摘要
采用宏观检查、光学显微镜和扫描电镜等试验方法对16MnR钢LPG球罐在湿硫化氢环境下发生的氢鼓泡进行了取样分析,结果表明,氢鼓泡的产生与钢中沿带状珠光体分布的长条型MnS夹杂物密切相关。采用有限元软件ABAQUS,开发了氢扩散的有限元计算程序和多裂纹扩展技术,对氢向MnS夹杂扩散聚集引起氢鼓泡的行为进行有限元模拟,得到了扩散氢浓度随时间的分布以及氢鼓泡形貌。MnS/基体界面处应力集中,在湿H2S环境中,氢向界面扩散聚集,产生巨大氢压,使材料发生塑性变形,产生氢鼓泡。带状MnS夹杂物的数量越多、夹杂物越长、氢浓度越高,材料产生氢鼓泡敏感性越大。
Hydrogen blister（HB） in a liquefied petroleum gas spherical tank made of 16MnR steel under wet H2S environment was observed by using optical microscope （OM） and scanning electron microscope （SEM）. The results show that the HB is intimately correlated with the inclusion of strip MnS along with pearlite band in steel. A calculating method on hydrogen diffusion and multiple crack propagation technique was developed based on finite element program - ABAQUS. Using this method, the HB induced by MnS inclusion was numericaUy simulated, and the hydrogen concentration versus time and Hb morphology were obtained. Due to the stress concentration and hydrogen atoms to be trapped around the interface between MnS inclusion and base metal, hydrogen atoms accumulated to the interface and created a high hydrogen pressure, which causes great plastic deformation and hydrogen blister. With the hydrogen content increasing, the larger the amount and the longer the MnS, the greater the HB susceptibility is.
出处
《压力容器》
北大核心
2007年第2期9-14,共6页
Pressure Vessel Technology
基金
江苏省"六大人才高峰"项目(06-D-035)
国家留学回国人员科技活动择优资助项目(200209)
