Increasing Solidification Rate of M2 High-Speed Steel Ingot by Fusible Metal Mold

doi:10.1007/s40195-016-0398-x

Abstract

Abstract:

As one of the most popular used high-speed steels, M2 possesses excellent hardness and toughness as cutting tools. Networks of eutectic carbides distributing in the inter-dendritic region are academically considered to be the typical microstructure of M2, which can be refined by increasing cooling rate. In this paper, a novel casting method named fusible metal mold (FMM) is employed to refine the microstructure of M2 high-speed steel. Results show that FMM casting method can improve cooling rate by 100% without any contamination of the melts’ composition.

Key words: Carbide, Cooling, rate, Solidification, process, Microstructure, Dendritic, spacing

Yan-Liang Ji, Wei Zhang, Xiao-Yang Chen, Jian-Guo Li. Increasing Solidification Rate of M2 High-Speed Steel Ingot by Fusible Metal Mold[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(4): 382-387.

Figures/Tables 6

Fig. 1 a Schematic representation of the mold used and b macrostructure of the ingot, a-f the microstructure locations observed by optical microscope

Fig. 2 Microstructures of the as-cast ingot made by FMM a, b, c, PMM d, e, f: a, d measured on the surface, b, e10 mm under the surface, c, f 25 mm under the surface

Fig. 3 Experimental cooling rate of the ingot obtained by FMM and PMM casting method

Fig. 4 SEM images of M 2C at 10 mm under the ingot surface: a FMM side, b PMM side

Table 1 Compositions of eutectic carbides in M2 high-speed steel (at.%)

Examine region	C	V	Cr	Fe	Mo	W
FMM	35.2 ± 0.1	8.4 ± 0.1	7.5 ± 0.1	5.1 ± 0.1	15.8 ± 0	28.0 ± 0.3
PMM	61.2 ± 0.1	6.1 ± 0.1	3.3 ± 0	2.9 ± 0.2	8.4 ± 0	18.0 ± 0.4

Fig. 5 Aluminum content examined from the surface of the ingot on FMM side

References 22

[1]	M. Boccalini, H. Goldenstein, Int. Mater. Rev. 46, 92(2011)
[2]	X.F. Zhou, F. Fang, J.Q. Jiang, W.L. Zhu, H.X. Xu, Mater. Sci.Technol. Lond. 30, 116(2014)
[3]	M.G. Qu, S.H. Sun, X.H. Bai, Z.P. Shi, Y. Gao, W.T. Fu, J. Iron.Steel Res. Int. 21, 60(2014)
[4]	X.F. Zhou, F. Fang, J.Q. Jiang, China Foundry 8, 290 (2011)
[5]	P.D. Ding, C.D. Zhang, B. Jiang, S.Z. Zhou, Iron Steel 41, 63(2006)
[6]	S.H. Suh, J. Choi, T. Iron Steel I. Jpn. 26, 305(1986)
[7]	M. Murgasˇ, A.S. Chaous, A. Pokusa, M. Pokusova´, ISIJ Int. 40,980(2000)
[8]	F. Cajner, V. Leskovsˇek, D. Pustaic´, Key Eng. Mater. 592-693,680(2014)
[9]	J. Arias, M. Cabeza, G. Castro, I. Feijoo, P. Merino, G. Pena,Weld. Int. 27, 1(2013)
[10]	M.C. Huang, C.H. Gao, L.G. Huang, Acta Metall. Sin. (Engl.Lett.) 16, 524(2003)
[11]	S.S. Gill, J. Singh, R. Singh, H. Singh, J. Mater. Eng. Perform.21, 1320(2012)
[12]	A.S. Chaus, Mater. Sci. Technol. Lond. 30, 1105(2014)
[13]	Y.L. Li, Q.C. Jiang, Y.G. Zhao, Z.M. He, X.Y. Zhong, J. Rare Earth 18, 134 (2000)
[14]	L. Zeng, W. Zhang, Y.L. Ji, Y.J. Huang, J.G. Li, Metall. Mater.Trans. A 46, 2819 (2015)
[15]	S. Shao, Y. Liu, C.S. Xu, Y.X. Xu, B. Wu, X.S. Zeng, X.F. Lu,X.J. Yang, Acta Metall. Sin. (Engl. Lett.) 28, 7(2015)
[16]	T. Loulou, E.A. Artyukhin, J.P. Bardon, Int. J. Heat Mass Tran.42, 2129 (1999)
[17]	M. Trovant, S. Argyropoulos, Metall. Mater. Trans. B 31, 75(2000)
[18]	M.R. Karimi, M. Sedighi, D. Afshari, Int. J. Adv. Manuf.Technol. 77, 885(2015)
[19]	K.A. Chiang, Y.C. Chen, Mater. Lett. 59, 1919 (2005)
[20]	H. Fredriksson, S. Brising, Scand. J. Metall. 5, 268(1976)
[21]	H. Fredriksson, M. Nica, Scand. J. Metall. 8, 243(1979)
[22]	P.D. Ding, G.Q. Shi, S.Z. Zhou, Mater. Charact. 29, 15(1992)