材料期刊网

Effects of Niobium and Vanadium on HydrogenInduced Delayed Fracture in High Strength Spring Steel

ZHANG Chaolei , LIU Yazheng , JIANG Chao , XIAO Jinfu

钢铁研究学报(英文版)

Influence of vanadium and/or niobium additions on delayed fracture behavior in high strength spring steel was studied by hydrogen permeation method and slow strain rate technique (SSRT), and its mechanism was analyzed. The results show that apparent diffusion coefficient of hydrogen in microalloyed spring steels NbVsteel and Nbsteel is lower than that in nonmicroalloyed steel 60Si2MnA. Percentage of strength reduction in SSRT in air after precharged hydrogen of the microalloyed steels is smaller than that of 60Si2MnA. Addition of the microalloys changes the fracture characteristics. Thence, vanadium and/or niobium additions are a very effective and economy means to improve the hydrogeninduced delayed fracture resistance of high strength spring steel.

关键词: spring steel , microalloy , hydrogeninduced delayed fracture , slow strain rate technique , hydrogen permeation