Effect of nanosized NbC precipitates on hydrogen-induced cracking of high-strength low-alloy steel  

作　　者：En-dian Fan Shi-qi Zhang Dong-han Xie Qi-yue Zhao Xiao-gang Li Yun-hua Huang 

机构地区：[1]Institution for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China [2]Key Laboratory of Advanced Materials(MOE),School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [3]Ningbo Institute of Material Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2021年第2期249-256,共8页矿物冶金与材料学报（英文版）

基　　金：This work was financially supported by the National Key Research and Development Program of China(No.2016YFB0300604);the National Natural Science Foundation of China(Nos.51971033 and 51801011);the National Basic Research Program of China(No.2014CB643300);the National Materials Corrosion and Protection Data Center.

摘　　要：We investigated the effect of nanosized NbC precipitates on hydrogen-induced cracking(HIC)of high-strength low-alloy steel by conducting slow-strain-rate tensile tests(SSRT)and performing continuous hydrogen charging and fracture analysis.The results reveal that the HIC resistance of Nb-bearing steel is obviously superior to that of Nb-free steel,with the fractured Nb-bearing steel in the SSRT exhibiting a smaller ratio of elongation reduction(Iδ).However,as the hydrogen traps induced by NbC precipitates approach hydrogen saturation,the effect of the precipitates on the HIC resistance attenuate.We speculate that the highly dispersed nanosized NbC precipitates act as irreversible hydrogen traps that hinder the accumulation of hydrogen at potential crack nucleation sites.In addition,much like Nb-free steel,the Nb-bearing steel exhibits both H-solution strengthening and the resistance to HIC.

关 键 词：nanosized NbC precipitates high-strength low-alloy steel hydrogen-induced cracking slow-strain-rate tensile hydrogen charging 

分 类 号：TG142.33[一般工业技术—材料科学与工程]