Oxidation behavior of boron in 9CrMoCoB steel by CaF2-CaO-Al2O3-SiO2-B2O3 electroslag remelting (ESR) type slag
- Title
- Oxidation behavior of boron in 9CrMoCoB steel by CaF2-CaO-Al2O3-SiO2-B2O3 electroslag remelting (ESR) type slag
- Author
- 박주현
- Keywords
- 9CrMoCoB steel; Electroslag remelting (ESR); Ion-molecule coexistence theory; (IMCT); Oxidation; Boron; Silicon
- Issue Date
- 2022-03
- Publisher
- ELSEVIER
- Citation
- JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, v. 17, Page. 574-585
- Abstract
- The laboratory-scale experiments between the CaF2-CaO-Al2O3-SiO2-B2O3 slag and 9CrMoCoB steel were carried out in alumina and magnesia crucibles at 1823 K to investigate the oxidation behavior of boron (B) during the electroslag remelting (ESR) process. The activities of SiO2 and B2O3 in the slag and the activities of Si and B in the molten steel were calculated by the ion and molecule coexistence theory (IMCT) and the Wagner formalism, respectively. The results showed that both SiO2 and B2O3 have a significant influence on the equilibrium B content. The calculated content of B was in good agreement with the experimental value when the SiO2 thorn B2O3 content in the slag is more than 3.3 wt%. The temperature had little influence on the equilibrium B content when the SiO2, B2O3 and CaO content were in the ranges of 3-5 wt%, 0-1 wt%, and 20-30 wt%, respectively. However, the Si is more prone to oxidation than is B as the temperature increases, indicating that more SiO2 should be added in the slag to reduce the oxidation of Si. From the 80 tonnes industrial tests, the distribution of B and Si content along with the radial direction of the remelted ingot was almost uniform, which is in line with the calculated B content (approx. 30 ppm) under conditions of the Si content in the liquid steel and the (%B2O3)/(%SiO2) ratio are 0.07% and 0.05, respectively, at 1973 K.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
- URI
- https://www.sciencedirect.com/science/article/pii/S2238785422000333?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/175913
- ISSN
- 2238-7854;2214-0697
- DOI
- 10.1016/j.jmrt.2022.01.033
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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