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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (2): 416-422    DOI: 10.11902/1005.4537.2024.079
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Hydrogen Embrittlement Sensitivity for Welded Structural Parts of DH36 Marine Engineering Steel
LI Xincheng1, LI Zhaonan1, WANG Haifeng1, XU Yunze1,2(), WANG Mingyu1, ZHEN Xingwei1
1.School of Naval Engineering, Dalian University of Technology, Dalian 116024, China
2.National Key Laboratory of Industrial Equipment Structural Analysis and Optimization and CAE Software, Dalian 116024, China
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LI Xincheng, LI Zhaonan, WANG Haifeng, XU Yunze, WANG Mingyu, ZHEN Xingwei. Hydrogen Embrittlement Sensitivity for Welded Structural Parts of DH36 Marine Engineering Steel. Journal of Chinese Society for Corrosion and protection, 2025, 45(2): 416-422.

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Abstract  

The hydrogen embrittlement sensitivity of different welded structures of DH36 marine engineering steel was comparatively studied via hydrogen diffusion measurement and slow strain rate tests (SSRT). The results show that the hydrogen diffusion coefficient is the highest for the heat-affected zone, followed by the weld zone, and the base metal zone is the lowest. The hydrogen embrittlement coefficient is the highest for the heat-affected zone, and obvious hydrogen embrittlement can be observed in the heat-affected zone by an applied polarization potential of -950 mV, while the base metal and weld zone exhibit hydrogen embrittlement characteristics only when the cathodic protection potential of -1050 mV was applied. The results indicate that the heat-affected zone has higher hydrogen embrittlement sensitivity than the weld zone, however, the weld zone has higher sensitivity than the base metal zone.
Key words:  DH36 steel      hydrogen embrittlement      heat affected zone      hydrogen permeation      slow strain rate tests (SSRT)      cathodic protection     
Received:  11 March 2024      32134.14.1005.4537.2024.079
:  TG174  
Fund: National Natural Science Foundation of China(52001055)
Corresponding Authors:  XU Yunze, E-mail: xuyunze123@163.com
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LI Xincheng
LI Zhaonan
WANG Haifeng
XU Yunze
WANG Mingyu
ZHEN Xingwei

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.079     OR     https://www.jcscp.org/EN/Y2025/V45/I2/416

Fig.1  Microstructures of the base metal (a), heat-affected zone (b) and welding metal (c)
Fig.2  Schematic diagrams of sample shape (a) and sampling areas (b)
Fig.3  Tensile testing device
Fig.4  Schematic diagram of electrochemical hydrogen charging device
Fig.5  Hydrogen permeation curves of the welding metal,heat-affected zone and base metal
ZoneI∞ / mA·cm-2D / cm2·s-1J / mol[H]·cm-2·s-1C0 / mol·cm-3NT
Base metal7.58.33 × 10-67.77 × 10-119.33 × 10-72.69 × 1019
Heat-affected zone10.21.28 × 10-51.06 × 10-108.25 × 10-71.49 × 1019
Welding metal9.11.19 × 10-59.43 × 10-117.92 × 10-71.55 × 1019
Table 1  Hydrogen diffusion parameters of the welding metal, heat-affected zone, and base metal
Fig.6  Stress-strain curves of the base metal (a), welding metal (b) and heat-affected zone (c) at different potentials, and their elongation curves (d)
Fig.7  Macroscopic morphologies of fracture surfaces of the base metal (a), heat-affected zone (b) and welding metal (c) with 0 mV (a1-c1), -850 mV (a2-c2), -950 mV (a3-c3), -1050 mV (a4-c4) and -1150 mV (a5-c5)
Fig.8  Hydrogen embrittlement coefficients of the welding metal, heat-affected zone and base metal
Fig.9  Microscopic morphologies of fracture surfaces of the base metal (a), heat-affected zone (b) and welding metal (c) with 0 mV (a1-c1), -850 mV (a2-c2), -950 mV (a3-c3), -1050 mV (a4-c4) and -1150 mV (a5-c5) after tensile test at different potentials
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