文献类型：期刊文献

英文题名：Enhancement of the resistance to hydrogen embrittlement by tailoring grain boundary characteristics in a low carbon high strength steel

作者：Xi, Xiaohui[1,2];Liu, Zhikun[1,2];Qin, Zhenbo[3];Wu, Tong[1,2];Wang, Jinliang[1,2];Xu, Ning[4];Chen, Liqing[4]

机构：[1]Guangdong Ocean Univ, Sch Mech Engn, Zhanjiang 524088, Peoples R China;[2]Zhanjiang Key Lab Corros & Protect Ocean Engn Equi, Zhanjiang 524088, Peoples R China;[3]Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China;[4]Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China

年份：2023

卷号：27

起止页码：7119

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：SCI-EXPANDED(收录号：WOS:001129107900001)、、EI(收录号：20234815131435)、Scopus(收录号：2-s2.0-85177749063)、WOS

基金：This work is supported by the National Natural Science Foundation of China (Grant No: 52101133) , Guangdong Basic and Applied Basic Research Foundation (Grant No: 2021A1515110581) , the Science and Technology Projects of Zhanjiang (Grant No: 2021E05003 and 2022A01031) and the program for scientific research start-up funds of Guangdong Ocean University (Grant No: 060302062306 and 060302062102).

语种：英文

外文关键词：Low carbon high strength steel; Hydrogen embrittlement; Grain boundary characteristics; Crack propagation

外文摘要：In this work, the feasibility of using "grain boundary engineering" to reduce the susceptibility to hydrogen embrittlement in a low carbon low alloy steel was examined. By adding Cu element, the fraction of random grain boundary (RGB) exhibited the highest value in the steel with 1%Cu, while the fraction of special grain boundary (SGB) showed a monotonical decline. The slow strain rate tensile (SSRT) test revealed that the elongation loss presented an increase with Cu addition increasing from 1 % to 3 %. This can be explained in terms of hydrogen diffusion, hydrogen trap and crack propagation. The steel with 1%Cu had a higher fraction of high angle grain boundary (HAGB), which contributed to a higher density of hydrogen traps and a lower hydrogen diffusion rate. Moreover, the steel with 1%Cu had the highest fraction of SGB ( n-ary sumation 3, n-ary sumation 5, n-ary sumation 7 and n-ary sumation >= 9), which was beneficial to the resistance to crack propagation. Under the combined effect of RGB and SGB, a higher resistance to hydrogen embrittlement was achieved in the steel with 1%Cu.