded joint (ICHAZ—intercritical heat affected zone, FGHAZ—fine grained heat affected zone, CGHAZ—coarse grained heat affected zone)

Table 2 Hydrogen diffusion parameters of different sub-regions of welded joint

Fig.3 3D model of pipeline with mesh division
(a) overall morphology (b) magnification of welded joint

Table 3 Mechanical properties of X80 pipeline steel at different temperatures

Fig.4 Cross-sectional macrographs of real (a, c) and simulated (b, d) welded joints
(a, b) inner weld (c, d) outer weld

Fig.5 Stress distributions in welded pipeline
(a) overall morphology
(b) magnification of welded joint with mesh division
(c) residual stress distribution curves along line A in Fig.5b

Fig.6 Hydrogen concentration distributions in X80 welded pipeline
(a) without residual stress
(b) with residual stress
(c) hydrogen distribution along line A in Figs. 6a and b

Table 4 The hydrogen enrichment at different sub-regions of welded joint

Fig.7 Stress-strain curves of weld metal in different environments

Table 5 Mechanical properties of weld metal in different environments

Fig.8 Low (a~c) and high (d~f) magnified fracture SEM images of weld metal in nitrogen gas (a, d), coal gas (b, e) and equivalent charging hydrogen (c, f) environments

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