Characterization of quasi-cleavage fracture of pre-strained X80 pipeline steel subjected to SSRT tests in gas hydrogen

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2025-01-22 DOI:10.1016/j.ijpvp.2025.105448

Shiyao Peng , Yan-Hui Zhang , Chong Chai , Yebin Pei , Daowu Zhou , Can Tian

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Abstract

Most hydrogen embrittlement (HE) mechanisms involve interaction between hydrogen and dislocations. The interaction depends on dislocation density and time for hydrogen to diffuse. This study investigated the HE behaviour and determined the cleavage cracking characteristics of an X80 pipeline steel by carrying out slow strain rate tensile (SSRT) tests on specimens with different levels of pre-strain and at different strain rates in gaseous hydrogen and examination of the cracking and fracture and characteristics. Pre-straining history and a slower strain rate increased the tendency of the pipeline steel to HE. The current detailed fractographic examination of the tested specimens revealed that cracking occurred on the {112} and {110} slip planes in this pipeline steel. The terrace morphology was observed on the fracture surfaces and nearly parallel crystallographic cracks on the side surfaces. They were attributed to hydrogen promoted dislocation mobility on localized and preferred slip systems. Coalescence of these discrete cracks led to quasi-cleavage fracture of the specimens.

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预应变X80管线钢在气体氢中SSRT试验的准解理断裂特征

大多数氢脆（HE）机制涉及氢和位错之间的相互作用。这种相互作用取决于位错密度和氢扩散的时间。本研究通过对不同预应变水平和不同应变速率下的X80管线钢试样进行慢应变速率拉伸（SSRT）试验，研究了其HE行为，并确定了解理开裂特征。预应变历史和较慢的应变速率增加了管道钢的HE倾向。目前对测试试样进行的详细断口学检查显示，该管道钢的{112}和{110}滑移面发生了开裂。断口表面呈阶地形貌，断口侧面呈近似平行的结晶裂纹。这是由于氢促进了位错在局部滑移体系和优选滑移体系上的迁移。这些离散裂纹的合并导致了试样的准解理断裂。

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.