Effects of boron on the microstructure and impact toughness of weathering steel weld metals and existing form of boron

doi:10.1016/j.msea.2021.142560

	Effects of boron on the microstructure and impact toughness of weathering steel weld metals and existing form of boron
	Cao, Rui1,2 ; Han, Cheng 1,2; Guo, Xili 3; Jiang, Yong 3; Liao, Fen 3; Yang, Fei 3; Dou, Guishan 1,2; Yan, Yingjie1,2 ; Chen, Jianhong1,2
	2022-01-26
发表期刊	Materials Science and Engineering A
ISSN	0921-5093
卷号	833
摘要	In this study, the effects of various boron contents on the microstructure, impact toughness, and fracture surface of the weathering steel weld metals were firstly investigated. Secondly, the existence form and distribution of the boron element were also studied. Results indicated with the increase of boron content, the microstructure gradually changes from block ferrite to granular bainite, the amount of boron-containing second phases obviously increases, and the low temperature impact toughness first increases and then decreases. The weld metal with 0.0042% boron content has the best low temperature impact toughness. Compared to the weld metals with boron free and boron content of 0.0087%, the ductile brittle transition temperature of the weld metal with boron content of 0.0042% is reduced by 29 °C and 25 °C respectively. Due to the transformation of microstructure and the increase of second phases, the microhardness presents an increasing trend. By means of Secondary Ion Mass Sectrometry (SIMS), the distribution and existing forms of boron are accurately characterized. It is found that boron is mainly concentrated on the original austenite grain boundary in the form of boron oxide, and a very small amount of boron exists in the form of boron carbide. Therefore, the appropriate amount of boron can significantly improve the low-temperature impact toughness of the weathering steel weld metal. The optimal boron content in this study is 0.0042%. Excessive or insufficient boron addition leads to the reduction of low-temperature impact toughness. © 2021
关键词	Bainite Boron carbide Grain boundaries Metals Microstructure Temperature Weathering Welds Boron content Existing forms Ion mass Low temperature impact toughness Second phase Secondary ion mass sectrometry Secondary ions Steel weld metal Weathering steel weld metal Weld metal
DOI	10.1016/j.msea.2021.142560
收录类别	EI ; SCIE
语种	英语
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000761818600001
出版者	Elsevier Ltd
EI入藏号	20220111423784
EI主题词	Fracture toughness
EI分类号	531.2 Metallography ; 538.2 Welding ; 641.1 Thermodynamics ; 804.2 Inorganic Compounds ; 812.1 Ceramics ; 951 Materials Science
来源库	WOS
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/159067
专题	材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院_特聘教授组
通讯作者	Cao, Rui
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China; 2.Lanzhou Univ Technol, Dept Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China; 3.Atlantic China Welding Consumables Inc, Zigong 643000, Peoples R China
第一作者单位	省部共建有色金属先进加工与再利用国家重点实验室; 兰州理工大学
通讯作者单位	省部共建有色金属先进加工与再利用国家重点实验室; 兰州理工大学
第一作者的第一单位	省部共建有色金属先进加工与再利用国家重点实验室
推荐引用方式 GB/T 7714	Cao, Rui,Han, Cheng,Guo, Xili,et al. Effects of boron on the microstructure and impact toughness of weathering steel weld metals and existing form of boron[J]. Materials Science and Engineering A,2022,833.
APA	Cao, Rui.,Han, Cheng.,Guo, Xili.,Jiang, Yong.,Liao, Fen.,...&Chen, Jianhong.(2022).Effects of boron on the microstructure and impact toughness of weathering steel weld metals and existing form of boron.Materials Science and Engineering A,833.
MLA	Cao, Rui,et al."Effects of boron on the microstructure and impact toughness of weathering steel weld metals and existing form of boron".Materials Science and Engineering A 833(2022).