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, Rui 1,2; Han, Cheng 1,2; Guo, Xili 3; Jiang, Yong 3; Liao, Fen 3; Yang, Fei 3; Dou, Guishan 1,2; Yan, Yingjie 1,2; Chen, Jianhong 1,2
刊名	Materials Science and Engineering A
	2022-01-26
卷号	833
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
ISSN号	0921-5093
DOI	10.1016/j.msea.2021.142560
英文摘要	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
语种	英语
出版者	Elsevier Ltd
内容类型	期刊论文
源URL	[http://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
作者单位	1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou; Gansu; 730050, China; 2.Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou; Gansu; 730050, China; 3.Atlantic China Welding Consumables, Inc, Zigong; 643000, China
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).