Hydrogen-Induced Cracking Resistance of Novel Cu-Bearing Pipeline Steels
Shi Xianbo; Yan Wei; Wang Wei; Shan Yiyin; Yang Ke
Corresponding AuthorYang Ke(
AbstractHydrogen-induced cracking (HIC) resistance of pipeline steels is one of the most important properties for sour gas service pipelines. For the conventional pipeline steels, the strength level mainly depends on the Mn content. However, as the Mn content increases, the unfavorable microstructures such as large size martensite/austenite (M/A) islands, bainite or martensite will be generated, which will deteriorate the HIC resistance of the steels. Therefore, it is hard to simultaneously improve strength level and HIC resistance for pipeline steel. The nature of HIC in pipeline steel is hydrogen embrittlement, which is essentially the redistribution of H atoms into the matrix of steel. So, how to make the distribution of H atoms in the steel as evenly as possible without causing local enrichment is a key factor to improve the HIC of pipeline steels. In this work, the susceptibilities of HIC of traditional X80 and novel Cu-bearing pipeline steels were studied with comparison. The results showed that the X80 pipeline steel behaved bad HIC resistance. The hydrogen-induced cracks mainly expanded along the interface between M/A islands and the matrix. However, the novel Cu-bearing pipeline steels with different Cu contents exhibited excellent HIC resistance, showing no cracks were produced after HIC test. It was analyzed that nanosized Cu-rich precipitates in the Cu-bearing pipeline steels are speculated to act as the beneficial hydrogen traps, and these uniformly dispersed fine Cu-rich phases in matrix provide many sites for the distribution of H atoms, which helps to avoid the localized high concentration H atoms enrichment leading to hydrogen embrittlement. Taking nano-sized Cu-rich phases as a type of beneficial hydrogen traps provides a new way for the development of new pipeline steels with high strength and excellent HIC resistance.
Keywordpipeline steel Cu hydrogen-induced cracking Cu-rich phase hydrogen trap
Funding OrganizationShenyang Science and Technology Research Funding
Indexed BySCI
Funding ProjectShenyang Science and Technology Research Funding[18-013-0-53]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000446009000001
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorYang Ke
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Shi Xianbo,Yan Wei,Wang Wei,et al. Hydrogen-Induced Cracking Resistance of Novel Cu-Bearing Pipeline Steels[J]. ACTA METALLURGICA SINICA,2018,54(10):1343-1349.
APA Shi Xianbo,Yan Wei,Wang Wei,Shan Yiyin,&Yang Ke.(2018).Hydrogen-Induced Cracking Resistance of Novel Cu-Bearing Pipeline Steels.ACTA METALLURGICA SINICA,54(10),1343-1349.
MLA Shi Xianbo,et al."Hydrogen-Induced Cracking Resistance of Novel Cu-Bearing Pipeline Steels".ACTA METALLURGICA SINICA 54.10(2018):1343-1349.
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