Uniformly Dispersed Carbide Reinforcements in the Medium-Entropy High-Speed Steel Coatings by Wide-Band Laser Cladding

doi:10.1007/s40195-019-00993-1

Abstract

Abstract:

A medium-entropy high-speed steel (ME-HSS) coating with the 76 at.% of Fe and multiple alloying elements was prepared by the wide-band laser cladding. Compared with the commercial W₆Mo₅Cr₄V₂ (M2) HSS coating which contains a large number of network lamellar M₂C-type carbides along the grain boundaries, the presented ME-HSS coating has a high quantity of finer and more uniformly dispersed MC-type carbides; on the other hand, the coating has less retained austenite and much lower brittleness as well as similar secondary hardening effect and tempering hardness.

Key words: High-speed steel, Medium-entropy alloy, Phase selection, Laser cladding

Bang Dou, Hui Zhang, Jia-Hao Zhu, Ben-Qi Xu, Zi-Yi Zhou, Ji-Li Wu. Uniformly Dispersed Carbide Reinforcements in the Medium-Entropy High-Speed Steel Coatings by Wide-Band Laser Cladding[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(8): 1145-1150.

Figures/Tables 7

Table 1 Compositions and configuration entropies of the laser-cladded ME-HSS coatings

	%	C	W	Mo	Cr	V	Co	Ni	Al	Cu	Ti	Fe	Entropy
ME-HSS	at.	4.5	1.85	2.95	2.1	2.1	2.1	2.1	2.1	2.1	2.1	76	1.09R
ME-HSS	wt.	0.95	6.0	5.0	1.92	1.88	2.18	2.18	1.0	2.35	1.77	74.78	1.09R
M2-HSS	at.	4.5	1.8	2.9	4.4	2.2	-	-	-	-	-	83.9	0.69R
M2-HSS	wt.	0.95	6.0	5.0	4.0	2.0	-	-	-	-	-	82.05	0.69R

Fig. 1 a Smooth surface on the ME-HSS coating, b XRD patterns of the two coatings in the solidified state and after triple tempering at 530 °C

Fig. 2 Microstructure of the two coatings in the solidified state and after triple tempering with the label C for carbides, and M for martensite: a, b M2-HSS coating; c, d ME-HSS coating

Fig. 3 Interface microstructure between the coating and substrate with EDS scanning lines (the purple, green, red, and blue lines refer to iron, molybdenum, chromium, and tungsten elements, respectively)

Fig. 4 a Hardness variation as a function of tempering temperature, b, c cracks observation at the indentations in the M2-HSS and ME-HSS coatings, respectively

Table 2 EDS results in various regions (Fig. 2) after triple tempering at 530 °C (at%)

Coatings	Regions	C	Mo	W	Cr	V	Co	Ni	Al	Cu	Ti	Fe
M2-HSS	Carbide	4.15	15.37	8.11	10.04	8.98		-		-	-	53.35
M2-HSS	Matrix	1.41	2.75	1.89	4.35	1.72		-		-	-	87.30
ME-HSS	Carbide	7.75	13.16	10.44	2.35	10.43	0.16	0.37	0.13	2.12	14.88	38.21
ME-HSS	Matrix	2.54	1.26	0.89	1.87	1.75	3.48	3.47	4.47	3.46	0.56	76.25

Fig. 5 Microstructure in the ME-HSS coatings with thicker powder bed: a 2 mm thickness; b 1.5 mm thickness

