辽宁石油化工大学学报 ›› 2025, Vol. 45 ›› Issue (6): 19-27.DOI: 10.12422/j.issn.1672-6952.2025.06.003

• 材料科学与新能源(氢能技术研究) • 上一篇    下一篇

铁素体⁃珠光体型管线钢氢致裂纹扩展行为的多尺度机理研究

荣恒1(), 徐涛龙1(), 吉青山2, 韩浩宇3, 刘立杰1, 熊峰1   

  1. 1.西南石油大学 石油与天然气工程学院,四川 成都 610500
    2.中国石油天然气股份有限公司大港油田分公司 第三采油厂,河北 沧州 061000
    3.中国航空油料有限责任公司 重庆分公司,重庆 400000
  • 收稿日期:2025-06-10 修回日期:2025-07-15 出版日期:2025-12-25 发布日期:2025-12-07
  • 通讯作者: 徐涛龙
  • 作者简介:荣恒(2002⁃),男,硕士研究生,从事材料失效的多尺度分析方面的研究;E⁃mail:2865068714@ qq.com
  • 基金资助:
    国家自然科学基金面上项目(52374068)

Multi⁃Scale Mechanism Study on Hydrogen⁃Induced Crack Growth Behavior of Ferrite⁃Pearlite Pipeline Steel

Heng RONG1(), Taolong XU1(), Qingshan JI2, Haoyu HAN3, Lijie LIU1, Feng XIONG1   

  1. 1.School of Petroleum and Natural Gas Engineering,Southwest Petroleum University,Chengdu Sichuan 610500,China
    2.Dagang Oilfield Branch Third Oil Production Plant,PetroChina Co. ,Ltd. ,Cangzhou Hebei 061000,China
    3.Chongqing Branch,China Aviation Fuel Co. ,Ltd. ,Chongqing 400000,China
  • Received:2025-06-10 Revised:2025-07-15 Published:2025-12-25 Online:2025-12-07
  • Contact: Taolong XU

摘要:

揭示高强管线钢微细观尺度氢致裂纹扩展机理,对保障氢能运输安全具有重要的工程价值。针对铁素体-珠光体型管线钢中铁素体(α-Fe)与渗碳体(Fe3C)共析形成的珠光体组织,建立具有Bagaryatskii晶相关系的铁素体-渗碳体界面模型,结合Voronoi多边形多晶模型与内聚力模型,系统分析了氢原子数分数、晶粒尺度、渗碳体终止面对管线钢临氢力学性能的影响。结果表明,在微观尺度下,随着氢原子数分数的增加,管线钢的临界界面张力明显降低,相较于无氢模型,氢原子数分数为2.5%和5.0%的模型的临界界面张力分别降低了约3.10%和7.50%,断裂能同样表现出下降趋势,渗碳体终止面按抗裂性能排序为C-Fe>C-C>Fe-Fe>Fe-C;在细观尺度下,与无氢模型相比,当氢原子数分数增加到5.0%时,临界应力强度因子(KIC)下降8.39%,裂纹长度增加12.06%,当平均晶粒面积从16 μm2细化至4 μm2时,KIC上升31.38%,裂纹长度缩短17.30%,且终止面影响规律与微观结果一致。研究结果可为临氢环境下铁素体?珠光体型管线钢的本质安全评价及其适应性分析提供理论参考。

关键词: 铁素体?珠光体型管线钢, 铁素体?渗碳体界面, 氢原子数分数, 内聚力模型, 多尺度机理

Abstract:

Revealing the micro-and meso-scale hydrogen?induced crack propagation mechanism of high-strength pipeline steel holds significant engineering value for ensuring the safety of hydrogen energy transportation. In this study, a ferrite-cementite interface model with Bagaryatskii crystallographic relationship was established for the pearlite structure formed by eutectoid ferrite (α-Fe) and cementite (Fe3C) in ferrite?pearlite pipeline steel. Combined with Voronoi polygon polycrystalline model and cohesive zone model, the effects of hydrogen atom number fractions, grain size and cementite termination surface on the mechanical properties of pipeline steel in a hydrogen environment were systematically analyzed. The results indicate that at the micro scale, with the increase of hydrogen atom number fractions, the critical interfacial tension of pipeline steel decreases obviously, which decreases by about 3.10% and 7.50% respectively at 2.5% and 5.0% hydrogen atom number fractions, and the fracture energy also shows a downward trend. The order of cementite termination surface according to crack resistance is C-Fe > C-C > Fe-Fe > Fe-C. At the meso-scale, the increase of hydrogen atom number fractions (5.0%) leads to a decrease of 8.39% in the critical stress intensity factor(KIC) and an increase of 12.06% in the crack length. When the grain size is refined from 16 μm2 to 4 μm2, the KIC increases by 31.38% and the crack length decreases by 17.30%. The influence of the termination surface is consistent with the microscopic results. This research provides a theoretical reference for the intrinsic safety evaluation and adaptability analysis of ferrite?pearlite pipeline steel in hydrogen environment.

Key words: Ferrite?pearlite pipeline steel, Ferrite?cementite interface, Hydrogen atom number fractions, Cohesion model, Multi?scale mechanism

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引用本文

荣恒, 徐涛龙, 吉青山, 韩浩宇, 刘立杰, 熊峰. 铁素体⁃珠光体型管线钢氢致裂纹扩展行为的多尺度机理研究[J]. 辽宁石油化工大学学报, 2025, 45(6): 19-27.

Heng RONG, Taolong XU, Qingshan JI, Haoyu HAN, Lijie LIU, Feng XIONG. Multi⁃Scale Mechanism Study on Hydrogen⁃Induced Crack Growth Behavior of Ferrite⁃Pearlite Pipeline Steel[J]. Journal of Liaoning Petrochemical University, 2025, 45(6): 19-27.

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链接本文: https://journal.lnpu.edu.cn/CN/10.12422/j.issn.1672-6952.2025.06.003

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