| Strengthening mechanism of steels treated by barium-bearing alloys | |
| Alternative Title | Strengthening mechanism of steels treated by barium-bearing alloys |
| Li Yang; Jiang Zhouhua; Liu Yang | |
| 2008 | |
| Source Publication | JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING
 |
| ISSN | 1005-8850 |
| Volume | 15Issue:3Pages:220-226 |
| Abstract | 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. |
| Other Abstract | 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. |
| Keyword | DEOXIDATION CALCIUM 304L stainless steel 70 steel barium-bearing alloys deoxidation desulfurization dephosphorization microstructure mechanical properties |
| Indexed By | CSCD |
| Language | 英语 |
| CSCD ID | CSCD:3316399 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/147336 |
| Collection | 中国科学院金属研究所 |
| Affiliation | 中国科学院金属研究所 |
| Recommended Citation 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. |
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