On the Mechanism of Steel Homogenization via Rare Earth Addition: Experimental Characterization and Numerical Simulation

doi:10.1007/s11663-022-02496-4

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	On the Mechanism of Steel Homogenization via Rare Earth Addition: Experimental Characterization and Numerical Simulation
	Cao, Yanfei 1; Miao, Yangyang 1,2; Li, Dianzhong 1; Chen, Yun 1; Fu, Paixian 1; Liu, Hongwei 1; Kang, Xiuhong 1; Liu, Hanghang 1; Sun, Chen 1
刊名	METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
	2022-03-26
页码	17
ISSN号	1073-5615
DOI	10.1007/s11663-022-02496-4
通讯作者	Li, Dianzhong(dzli@imr.ac.cn)
英文摘要	Macrosegregation is one of the most typical defects during solidification which greatly limits the mechanical properties of the key steel components. Oxygen and its inclusion have been considered to cause the compositional heterogeneity in solidifying steel besides the thermo-solutal convection. However, it is still not clear how to robustly reduce the oxygen and inclusion and consequently macrosegregation in widely used steels. Here, we reported the mechanism to homogenize the steel via Rare Earth (RE) addition. A series of experimental characterizations of 3-ton bearing steel ingots demonstrated that RE is able to decrease the oxygen content and inclusions to a lower level than the conventional Al-deoxidation process. The common oxide and sulfide can be modified into spherical or ellipsoidal RE2O2S with a dispersed distribution. The multi-component/multi-phase macrosegregation simulations show that the larger size and population of RE2O2S are required to trigger channel segregation in RE steel due to its higher density compared to the alumina-based inclusions. The theoretical calculation reveals that the critical oxygen content in RE steel to eliminate channel segregation is dramatically increased into 20 ppm, which indicates a lower risk of destabilization of mushy zone and initiation of channel segregation in RE steel. In addition, the global macrosegregation severity is reduced in RE steel. Such conclusion is fully validated in larger 9.5-ton and 100-ton steel ingots. In terms of the interaction between inclusion motion, fluid flow, and solidification, this study elucidates the mechanism of RE to reduce macrosegregation for the first time, and highlights an economic, common, and controllable method to fabricate homogenized steel by RE addition.
资助项目	National Science and Technology Major Project[2017-VII-0008-0101] ; National Natural Science Foundation[52031013] ; National Natural Science Foundation[U1708252] ; National Key Research and Development Program[2018YFA0702900] ; Project to Strengthen Industrial Development at the Grass-roots Level[TC190A4DA/35]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000773847800001
资助机构	National Science and Technology Major Project ; National Natural Science Foundation ; National Key Research and Development Program ; Project to Strengthen Industrial Development at the Grass-roots Level
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/173086]
专题	金属研究所_中国科学院金属研究所
通讯作者	Li, Dianzhong
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Cao, Yanfei,Miao, Yangyang,Li, Dianzhong,et al. On the Mechanism of Steel Homogenization via Rare Earth Addition: Experimental Characterization and Numerical Simulation[J]. METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,2022:17.
APA	Cao, Yanfei.,Miao, Yangyang.,Li, Dianzhong.,Chen, Yun.,Fu, Paixian.,...&Sun, Chen.(2022).On the Mechanism of Steel Homogenization via Rare Earth Addition: Experimental Characterization and Numerical Simulation.METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,17.
MLA	Cao, Yanfei,et al."On the Mechanism of Steel Homogenization via Rare Earth Addition: Experimental Characterization and Numerical Simulation".METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE (2022):17.