掺氢环境中在役X60管线钢氢脆和疲劳性能研究  

Study on the Hydrogen Embrittlement and Fatigue Performance of In-Service X60 Pipeline Steel in Hydrogen-Blended Environments

作　　者：费凡 魏仁超 杨志文 冯敏 王修云 FEI Fan;WEI Renchao;YANG Zhiwen;FENG Min;WANG Xiuyun(National Pipeline Network Beijing Pipeline Co.,Ltd.,Beijing 122000,China;Safetech Research Institute(Beijing)Co.,Ltd.,Beijing 102209,China)

机构地区：[1]国家管网集团北京管道有限公司,北京122000 [2]安科工程技术研究院(北京)有限公司,北京102209

出　　处：《材料保护》2025年第3期147-154,共8页Materials Protection

摘　　要：随着在役天然气管道掺氢输送在氢能利用发展需求中的日趋迫切,在役管道材料将面临在氢气环境中运行的安全风险。为研究在役天然气管道在掺氢输送条件下的氢脆性能,以某在役天然气管道X60管线钢为研究对象,开展了管线钢在氢气环境中的慢应变速率拉伸测试及疲劳裂纹扩展测试,分析了氢对管材拉伸性能及疲劳性能的影响。结果表明:在总压6.4 MPa、掺氢比为5%的条件下,在役弯管X60钢的氢脆敏感性均较低,断口基本呈韧性断裂特征,5%的掺氢比不影响其断裂特征;而在同样的掺氢环境中,X60管线钢的疲劳裂纹扩展速率则受氢环境和裂纹尖端应力强度因子范围的影响,当应力强度因子范围高于某个特定值时,X60管线钢的疲劳裂纹扩展速率急剧增大,疲劳裂纹扩展模式由裂纹尖端塑性变形机制主导的韧性断裂转变为氢和循环载荷协同作用下脆性与韧性的混合断裂。X60弯管母材的氢脆敏感性和疲劳性能都将作为在役天然气管道掺氢输送的关键评价指标。With the increasing urgency of hydrogen blending transportation in in-service natural gas pipelines in the development demand of hydrogen energy utilization,in-service pipeline materials will face the safety risk of running in hydrogen environment.To investigate the hydrogen embrittlement properties of in-service natural gas pipelines under hydrogen blending conditions,the slow strain rate tensile test and fatigue crack growth test of pipeline steel in hydrogen environment were carried out on X60 pipeline steel of an in-service natural gas pipeline,the effect of hydrogen on the tensile and fatigue properties of the tube was analyzed.The results indicated that under a total pressure of 6.4 MPa and a hydrogen blending ratio of 5%,the hydrogen embrittlement sensitivity of the in-service X60 pipe was relatively low,with fractures exhibiting mostly ductile fracture characteristics.The 5%hydrogen blending ratio did not affect the fracture characteristics.In the same hydrogen blending environment,however,the fatigue crack growth rate of X60 pipeline steel was influenced by the hydrogen environment and the stress intensity factor range at the crack tip.When the stress intensity factor range exceeded a certain threshold,the fatigue crack growth rate of X60 pipeline steel increased dramatically.The fatigue crack growth mode transitioned from ductile fracture dominated by plastic deformation at the crack tip to a mixed fracture of brittle and ductile fracture under the combined effects of hydrogen and cyclic loading.The hydrogen embrittlement sensitivity and fatigue performance of the X60 bend pipe material will be key evaluation indicators for hydrogen blended natural gas transportation in in-service pipelines.

关 键 词：X60管线钢 掺氢 慢应变速率拉伸测试 氢脆敏感性 疲劳裂纹扩展 

分 类 号：TG142.1[一般工业技术—材料科学与工程]