Reaction mechanisms between molten CaF<sub>2</sub>-based slags and molten 9CrMoCoB steel

Lei-zhen Peng; Zhou-hua Jiang; Xin Geng

doi:10.1007/s12613-020-1976-5

Volume 27 Issue 5

May 2020

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Lei-zhen Peng, Zhou-hua Jiang, and Xin Geng, Reaction mechanisms between molten CaF₂-based slags and molten 9CrMoCoB steel, Int. J. Miner. Metall. Mater., 27(2020), No. 5, pp. 611-619. https://doi.org/10.1007/s12613-020-1976-5

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Lei-zhen Peng, Zhou-hua Jiang, and Xin Geng, Reaction mechanisms between molten CaF2-based slags and molten 9CrMoCoB steel, Int. J. Miner. Metall. Mater., 27(2020), No. 5, pp. 611-619. https://doi.org/10.1007/s12613-020-1976-5

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Research Article

Reaction mechanisms between molten CaF₂-based slags and molten 9CrMoCoB steel

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Corresponding author:
Zhou-hua Jiang E-mail: jiangzh63@163.com
Received: 25 September 2019; Revised: 26 December 2019; Accepted: 27 December 2019; Available online: 8 January 2020

Abstract

Abstract

Investigating the reaction mechanism between slag and 9CrMoCoB steel is important to develop the proper slag and produce qualified ingots in the electroslag remelting (ESR) process. Equilibrium reaction experiments between molten 9CrMoCoB steel and the slags of 55wt%CaF₂–20wt%CaO–3wt%MgO–22wt%Al₂O₃–xwt%B₂O₃ (x = 0.0, 0.5, 1.0, 1.5, 2.0, 3.0) were conducted. The reaction mechanisms between molten 9CrMoCoB steel and the slags with different B₂O₃ contents were deduced based on the composition of the steel and slag samples at different reaction times. Results show that B content in the steel can be controlled within the target range when the B₂O₃ content is 0.5wt% and the FeO content ranges from 0.18wt% to 0.22wt% in the slag. When the B₂O₃ content is ≥1wt%, the reaction between Si and B₂O₃ leads to the increase of the B content of steel. The additions of SiO₂ and B₂O₃ to the slag should accord to the mass ratio of [B]/[Si] in the electrode, and SiO₂ addition inhibits the reaction between Si and Al₂O₃.
- 9CrMoCoB;
- electroslag remelting;
- B₂O₃;
- thermodynamic calculation;
- reaction mechanism

