摘要
针对制造加氢反应器的主要材料2.25Cr-1Mo钢易发生氢脆问题,通过电化学充氢试验、静态拉伸试验、断裂试验及微观组织分析表征等方式,探讨了氢含量对2.25Cr-1Mo钢氢脆敏感性和断裂韧性的影响规律与作用机理,同时建立了氢含量与断裂韧性的定量关系,确定了氢致材料发生塑性损失时的临界氢浓度。结果表明,随着氢含量的增加,试验钢的断面收缩率和断裂韧性显著降低,氢脆敏感指数增大,断口形貌发生了明显的韧脆转变,认为HEDE和HELP机制的共同作用是使2.25Cr-1Mo钢断裂韧性降低的主要原因。
Aiming at 2.25Cr-1Mo steel’s proneness to hydrogen embrittleness,the influence law and mechanism of hydrogen content on both hydrogen embrittleness sensitivity and fracture toughness of 2.25Cr-1Mo steel were discussed by electrochemical hydrogen filling test,static tensile test,fracture test and microstructure analysis and characterization.Meanwhile,the quantitative relationship between hydrogen content and fracture toughness was established,and the critical hydrogen concentration for plastic loss caused by hydrogen was determined.The results show that,with the increase of hydrogen content,the section shrinkage and fracture toughness of the test steel decrease significantly,the hydrogen embrittleness sensitivity index increases and the fracture morphology has an obvious tough-brittle transition.It is believed that the joint effect of HEDE and HELP mechanism become the main reason of fracture toughness decrease of the 2.25Cr-1Mo steel.
作者
罗金奇
赵建平
戴韬
杨真涵
吴怨
LUO Jin-qi;ZHAO Jian-ping;DAI Tao;YANG Zhen-han;WU Yuan(School of mechanical and power engineering,Nanjing Tech University)
出处
《化工机械》
2025年第4期560-567,共8页
Chemical Engineering & Machinery
基金
国家重点研发计划项目(批准号:2021YFC3001805)资助的课题。
关键词
2.25CR-1MO钢
氢含量
氢脆敏感性
断裂韧性
断口形貌
2.25Cr-1Mo steel
hydrogen content
hydrogen embrittlement sensitivity
fracture toughness
fracture morphology
