首页|Molecular dynamics study of hydrogen-induced cracking behavior of ferrite-pearlite gas transmission pipeline steel

Molecular dynamics study of hydrogen-induced cracking behavior of ferrite-pearlite gas transmission pipeline steel

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Hydrogen embrittlement of pipelines depends on the hydrogen-induced cracking behavior of the pipeline steel microstructure.Based on molecular dynamics analysis,the ferrite-cementite(α-Fe/Fe3C)lamellar atomic structure with the Bagaryatskii orientation relationship was established,and stepwise relaxation of the conjugate gradient energy mini-mization and constant-temperature and constant-pressure relaxation were performed under NPT(the isothermal-isobaric)conditions.The mechanical property curves of the α-Fe/Fe3C models were obtained under different cementite terminal plane structures,and the evolution of the atomic structure was analyzed in detail.In addition,the influence of different hydrogen concentrations,different temperatures,different strain rates,changes in voids,and different micro-degrees of freedom on the deformation and failure mechanism of the model was investigated,aiming to provide a reliable way to explore the micro-mechanism of macro-cracking behavior of pipeline steel.

Ferrite-cementite lamellar structurePipeline steelFailure mechanismCrack propagationMolecular dynamics

Tao-long Xu、Si-han Guo、Gong-zhen He、Hao-yu Han

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Petroleum Engineering School,Southwest Petroleum University,Chengdu 610500,Sichuan,China

Sichuan East Gas Transmission Sales Center of Sinopec Natural Gas Branch,Wuhan 430074,Hubei,China

Scientific and Technological Innovation Team for the Safety of Petroleum Tubular Goods at the Southwest Petroleum University"The Young Scholars"Development Fund of the Southwest Petroleum University of China

2018CXTD01

2024

10.1007/s42243-023-01026-z

钢铁研究学报(英文版)
钢铁研究总院

钢铁研究学报(英文版)

CSTPCD
影响因子：0.584
ISSN：1006-706X
年,卷(期)：2024.31(2)
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