熊峰, 徐涛龙, 刘颖, 荣恒, 蒋宏业, 李又绿, 迟明华, 韩浩宇. 基于相场法的X80掺氢管道焊缝区双裂纹扩展机理研究[J]. 金属学报, DOI: 10.11900/0412.1961.2025.00390.
, Taolong Xu, , , , , , . Phase-Field Modeling of Double-Crack Propagation Mechanisms in the Weld Zone of X80 Hydrogen-Blended Pipelines[J]. Acta Metall Sin, 0, (): 0-.

摘要 相关文章 Metrics 全文: PDF(1209 KB)   摘要: 掺氢输送是实现氢能规模化运输的重要途径，但临氢服役环境下焊缝区多裂纹的相互作用会显著增加管道失效风险，其耦合扩展机制尚不明确。因此，为阐明H浓度与多裂纹几何构型耦合作用下的失效机制，本工作针对X80管道焊缝区，建立了含内部双裂纹缺陷的数值模型，基于弹塑性断裂相场法揭示了不同H2压力下双裂纹系统的干涉效应与力学特征。基于参数化分析，进一步对比了裂纹倾角、垂直间距及水平间距对裂纹扩展行为和极限承载能力的响应机制。结果表明，与孤立单裂纹相比，双裂纹系统呈现出损伤萌生延迟而失效提前的现象；输送过程中H2压力升高将显著降低材料的断裂韧性与损伤演化阈值，从而诱发焊缝区韧脆转变并显著削弱裂纹扩展阻力，但几何构型主导的裂纹扩展路径并未改变。此外，当裂纹倾角α > 10°时或双裂纹垂直间距与裂纹长度之比b / a > 1.5时会削弱裂纹扩展促进效应，从而提高结构的承载能力；当双裂纹水平间距与裂纹长度之比c / a在1.0~4.5的特定范围时，裂纹扩展促进效应显著增强，且承载能力最不利的工况出现在c / a = 2.5。 关键词 ： 相场法,  X80掺氢管道,  焊缝区,  氢致开裂,  双裂纹扩展机理     Abstract：As the global push for carbon neutrality accelerates, blending hydrogen into natural gas pipelines has become a key strategy for efficient, large-scale hydrogen transportation. However, hydrogen-containing environments pose substantial challenges to the structural integrity of pipelines. As a structural weak point, the weld zone is highly susceptible to premature failure due to hydrogen embrittlement. Inherent welding defects act as initiation sites for cracks. Notably, when multiple defects coexist, their interaction substantially exacerbates the failure risk. Existing research has predominantly focused on single-crack behavior, leaving a gap in understanding the coupled propagation mechanisms of multiple cracks in the weld zone. To address this gap, the present study develops a numerical model of an X80 pipeline weld zone featuring internal double-crack defects. Using the elastic–plastic fracture phase-field method, this study reveals the interference effects and mechanical characteristics of the double-crack system under varying hydrogen pressures. Through parametric analysis, the effects of crack inclination, vertical spacing, and horizontal spacing on crack propagation behavior and ultimate load-bearing capacity are further examined. The results show that, compared with isolated single cracks, the double-crack system exhibits delayed damage initiation but ultimately leads to premature failure. Increased hydrogen pressure significantly degrades the material's fracture toughness and damage evolution threshold, causing a ductile-to-brittle transition in the weld zone and markedly weakening resistance to crack propagation, although the propagation path remains primarily influenced by geometric configuration. In addition, the crack-growth promotion effect diminishes when the crack inclination angle α exceeds 10°. The interaction enters a zero-effect regime when the ratio of double-crack vertical spacing to crack length b / a exceeds 1.5, resulting in enhanced structural load-bearing capacity. By contrast, a notable crack-growth promotion effect is observed when the ratio of double-crack horizontal spacing to crack length c/a ranges from 1.0 to 4.5, with the lowest load-bearing capacity occurring at c / a = 2.5. 收稿日期: 2025-11-28      基金资助:国家自然科学基金项目(52374068) 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 熊峰 徐涛龙 刘颖 荣恒 蒋宏业 李又绿 迟明华 韩浩宇 44.8K 链接本文: https://www.ams.org.cn/CN/10.11900/0412.1961.2025.00390      或      https://www.ams.org.cn/CN/Y0/V/I/0 [1] 王小齐, 张金虎, 郭辉, 李学雄, 许海生, 柏春光, 徐东生, 杨锐. 锆合金氧化膜中相变与裂纹演化的相场模拟[J]. 金属学报, 2025, 61(7): 1082-1092. [2] 张金虎, 许海生, 郭辉, 李学雄, 徐东生, 杨锐. 外加应力下单晶高温合金中 γ' 相筏化的相场模拟[J]. 金属学报, 2025, 61(12): 1911-1924. [3] 余东, 马威龙, 王亚莉, 王锦程. Au-Pt合金凝固-固态相变微观组织演化相场法模拟[J]. 金属学报, 2025, 61(1): 109-116. [4] 刘彩艳, 冯泽华, 张云鹏, 余康, 吴璐, 马聪, 张静. Fe-Cr合金气泡演化动力学的相场法模拟[J]. 金属学报, 2024, 60(9): 1279-1288. [5] 赵宇宏, 景舰辉, 陈利文, 徐芳泓, 侯华. 装甲防护陶瓷-金属叠层复合材料界面研究进展[J]. 金属学报, 2021, 57(9): 1107-1125. [6] 杨柯,史显波,严伟,曾云鹏,单以银,任毅. 新型含Cu管线钢——提高管线耐微生物腐蚀性能的新途径[J]. 金属学报, 2020, 56(4): 385-399. [7] 魏铖, 柯常波, 马海涛, 张新平. 基于序参量梯度的改进相场模型及对大尺度体系马氏体相变的模拟研究[J]. 金属学报, 2018, 54(8): 1204-1214. [8] 王锦程, 郭春文, 李俊杰, 王志军. 定向凝固晶粒竞争生长的研究进展[J]. 金属学报, 2018, 54(5): 657-668. [9] 史显波, 严伟, 王威, 单以银, 杨柯. 新型含Cu管线钢的抗氢致开裂性能[J]. 金属学报, 2018, 54(10): 1343-1349. [10] 张军,陈文雄,郑成武,李殿中. Fe-C-Mn三元合金中奥氏体-铁素体相变的相场模拟[J]. 金属学报, 2017, 53(6): 760-768. [11] 赵小宇, 黄峰, 甘丽君, 胡骞, 刘静. MS X70酸性环境用管线钢焊接接头氢致开裂敏感性及氢捕获效率研究[J]. 金属学报, 2017, 53(12): 1579-1587. [12] 张军,郑成武,李殿中. 相场法模拟Fe-C合金中奥氏体-铁素体等温相变过程*[J]. 金属学报, 2016, 52(11): 1449-1458. [13] 马文婧,柯常波,周敏波,梁水保,张新平. Sn/Cu互连体系界面和金属间化合物层Kirkendall空洞演化和生长动力学的晶体相场法模拟*[J]. 金属学报, 2015, 51(7): 873-882. [14] 赵霞, 查向东, 刘扬, 张龙, 梁田, 马颖澈, 程乐明. 一种新型镍基耐蚀合金与625合金异种金属焊接接头的组织和力学性能*[J]. 金属学报, 2015, 51(2): 249-256. [15] 赵霞, 刘扬, 查向东, 程乐明, 马颖澈, 刘奎. 一种新型镍基耐蚀合金焊接接头的组织与力学性能[J]. 金属学报, 2014, 50(11): 1377-1383. Viewed Full text Abstract Cited   Shared      Discussed