Strengthening mechanism of steels treated by barium-bearing alloys

IMR OpenIR

	Strengthening mechanism of steels treated by barium-bearing alloys
其他题名	Strengthening mechanism of steels treated by barium-bearing alloys
	Li Yang; Jiang Zhouhua; Liu Yang
	2008
发表期刊	JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING
ISSN	1005-8850
卷号	15 期号:3 页码:220-226
摘要	The deoxidation, desulfurization, dephosphorization, microstructure, and mechanical properties of steels treated by barium-bearing alloys were investigated in laboratory and by industrial tests. The results show that barium takes part in the deoxidation reaction at the beginning of the experiments, generating oxide and sulfide compound inclusions, which easily float up from the molten steel, leading to the rapid reduction of total oxygen content to a very low level. The desulfurization and dephosphorization capabilities of calcium-bearing alloys increase with the addition of barium. The results of OM and SEM observations and mechanical property tests show that the structure of the steel treated by barium-bearing alloys is refined remarkably, the lamellar thickness of pearlitic structure decreases, and the pearlitic morphology shows clustering distribution. Less barium exists in steel substrate and the enrichment of barium-bearing precipitated phase mostly occurs in grain boundary and phase boundary, which can prevent the movement of grain boundary and dislocation during the heat treatment and the deformation processes. Therefore, the strength and toughness of barium-treated steels are improved by the effect of grain-boundary strengthening and nail-prick dislocation. (C) 2008 University of Science and Technology Beijing. All rights reserved.
其他摘要	The deoxidation, desulfurization, dephosphorization, microstructure, and mechanical properties of steels treated by barium-bearing alloys were investigated in laboratory and by industrial tests. The results show that barium takes part in the deoxidation reaction at the beginning of the experiments, generating oxide and sulfide compound inclusions, which easily float up from the molten steel, leading to the rapid reduction of total oxygen content to a very low level. The desulfurization and dephosphorization capabilities of calcium-bearing alloys increase with the addition of barium. The results of OM and SEM observations and mechanical property tests show that the structure of the steel treated by barium-bearing alloys is refined remarkably, the iamellar thickness of pearlitic structure decreases, and the pearlitic morphology shows clustering distribution. Less barium exists in steel substrate and the enrichment of barium-bearing precipitated phase mostly occurs in grain boundary and phase boundary, which can prevent the movement of grain boundary and dislocation during the heat treatment and the deformation processes. Therefore, the strength and toughness of barium-treated steels are improved by the effect of grain-boundary strengthening and nail-prick dislocation.
关键词	DEOXIDATION CALCIUM 304L stainless steel 70 steel barium-bearing alloys deoxidation desulfurization dephosphorization microstructure mechanical properties
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:3316399
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/147336
专题	中国科学院金属研究所
作者单位	中国科学院金属研究所
推荐引用方式 GB/T 7714	Li Yang,Jiang Zhouhua,Liu Yang. Strengthening mechanism of steels treated by barium-bearing alloys[J]. JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING,2008,15(3):220-226.
APA	Li Yang,Jiang Zhouhua,&Liu Yang.(2008).Strengthening mechanism of steels treated by barium-bearing alloys.JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING,15(3),220-226.
MLA	Li Yang,et al."Strengthening mechanism of steels treated by barium-bearing alloys".JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING 15.3(2008):220-226.