The influence of hydrogen on tensile properties of V-base alloys developed in China

Several V–Cr–Ti–Al–Si alloys were studied with respect to their mechanical performances after exposure to hydrogen environments. The alloys were developed in China by using a melting process in a magnetic floating furnace. Most of the alloys had a high oxygen concentration from 700 to 1100 wppm since the forging and hot rolling were performed in air at elevated temperature. The results showed a synergistic effect of oxygen and hydrogen. The ductility loss correlated largely with the hydrogen concentration up to 113 wppm. Both V4Ti and V4TiSi showed a relatively higher resistance to hydrogen embrittlement in comparison with other alloys such as V4Cr4Ti and V4Ti3Al.