References 27

[1]	H. Yang, X.L. Shang, L.L. Wang, Z. Wang, J.C. Wang, X. Lin, Acta Metall. Sin. 54, 905 (2018) DOI URL
[2]	B. Gludovatz, A. Hohenwarter, K.V.S. Thurston, H. Bei, Z. Wu, E.P. George, R.O. Ritchie,, Nat. Commun. 7, 10602 (2016) DOI URL PMID
[3]	H. Feng, H.B. Li, P.C. Lu, C.T. Yang, Z.H. Jiang, X.L. Wu, Acta Metall. Sin. 55, 1457 (2019) DOI URL
[4]	H. Zhang, H. Tang, W.H. Li, J.L. Wu, X.C. Zhong, Mater. Sci. Technol. -Lond. 34, 1 (2017) DOI URL
[5]	F. He, Z. Wang, M. Zhu, J. Li, Y. Dang, J. Wang, Mater. Des. 85, 1 (2015) DOI URL
[6]	Y.A. Jose, V.U. Alejandro, Z.M. Dario, P.H. Rodrigo, Mater. Sci. Eng. A 748, 244 (2019) DOI URL
[7]	M. Choi, I. Ondicho, N. Park, N. Tsuji, J. Alloys Compd. 780, 959 (2019) DOI URL
[8]	H. Zhang, Y. Pan, Y. He, H. Jiao, Appl. Surf. Sci. 257, 2259 (2011) DOI URL
[9]	M.J. Yao, K.G. Pradeep, C.C. Tasan, D. Raabe, Scr. Mater. 72-73, 5(2014)
[10]	Y.X. Zhuang, W.J. Liu, P.F. Xing, F. Wang, J.C. He, Acta Metall. Sin. (Engl. Lett.) 25, 124 (2012)
[11]	H. Tang, H. Zhang, L. Chen, S. Guo, J. Alloys Compd. 772, 719 (2019) DOI URL
[12]	H. Zhang, B. Dou, H. Tang, Y.Z. He, S. Guo, Mater. Des. 159, 224 (2018) DOI URL
[13]	X.U. Bojun, G.U. Nanju, Y. Dianran, Acta Metall. Sin. (Engl. Lett.) 3, 116 (1990)
[14]	M. Boccalini, H. Goldenstein, Int. Mater. Rev. 46, 92 (2001) DOI URL
[15]	W. Darmawan, J. Quesada, F. Rossi, R. Marchal, F. Machi, H. Usuki, J. Laser Appl. 21, 176 (2009) DOI URL
[16]	X. Zhou, D. Liu, W. Zhu, F. Fang, Y. Tu, J. Jiang. J. Iron. Steel Res. Int. 24, 43 (2017) DOI URL
[17]	F. Pan, W. Wang, A. Tang, L. Wu, T. Liu, R. Cheng, Prog. Nat. Sci. Mater. 21, 180 (2011)
[18]	S. Wei, J. Zhu, L. Xu, Mater. Sci. Eng. A 404, 138 (2005) DOI URL
[19]	V. Trabadelo, S. Giménez, I. Iturriza, Mater. Sci. Eng. A 499, 360 (2009) DOI URL
[20]	V. Keryvin, V.H. Hoang, J. Shen, Intermetallics 17, 211 (2009) DOI URL
[21]	G. Herranz, A. Romero, V. de Castro, G.P. Rodríguez, Mater. Des. 54, 934 (2014) DOI URL
[22]	H.W. Zhang, K. Nakajima, M. Su, H. Shibata, P. Hedström, W. Wang, H. Lei, Q. Wang, P.G. Jönsson, J. He, Steel Res. Int. 89, 1800172 (2018) DOI URL
[23]	X.F. Zhou, F. Fang, Y.Y. Tu, J.Q. Jiang, H.X. Xu, W.L. Zhu, Acta Metall. Sin. 50, 769 (2014) DOI URL
[24]	H. Liu, J. Liu, P. Chen, H. Yang, Opt. Laser Technol. 118, 140 (2019) DOI URL
[25]	Y. Ji, W. Zhang, X. Chen, J. Li, Acta Metall. Sin. (Engl. Lett.) 29, 382 (2016) DOI URL
[26]	H.J. Niu, I.T.H. Chang, Microstructural evolution during laser cladding of M2 high-speed steel. Metall. Mater. Trans. A 31, 2615 (2000)
[27]	C.K. Kim, J.I. Park, S. Lee, Y.C. Kim, N.J. Kim, J.S. Yang, Metall. Mater. Trans. A 36, 87 (2005) DOI URL