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

作　　者：ZHANG Chao-lei LIU Ya-zheng JIANG Chao XIAO Jin fu 

机构地区：[1]School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

出　　处：《Journal of Iron and Steel Research International》2011年第6期49-53,共5页

基　　金：Item Sponsored by CITIC-CBMM Niobium Steel Research and Development Projects of China(2007RMJS-D031)

摘　　要：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 （8SRT）, 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.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 （8SRT）, 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 

分 类 号：TG156.34[金属学及工艺—热处理] TG142.41[金属学及工艺—金属学]