ABSTRACT

The role of vanadium content in hydrogen diffusion behaviour in X80 pipeline steel has been investigated. The results show that the hydrogen diffusion coefficient decreases from 1.54 × 10⁻⁶ cm² s⁻¹ in 1# steel with 0.03 wt-% vanadium to 9.97 × 10⁻⁷ cm² s⁻¹ in 3# steel with 0.14 wt-% vanadium due to the increase in irreversible and reversible traps. With the increase in vanadium content, more vanadium carbides precipitate in tested steels. The length (or number) of the low angle grain boundaries and special grain boundaries increase because of grain refinement, making the number of reversible traps increase. The dynamic condition of diffusible hydrogen in 3# tested steel with the largest number of hydrogen traps is the weakest. To weaken hydrogen-induced cracking dynamic condition, it is recommended to add 0.14 wt-% vanadium to X80 pipeline steel.

摘要

研究了钒含量在 X80 管线钢中氢扩散行为中的作用。结果表明，氢扩散系数从含0.03 wt-%钒的1#钢中的1.54 × 10 ^-6  cm ²  s ^{-1降低到9.97 × 10 -7} cm ²  s ^-1由于不可逆和可逆陷阱的增加，在含 0.14 wt-% 钒的 3# 钢中。随着钒含量的增加，更多的碳化钒在被测钢中析出。由于晶粒细化，小角度晶界和特殊晶界的长度（或数量）增加，使可逆陷阱的数量增加。氢阱数量最多的3#试验钢中扩散氢的动态条件最弱。为了减弱氢致开裂动态条件，建议在 X80 管线钢中添加 0.14 wt-% 的钒。