Microstructure and Properties of Tempered High Vanadium Semi High Speed Steel Alloy Cladding Layer

doi:10.12068/j.issn.1005-3026.2024.05.004

Abstract

Abstract:

In order to meet the demand for rapid repair of roll surface， laser cladding technology was used to clad the self?designed and prepared high vanadium semi high speed steel alloy powder on the surface of roll alloy steel. Considering the difference between the structures of forged steel roll and laser cladding layer， in order to stabilize the structure， the cladding layer was tempered with 500 ℃ and 2 h. The results show that the phase composition of the cladding layer is mainly martensite. The surface of the cladding layer is mainly fine equiaxed crystal， and the intragranular martensite is distributed in parallel in needle shape，which is decomposed into ferrite and carbide after tempering. The average hardness of the cross?section of the cladding layer is 663.4 HV， 1.8 times that of the substrate. The average friction coefficient of the cladding layer is 0.708， the wear rate is 6.142×10^-6 mm³·N^-1·m^-1， the wear performance is 25 times higher than that of the substrate， and the wear morphology is good， in accordance with the wear amount results.

Key words: laser cladding, tempering, semi high speed steel, microstructure, wear resistance

CLC Number:

TG 142.1

Hang SUN, Wei CHEN, Chang LUO, