Abstract
Large-size primary MC carbides can significantly reduce the performance of M2 high-speed steel. To better control the morphology and size of primary MC carbides, the effect of melting rate on microsegregation and primary MC carbides of M2 steel during electroslag remelting was investigated. When the melting rate is decreased from 2 kg·min−1 to 0.8 kg·min−1, the columnar dendrites are gradually coarsened, and the extent of segregation of Mo and V is alleviated, while the segregation of Cr becomes severe. At 2 kg·min−1, the number of primary MC carbides per unit area with the sizes in the range of 2 µm to 6 µm accounts for about 75% of all MC carbides, while the carbides are mainly concentrated on the size larger than 8 µm at 0.8 kg·min−1. Thermodynamic calculations based on the Clyne-Kurz (simplified to C-K) model shows that MC carbide can be precipitated in the final solidification stage and a smaller secondary dendrite arm spacing caused by higher melting rate (2 kg·min−1 in this experiment) facilitates the refinement of primary MC carbides.
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Boccalini M, Goldenstein H. Solidification of high speed steels. International Materials Reviews. 2001, 46(2): 92–115.
Wang H B, Hou L G, Ou P, et al. Enhanced microstructures and properties of spray-formed M3:2 high-speed steels by niobium addition and thermal-mechanical treatment. Journal of Materials Research, 2018, 34(6): 1043–1053.
Ding P D, Shi G Q, Zhou S Z. As-cast carbides in high-speed steels. Metallurgical & Materials Transactions A, 1993, 24A: 1265–1272.
Chaus A S, Sahul M. On origin of delta eutectoid carbide in M2 high-speed steel and its behaviour at high temperature. Materials Letters, 2019, 256: 126605.
Luo Y W, Guo H J, Sun X L, et al. Gleeble-simulated and semi-industrial studies on the microstructure evolution of Fe-Co-Cr-Mo-W-V-C alloy during hot deformation. Materials, 2018, 1: 326–322.
Pan F S, Wang W Q, Tang A T, et al. Phase transformation refinement of coarse primary carbides in M2 high speed steel. Progress in Natural Science: Materials International, 2011, 21: 180–186.
Guo G S. High speed steel and its heat treatment. Beijing: Industry Press, 1985: 97. (In Chinese)
Hwang K C, Lee S, Lee H C. Effects of alloying elements on microstructure and fracture properties of cast high speed steel rolls, Part II: Fracture behavior. Materials Science and Engineering: A, 1998, 254(1–2): 296–304.
Bombac D, Tercelj M, Fazarinc M, et al. On the increase of intrinsic workability and hot working temperature range of M42 ledeburitic super high steel in as-cast and wrought states. Materials Science and Engineering: A, 2017, 703: 438–450.
Ghomashchi M R, Sellars C M. Microstructural changes in as-cast M2 grade high speed steel during hot forging. Metallurgical Transactions, A (Physical Metallurgy and Materials Science), 1993, 24A: 2171–2180.
Dobrzański L A, Zarychta A, Ligarski M. High-speed steels with addition of niobium or titanium. Journal of Materials Processing Technology, 1997, 63(1–3): 531–541.
Dobrzański L A, Zarychta A, Ligarski M. Phase transformations during heat treatment of W-Mo-V 11-2-2 type high-speed steels with increased contents of Si and Nb or Ti. Journal of Materials Processing Technology, 1995, 53(1–2): 109–120.
Li Y J, Jiang Q C, Zhao Y G, et al. Improvement of the microstructure and mechanical properties of M2 cast high speed steel by modification. Journal of Materials Science Letters, 1996, 15(18): 1584–1586.
Fu H G, Du J M, Jiang Z Q, et al. Effect of RE-Al-N on structures and properties of M2 cast high speed steel. Journal of Rare Earths, 2003, 21(6): 664–668.
Zhou X F, Zhu W L, Jiang H B, et al. A new approach for refining carbide dimensions in M42 super hard high-speed steel. Journal of Iron and Steel Research, International, 2016, 23(8): 800–807.
Zhou X F, Fang F, Jiang J Q, et al. Refining carbide dimensions in AISI M2 high speed steel by increasing solidification rates and spheroidising heat treatment. Materials Science & Technology, 2014, 30(1): 116–122.
Luan Y K, Song N N, Bai Y L, et al. Effect of solidification rate on the morphology and distribution of eutectic carbides in centrifugal casting high-speed steel rolls. Journal of Materials Processing Technology, 2010, 210(3): 536–541.
Li Z B. Electroslag metallurgy theory and practice. Beijing: Metallurgical Industry Press, 2011: 66. (In Chinese)
Chen X, Jiang Z H, Liu F B, et al. Effect of melt rate on surface quality and solidification structure of Mn18Cr18N hollow ingot during electroslag remelting process. Steel Research International, 2017, 88(2): 188–196.
Zhu Q T, Li J, Zhang J, et al. Precipitation mechanism and reduction of amount of primary carbides during electroslag remelting of 8Cr13MoV stainless steel. Metallurgical and Materials Transactions B, 2019, 50B: 1365–1377.
Fischmeister H F, Riedl R, Karagöz S. Solidification of highspeed tool steels. Metallurgical & Materials Transactions A, 1989, 20(10): 2133–2148.
Mitchell A, Smailer R M. Practical aspects of electroslag remelting technology. International Metals Reviews, 1979, 5(6): 231–264.
Hernandez-Morales B, Mitchell A. Review of mathematical models of fluid flow, heat transfer, and mass transfer in electroslag remelting process. Ironmaking & Steelmaking, 1999, 26(6): 423–438.
Huang Y W, Long M J, Liu P, et al. Effects of partition coefficients, diffusion coefficients, and solidification paths on microsegregation in Fe-Based multinary alloy. Metallurgical & Materials Transactions B, 2017, 48(5): 2504–2515.
Fredriksson H. The mechanism of the peritectic reaction in iron-base alloys. Metal Science, 1976, 10(3): 77–86.
Choudhary S K, Ghosh A. Mathematical model for prediction of composition of inclusions formed during solidification of liquid Steel. ISIJ International, 2009, 49(12): 1819–1827.
Sun X L, Guo H J, Chen X C, et al. Formation mechanism of primary carbide in H13 steel during electroslag remelting process. Iron and Steel, 2014, 49(5): 68–73. (In Chinese)
Huang X H. Principle of iron and steel metallurgy. Beijing: Metallurgical Industry Press, 1990: 52. (In Chinese)
Chen J X. Date manual for charts and graphs commonly used in steelmaking, 2nd ed. Beijing: Metallurgical Industry Press, 2010: 758. (In Chinese)
Zhao Z G. Basic research on continuous casting process of high speed steel. Doctoral dissertation, Beijing: University of Science and Technology Beijing, 2018. (In Chinese)
Clyne T W, Kurz W. Solute redistribution during solidification with rapid solid state diffusion. Metallurgical Transactions A, 1981, 12(6): 965–971.
Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (No. 51904087), the Open Project of State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University (SKLASS 2019–20) and the Science and Technology Commission of Shanghai Municipality (No. 19DZ2270200), the Natural Science Foundation-Steel and Iron Foundation of Hebei Province (No. E2019202482), and Tianjin Science and Technology Project (No. 18YFZCGX00220).
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Zhi-xia Xiao Famale, born in 1984, Ph. D, Senior Engineer. Her research interests mainly focus on the electroslag remelting process, the design and manufacturing of high performance steels.
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Yin, Fx., Su, M., Ji, F. et al. Effect of melting rate on microsegregation and primary MC carbides in M2 high-speed steel during electroslag remelting. China Foundry 18, 163–169 (2021). https://doi.org/10.1007/s41230-021-9009-1
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DOI: https://doi.org/10.1007/s41230-021-9009-1