18Ni马氏体时效钢塑变氢行为的离子探针研究

SIMS Study on Hydrogen Release Behaviour of 18Ni Maraging Steel during Plastic Deformation

本文利用LT-IA型离子探针研究了工程上大量应用的固溶和时效态18Ni马氏体时效钢塑性形变过程中氢的行为。结果表明,氢释放速率随应力的增大而增加,且随应变量的增加呈指数关系下降,即在屈服点附近达到最大,然后随着应变的进一步增加而减小。塑变后钢中的氢扩散系数为10^(-13)cm^2/sec,比未形变钢中的氢渗透时测定的氢扩散系数小3～4个数量级,高真空下固溶和时效态样品的氢逸出速率分别为15%/hr和10%/hr。文中还讨论了析出相、不动位错和可动位错在塑变过程中与氢的相互作用。

In this paper, hydrogen behaviour in high dislocation density material during plastic deformation was studied by means of SIMS. Experimental results show that hydrogen release rate increases with the increases of stress in elastic deformation stage ; the hydrogen release rate increase dramatically at the very beginning of plastic deformation, and reaches the maximum in the vicinity of yield point, then it decreases with the further increases of strain. The magnitude of hydrogen diffusivity obtained by using Fick's law is 10^(-13)cm^2/s.