文献类型：期刊文献

英文题名：Research on the mechanism of Cu addition on the grain boundary characteristics and toughness in CGHAZ of low carbon low alloy steel

作者：Xi, Xiaohui[1];Wu, Tong[1];Wang, Shuai[2];Wang, Jinliang[1];Wang, Gui[1];Chen, Liqing[2]

机构：[1]Guangdong Ocean Univ, Sch Mech Engn, Zhanjiang 524088, Peoples R China;[2]Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China

年份：2023

卷号：23

起止页码：577

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

收录：SCI-EXPANDED(收录号：WOS:000965563700001)、、EI(收录号：20230913632143)、Scopus(收录号：2-s2.0-85148547483)、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 211019116630767) and the program for scientific research start-up funds of Guang- dong Ocean University.

语种：英文

外文关键词：Low carbon low alloy steel; Cu; Toughness; Grain boundary; Variant selection

外文摘要：In this study, the coarse grained heat affected zone (CGHAZ) of Cu-containing/free steels was simulated at various heat inputs by thermal simulator. A comparative study was conducted to reveal the role of Cu addition and heat input in toughness variation by microstructural observation and crystallographic analysis. The results showed that the toughness exhibited a plateau-like variation with heat input increasing, which was mainly determined by the distribution of high angle grain boundary (HAGB). Also, a considerably higher toughness was achieved in Cu-containing steel irrespective of heat input. This attributed to the grain boundary distribution and variation selection. Cu addition weakened the variation selection and promoted the formation of more Bain groups, which helped to increase the fraction of HAGB and improve the impact toughness. In addition, Cu addition resulted in a higher fraction of boundary length in V1/V2, V1/V3, V1/V5 variant pair, which was beneficial to accommodate the transformation strain and release the residual stress, leading to a higher toughness in Cu-containing steels.(c) 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).