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[1]	Y.P. Yang, L.G. Wang, C.Q. Dong, G. Xu, T. Morosuk, and G. Tsatsaronis, Comprehensive exergy-based evaluation and parametric study of a coal-fired ultra-supercritical power plant, Appl. Energy, 112(2013), p. 1087. doi: 10.1016/j.apenergy.2012.12.063
[2]	J.P. Ciferno, T.E. Fout, A.P. Jones, and J.T. Murphy, Capturing carbon from existing coal-fired power plants, Chem. Eng. Prog., 105(2009), No. 4, p. 33.
[3]	Y.P. Zeng, J.D. Jia, W.H. Cai, S.Q. Dong, and Z.C. Wang, Effect of long-term service on the precipitates in P92 steel, Int. J. Miner. Metall. Mater., 25(2018), No. 8, p. 913. doi: 10.1007/s12613-018-1640-5
[4]	F. Abe, T. Horiuchi, M. Taneike, and K. Sawada, Stabilization of martensitic microstructure in advanced 9Cr steel during creep at high temperature, Mater. Sci. Eng. A, 378(2004), No. 1-2, p. 299. doi: 10.1016/j.msea.2003.11.073
[5]	P.J. Maziasz, Developing an austenitic stainless steel for improved performance in advanced fossil power facilities, JOM, 41(1989), No. 7, p. 14. doi: 10.1007/BF03220265
[6]	N. Blaes, B. Donth, and D. Bokelmann, High chromium steel forgings for steam turbines at elevated temperatures, Energy Mater., 2(2007), No. 4, p. 207. doi: 10.1179/174892408X382879
[7]	H. Chalmers and J. Gibbins, Initial evaluation of the impact of post-combustion capture of carbon dioxide on supercritical pulverised coal power plant part load performance, Fuel, 86(2007), No. 14, p. 2109. doi: 10.1016/j.fuel.2007.01.028
[8]	R. Viswanathan and W. Bakker, Materials for ultra-supercritical coal power plants—Turbine materials: Part II, J. Mater. Eng. Perform., 10(2001), No. 1, p. 96. doi: 10.1361/105994901770345402
[9]	V. Weber, A. Jardy, B. Dussoubs, D. Ablitzer, S. Rybéron, V. Schmitt, S. Hans, and H. Poisson, A comprehensive model of the electroslag remelting process: description and validation, Metall. Mater. Trans. B, 40(2009), No. 3, p. 271. doi: 10.1007/s11663-008-9208-9
[10]	Y.W. Dong, Z.H. Jiang, H. Liu, R. Chen, and Z.W. Song, Simulation of multi-electrode ESR process for manufacturing large ingot, ISIJ Int., 52(2012), No. 12, p. 2226. doi: 10.2355/isijinternational.52.2226
[11]	S.S. Kasana and O.P. Pandey, Effect of electroslag remelting and homogenization on hydrogen flaking in AMS-4340 ultra-high-strength steels, Int. J. Miner. Metall. Mater., 26(2019), No. 5, p. 611. doi: 10.1007/s12613-019-1769-x
[12]	E. Plöckinger, Electroslag remelting—A modern tool in metallurgy, [in] P. Beeley, ed., The Hatfield Memorial Lectures, vol. 3, Woodhead Publishing Limited, Cambridge, 2005, p. 45.
[13]	J.A. Van Den Avyle, J.A. Brooks, and A.C. Powell, Reducing defects in remelting processes for high-performance alloys, JOM, 50(1998), No. 3, p. 22. doi: 10.1007/s11837-998-0374-7
[14]	S.J. Li, G.G. Cheng, Z.Q. Miao, L. Chen, and X.Y. Jiang, Effect of slag on oxide inclusions in carburized bearing steel during industrial electroslag remelting, Int. J. Miner. Metall. Mater., 26(2019), No. 3, p. 291. doi: 10.1007/s12613-019-1737-5
[15]	V. Knežević, J. Balun, G. Sauthoff, G. Inden, and A. Schneider, Design of martensitic/ferritic heat-resistant steels for application at 650°C with supporting thermodynamic modelling, Mater. Sci. Eng. A, 477(2008), No. 1-2, p. 334. doi: 10.1016/j.msea.2007.05.047
[16]	F. Masuyama, History of power plants and progress in heat resistant steels, ISIJ Int., 41(2001), No. 6, p. 612. doi: 10.2355/isijinternational.41.612
[17]	T. Ishitsuka, Y. Inoue, and H. Ogawa, Effect of silicon on the steam oxidation resistance of a 9% Cr heat resistant steel, Oxid. Met., 61(2004), No. 1-2, p. 125.
[18]	A. Mitchell, F. Reyes-Carmona, and E. Samuelsson, The deoxidation of low-alloy steel ingots during ESR, Trans. Iron Steel Inst. Jpn., 24(1984), No. 7, p. 547. doi: 10.2355/isijinternational1966.24.547
[19]	F. Reyes-Carmona and A. Mitchell, Deoxidation of ESR slags, ISIJ Int., 32(1992), No. 4, p. 529. doi: 10.2355/isijinternational.32.529
[20]	G. Pateisky, H. Biele, and H.J. Fleischer, The reactions of titanium and silicon with Al₂O₃–CaO–CaF₂ slags in the ESR process, J. Vac. Sci. Technol., 9(1972), No. 6, p. 1318. doi: 10.1116/1.1317029
[21]	S.F. Medina and A. Cores, Thermodynamic aspects in the manufacturing of micro-alloyed steels by the electroslag remelting process, ISIJ Int., 33(1993), No. 12, p. 1244. doi: 10.2355/isijinternational.33.1244
[22]	J. Fedko and M. Krucinski, Thermodynamic analysis of boron concentration changes in steel during electroslag remelting, Ironmaking Steelmaking, 16(1989), No. 2, p. 116.
[23]	D.S. Kim, G.J. Lee, M.B. Lee, J.I. Hur, and J.W. Lee, Manufacturing of 9CrMoCoB steel of large ingot with homogeneity by ESR process, IOP Conf. Ser.: Mater. Sci. Eng., 143(2016), art. No. 012002.
[24]	V.A. Grigorân, L.N. Belânčikov, and A.Â. Stomahin, Theoretical Principles of Electric Steelmaking, Mir Publishers, Milpitas, 1983, p. 154.
[25]	Y.J. Liang, Y.C. Che, and X.X. Liu, Inorganic Thermodynamics Data Book, Northeast University Press, Shenyang, 1993, p. 216.
[26]	X.H. Huang, Principles of Iron and Steel Metallurgy, Metallurgical Industry Press, Beijing, 1990, p. 309.