X80管线钢氢渗透行为及氢脆敏感性研究  

Hydrogen Permeation and Hydrogen Embrittlement Sensitivity of X80 Pipeline Steel

作　　者：陈锴 杜一帆 徐浩昀 吕良 党桂铭 王玉金 郑树启[1] CHEN Kai;DU Yifan;XU Haoyun;LV Liang;DANG Guiming;WANG Yujin;ZHENG Shuqi(College of New Energy and Materials,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)新能源与材料学院,北京102249

出　　处：《中国腐蚀与防护学报》2025年第2期388-396,共9页Journal of Chinese Society For Corrosion and Protection

摘　　要：研究了不同厚度的X80管线钢在电化学充氢条件下的氢渗透行为及预充氢时间对材料力学性能的影响,并通过有限元分析对不同预充氢时间下材料内部的氢浓度进行了模拟。结果表明,随着试样厚度增加,X80管线钢的稳态电流密度和氢扩散通量减小,穿透和滞后时间增加,表明增大试样厚度增加了材料内部的氢陷阱数量和氢扩散路径。此外,预充氢对材料的氢脆敏感性影响显著,表现为屈服强度的提升和延伸率的下降。断口形貌表明,原位充氢慢拉伸的试样脆性断裂特征明显,韧性断裂特征随预充氢时间增加而减少,这是由于材料内部的氢原子浓度增加造成的。The hydrogen permeation behavior of X80 pipeline steel with different thicknesses was studied by means of electrochemical hydrogen permeation test,and the influence of hydrogen pre-charging time on the mechanical properties of X80 pipeline steel was also assessed via slow strain rate tensile test.Meanwhile,finite element analysis was used to simulate hydrogen concentration within the steels,which were hydrogen pre-charged for different times.The results indicate that as the thickness increases,the steady-state current density and steady-state hydrogen permeation flux of X80 pipeline steel decrease.Moreover,the penetration time and lag time of hydrogen diffusion increase,suggesting that the increase in steel thickness enhances both the quantity of hydrogen traps and the pathways for hydrogen diffusion of the steel.Additionally,pre-charging time significantly impacts the susceptibility to hydrogen embrittlement of the steel,resulting in a slight increase in yield strength and a notable decrease in elongation with the increasing pre-charging time.Macroscopic and microscopic fracture surface analyses reveal that steels subjected to in-situ hydrogen charging exhibit distinct brittle fracture characteristics.As the precharging time increases,the ductile fracture features diminishing,while the number of secondary cracks increased gradually,which may be attributed to the increased concentration of hydrogen atoms within the steel.The fitting results show that the internal hydrogen concentration is negatively correlated with the elongation and positively correlated with hydrogen embrittlement sensitivity.

关 键 词：X80管线钢 氢渗透 原位充氢拉伸 氢脆敏感性 有限元仿真 

分 类 号：TG174[金属学及工艺—金属表面处理]