摘要
氢致开裂是高含硫气田集输管网、长输管网管线钢失效的主要模式之一,为明确管道氢致开裂的机理与过程,对其开裂模式进行了研究。对氢质量浓度在金属裂尖扩展过程中的变化规律进行分析,考虑分形效应的影响,对氢致裂纹的动力学模型进行修正,提出了氢致裂纹扩展的直裂纹-剪切带分形模型:在Gerberich对氢致开裂研究的基础上,基于裂尖的氢化作用与裂纹扩展过程中存在的耦合因素,将断裂过程区的形状与裂纹的扩展长度进行结合,构建了氢致开裂裂纹扩展各阶段分形速率的表达式,得到了更为合理的基于分形效应的氢致开裂数学模型。以材质为16Mn和20钢的天然气管道为例,分别计算了母材与焊缝处的氢致裂纹扩展速率,对比得出两种材料抗H2S的性能,研究结果对于高含硫管道材料的选择具有一定指导意义。
Hydrogen induced cracking(HIC) is one of the main failure modes of high-sulfur gas field gathering pipeline network and long-distance pipeline steel. In order to clarify the mechanism and process of pipeline HIC, the cracking mode was studied. The change rule of mass concentration of hydrogen during the propagation of metal crack tip was analyzed, the dynamic model of hydrogen induced crack was corrected with consideration giving to fractal effect, and the straight crackshear band fractal model was proposed for the propagation of hydrogen induced crack. On the basis of Gerberich’s research on HIC, the shape of the fracture process zone and the crack propagation length were combined based on the hydrogenation of crack tip and the coupling factors existing during the crack propagation, the expression of the fractal rate in each stage of the hydrogen induced crack propagation was constructed, and a more reasonable mathematical model of HIC based on the fractal effect was obtained. Taking the natural gas pipeline made of 16 Mn and 20 steel as example, the propagation rate of hydrogen induced crack at the base metal and the weld joint was calculated respectively, and the H2 S resistance of the two materials was obtained by comparison. Therefore, the research results have certain guidance significance for the selection of high-sulfur pipeline materials.
作者
张菁
董绍华
刘冀宁
陈一诺
彭玉杰
伍志明
ZHANG Jing;DONG Shaohua;LIU Jining;CHEN Yinuo;PENG Yujie;WU Zhiming(SINOPEC Northwest Oil Field Company;College of Safety and Ocean Engineering,China University of Petroleum(Beijing);PipeChina Southwest Pipeline Co.Ltd.)
出处
《油气储运》
CAS
北大核心
2021年第2期172-177,共6页
Oil & Gas Storage and Transportation
基金
国家重点研发计划资助项目“国家石油天然气储备库安全保障技术与装备研发”,2017YFC0805800
国家自然科学基金资助项目“X80管线钢氢损伤失效行为与完整性评价模型研究I”,51874322。
关键词
管线钢
氢致开裂
分形效应
扩展速率
失效模式
pipeline steel
hydrogen induced cracking(HIC)
fractal effect
propagation rate
failure mode
作者简介
张菁,女,1976年生,工程师,2007年硕士毕业于西南石油大学计算机应用技术专业,现主要从事油气集输及管道完整性方面的研究工作。地址:新疆乌鲁木齐市新市区长春南路466号,830011。电话:15999191712。Email:zj7707@vip.qq.com。
