Investigation of hydrogen embrittlement in welded joints of the L360MH pipeline steel for hydrogen transportation

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-04-12 DOI:10.1016/j.corsci.2025.112940

Jiayu Bai , Min Zhang , Hongwei Ma , Zhaoxu Li , Wei Mao , Jihong Li , Jianxun Zhang

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引用次数: 0

Abstract

In order to evaluate the susceptibility to hydrogen embrittlement(HE) of the L360MH hydrogen transportation pipeline, through electrochemical hydrogen charging (H-charging), mechanical property tests, microstructures and fracture analysis, the longitudinal and girth weld of the straight seam welding pipeline was assessed carefully. The conclusions indicate that both submerged arc welding (SAW) welded joint and tungsten inert-gas welding (TIG) welded joint exhibit high-strength matching characteristics, the strength of the SAW welded joint is about 10 % higher than that of the base metal (BM), while the strength of the (TIG) welded joint has increased by about 17 %, softening was observed in the heat-affected zone (HAZ) of the SAW welded joint, with about 9 % reduction in tensile strength compared to the BM. Upon H-charging, the HAZ of welded joints demonstrate a heightened susceptibility to HE. In contrast, the susceptibility to HE of the BM is nearly identical to that of the weld metal (WM), while the HAZ of the TIG welded joint is more susceptible to HE than the SAW welded joint. It has been found that there is a positive correlation between the quantity of low-angle grain boundaries (LAGBs), Kernel Average Misorientation (KAM), and the susceptibility to HE within the microstructure of welded joints. The fracture surface of the WM and HAZ of welded joints after H-charging exhibits a "fish-eye" river pattern with inclusions in the center area, as well as tear ridges and cleavage steps among other patterns.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.