文献类型：期刊文献

英文题名：The role of copper in microstructure and toughness of intercritically reheated coarse grained heat affected zone in a high strength low alloy steel

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

机构：[1]Guangdong Ocean Univ, Sch Mech & Power Engn, Zhanjiang 524000, Peoples R China;[2]Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China

年份：2021

卷号：181

外文期刊名：MATERIALS CHARACTERIZATION

收录：SCI-EXPANDED(收录号：WOS:000711441700001)、、EI(收录号：20214111017894)、Scopus(收录号：2-s2.0-85116886775)、WOS

语种：英文

外文关键词：High strength low alloy steel; Copper; Reverted structure; Cu-rich precipitate; Toughness; Intercritically reheated coarse grained heat affected zone

外文摘要：This paper presents an investigation on the role of Cu addition in microstructure and toughness of intercritically reheated coarse grained heat affected zone (ICCGHAZ), aiming at elucidating the influencing mechanism of Cu addition on toughness in terms of reverted transformation, alloying element diffusion and variant selection. The element of Cu has a significant effect on reverted structure and Cu-rich precipitates by influencing the diffusion of alloying elements and variant selection. On the one hand, the addition of Cu changed the diffusion kinetics of Ni and Mn, decreasing the segregation of elements at grain boundaries. Accordingly, the reverted structure at grain boundary with an adverse effect on toughness was reduced. Moreover, Cu addition changed the feature of CP group during variant selection, and thus increased the high angle grain boundary density. On the other hand, Cu-rich precipitates were increased after Cu addition, which was easier to originate crack. But, the ductile character of the reverted structure would overwhelm the harmful effect of Cu-rich precipitates on the toughness. As a result, a higher low temperature toughness with impact energy of 72.8 J at -40 degrees C was achieved in 1.5Cu steel than that in 0Cu steel (36.3 J).