摘要
以一种吉帕级马氏体海工钢为研究对象,研究该材料氢脆敏感性与充氢时间、预制缺口之间的关系。充氢电流密度设置为10 mA/cm^(2),充氢时间分别设定为2、6、24 h。试样平行段预制V形以及圆弧形缺口。此外,对试样断口形貌进行扫描电子显微镜分析。试验结果表明,充氢时间对材料氢脆敏感性有显著影响,充氢时间越长,材料塑性越差,氢脆敏感性指数越高。充氢时间大于6 h后,材料氢脆敏感性指数的增长速度变慢,趋于定值;圆弧形缺口试样氢脆敏感性指数及断口形貌与无缺口试样相仿,可用来研究材料氢脆敏感性。而V形缺口试样由于较大的应力集中,在6 h充氢后塑性损失极大,断口形貌和无缺口试样差距较大,不适用于材料氢脆敏感性研究。
The relationship between the hydrogen embrittlement sensitivity of a GPa-level marine steel and the hydrogen charging time,the pre-fabricated notches was studied.The hydrogen charging current density was set to 10mA/cm^(2).The hydrogen charging time was set to 2,6 and 24h,respectively.V-shaped and arc-shaped notches were pre-fabricated on the parallel sections of the tensile specimen.In addition,scanning electron microscopy analysis was performed on the fracture morphology.Experimental results show that the hydrogen charging time has a significant impact on the hydrogen embrittlement susceptibility of the studied steel.The longer the hydrogen charging time,the worse the plasticity of the material and the higher the hydrogen embrittlement susceptibility index.Once the hydrogen charging time is longer than 6h,the increasing rate of the hydrogen embrittlement sensitivity index slows down and tends to a constant value;the hydrogen embrittlement sensitivity index and fracture surface morphology of the arc-shaped notched specimen are similar to those of the unnotched specimen,and can be used for hydrogen embrittlement susceptibility analysis.However,due to the large stress concentration,the V-notched specimen has a great plasticity loss after 6 h of hydrogen charging,and the fracture morphology is significantly different from that of the unnotched specimen.V-notch is not suitable for hydrogen embrittlement susceptibility analysis.
作者
李天怡
刘文月
孙美慧
安涛
臧岩
李江文
LI Tianyi;LIU Wenyue;SUN Meihui;AN Tao;ZANG Yan;LI Jiangwen(State Key Laboratory of Metal Materials for Marine Equipment and Application,Anshan 114000,Liaoning,China;Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102211,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2024年第2期226-236,共11页
Journal of Iron and Steel Research
关键词
吉帕级海工钢
氢脆敏感性
预制缺口
断口分析
GPa-level marine steel
hydrogen embrittlement susceptibility
pre-fabricated notch
fracture surface analysis
