Effects of boron content on the microstructure and impact toughness of 12cr1movr low-alloy heat-resistant steel weld metals

doi:10.3390/ma14040926

	Effects of boron content on the microstructure and impact toughness of 12cr1movr low-alloy heat-resistant steel weld metals
	Dou, Guishan 1,2; Cao, Rui 1,2; Cai, Changliang 1,2; Han, Cheng 1,2; Guo, Xili 3; Jiang, Yong 3; Chen, Jianhong 1,2
刊名	Materials
	2021-02-01
卷号	14 期号:4 页码:1-15
关键词	Boron Carbides Chromium steel Ductile fracture Fracture testing Fracture toughness Grain size and shape Metals Microstructure Welds Boron content Fracture surfaces Heat-resistant steel Minor microstructure Prior austenite grain size Shelf zones Testing temperature Weld metal
DOI	10.3390/ma14040926
英文摘要	The impact toughness of low-Cr heat-resistant steel weld metal is an important problem to broaden the application of low-Cr heat-resistant steel. In this study, the microstructure and impact toughness of 12Cr1MoVR low-alloy heat-resistant steel weld metals with various boron contents (B1 = 0.0028%, B2 = 0.0054%, and B3 = 0.0079%) were investigated. The microstructures of all weld metals were composed of block ferrite, carbides, and inclusions. Results indicated that with increased B content, prior austenite grain sizes decreased, and minor microstructure changes could be found. With the increase in B content from 0.0028% to 0.0054% to 0.0079%, the ductile–brittle transition temperature of the weld metals decreased from 30 to 0 to −14 °C, the toughness of weld metal increased, and the hardness slightly decreased, all of which are directly related to the refine-ment of prior austenite grain size because of the addition of B content. However, on the top-shelf zone, such as at the testing temperature of 80 °C, ductile fracture dominates the fracture surface; with the increase in B content, the size and density of inclusions increased gradually, which led to the decrease of the impact toughness at 80 °C when the B content was 0.0079%. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
语种	英语
出版者	MDPI AG
WOS记录号	WOS:000624119700001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/147721]
专题	材料科学与工程学院
作者单位	1.Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu; 730050, China; 2.State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metal, Lanzhou University of Technology, Lanzhou; 730050, China; 3.Atlantic China Welding Consumables, Inc, Zigong; 643000, China
推荐引用方式 GB/T 7714	Dou, Guishan,Cao, Rui,Cai, Changliang,et al. Effects of boron content on the microstructure and impact toughness of 12cr1movr low-alloy heat-resistant steel weld metals[J]. Materials,2021,14(4):1-15.
APA	Dou, Guishan.,Cao, Rui.,Cai, Changliang.,Han, Cheng.,Guo, Xili.,...&Chen, Jianhong.(2021).Effects of boron content on the microstructure and impact toughness of 12cr1movr low-alloy heat-resistant steel weld metals.Materials,14(4),1-15.
MLA	Dou, Guishan,et al."Effects of boron content on the microstructure and impact toughness of 12cr1movr low-alloy heat-resistant steel weld metals".Materials 14.4(2021):1-15.