辽宁石油化工大学学报2025，Vol.45Issue(6)：19-27,9.DOI:10.12422/j.issn.1672-6952.2025.06.003
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
Multi-Scale Mechanism Study on Hydrogen-Induced Crack Growth Behavior of Ferrite-Pearlite Pipeline Steel
摘要
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.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Key words
Ferrite-pearlite pipeline steel/Ferrite-cementite interface/Hydrogen atom number fractions/Cohesion model/Multi-scale mechanism分类
能源科技引用本文复制引用
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):19-27,9.基金项目
国家自然科学基金面上项目(52374068). （52374068）
