文献类型：期刊文献

英文题名：The Role of Cu Addition in Microstructural Characteristics and Mechanical Properties in Submerged Arc Welded Joint of Low Carbon Low Alloy Steel

作者：Xi, Xiaohui[1];Feng, Yang[2];Yang, Guoli[3];Zhang, Hejia[4];Wang, Jinliang[1]

机构：[1]Guangdong Ocean Univ, Sch Mech & Power Engn, Zhanjiang 524088, Peoples R China;[2]Northeastern Univ, State Key Lab Rolling & Automation, Shenyang 110819, Peoples R China;[3]Hebei Univ Architecture, Zhang Jiakou 075000, Peoples R China;[4]Chengde Coll Appl Technol, Chengde, Peoples R China

年份：2022

卷号：63

期号：11

起止页码：1523

外文期刊名：MATERIALS TRANSACTIONS

收录：SCI-EXPANDED(收录号：WOS:000900933100002)、、EI(收录号：20224713136294)、Scopus(收录号：2-s2.0-85141899356)、WOS

基金：Acknowledgements This work is supported by the Science and Technology Projects of Zhanjiang with the Contract No. 2021E05003 and 211019116630767.

语种：英文

外文关键词：low carbon low alloy steel; submerged arc welding; Cu -rich precipitate; retained austenite; mechanical property

外文摘要：A good strength-toughness combination is difficult to be obtained in welded joint of low carbon low alloy steel. In this work, a new idea was proposed to improve the strength and toughness of welded joint by strengthening effect of Cu precipitation and toughening effect of retained austenite. The results show that a multiphase microstructure consisting of ferrite, martensite-austenite island, retained austenite as well as precipitates was obtained in welded metal of Cu-free and Cu-containing steel, while the retained austenite and precipitates were found in fine grained heat affected zone (FGHAZ) and coarse grained HAZ (CGHAZ). It is noted that Cu addition changed the ferrite from polygonal-like to acicular-like, increased amount of retained austenite and promoted the Cu-rich precipitates. Accordingly, a better combination of strength, ductility and toughness was achieved in welded joint of Cu-containing steel. Cu-rich precipitates and strain-induced martensitic transformation of retained austenite maintained high strength in welded joint. Meanwhile, high toughness was ascribed to strain-induced martensitic transformation of retained austenite, acicular ferrite and high angle grain boundary. [doi:10.2320/matertrans.MT-M2022095]