Based on the chemical composition of traditional hot-stamped steel (e.g., 22MnB5 and 30MnB5), Nb and V microalloying elements are added into 30MnB5 steel to meet the requirements of ultra-high strength, excellent ductility and potent resistance to hydrogen embrittlement (HE) at the same time. The influence of hot-stamped steel on HE was studied by conducting a hydrogen permeation method and pre-charged hydrogen slow strain rate test. Meanwhile, the experimental steel microstructures and corresponding fracture surfaces are observed and analyzed to characterize HE behavior. The results show that a finer microstructure, a lower apparent diffusion coefficient of hydrogen and a smaller percentage of strength and plasticity reduction are obtained due to the addition of the vanadium element into hot-stamped steel. Compared to the V free experimental steel, the steel with 0.14 wt.% V has a large number of dispersive precipitates and more grain boundary areas, which makes hydrogen atoms dispersedly distribute.

根据传统热冲压钢（例如22MnB5和30MnB5）的化学成分，向30MnB5钢中添加了Nb和V微合金元素，以满足超高强度，出色的延展性和对氢脆（HE）的强抵抗力的要求同时。通过氢渗透法和预充氢慢应变速率试验研究了热压钢对HE的影响。同时，观察并分析了实验钢的显微组织和相应的断裂表面，以表征HE行为。结果表明，由于在热冲压钢中添加了钒元素，获得了更精细的组织，更低的氢表观扩散系数以及更小的百分比的强度和塑性降低。