湿H_2S环境下16MnR钢氢鼓泡的有限元模拟

Finite element simulation of hydrogen blistering of steel 16MnR serving in wet H_2S environment

针对16MnR钢中MnS夹杂在湿硫化氢环境下引起环境开裂事故的无法预测性问题,采用有限元软件ABAQUS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,得到了氢质量摩尔浓度随时间的分布以及氢鼓泡形貌。预测了产生鼓泡的临界质量摩尔浓度、压力以及产生断裂失效的时间。结果表面,在湿硫化氢环境中,氢向MnS/基体界面处扩散聚集,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、氢质量摩尔浓度越高,材料产生氢鼓泡的敏感性就越大。研究结果可为服役在氢环境中的装置预测性维修提供参考。

With respect to the unpredictability problem of the steel cracking induced by the MnS inclusion under the wet H2S environment, the by hydrogen blistering（HB） caused by the hydrogen diffusion into and accumulation in side the MnS inclusion in the steel 16 MnR was numerically simulated using the finite element program ABAQUS. The hydrogen concentration histories and the HB morphology were obtained. The critical hydrogen concentration and pressure as well as the fracture failure time by the HB were predicted. The results show that the diffusion of the hydrogen into and its accumulation inside the interface between the MnS and the substrate in the wet H2S environment create a high hydrogen pressure, which causes the plastic deformation and crack propagation in the material, results in the HB. The more the MnS inclusion, the longer the inclusion shape, the higher the hydrogen concentration, the greater the HB susceptivity is. The simulated results provide a reference for the predictive maintenance of the steel equipments serving in the hydrogen environment.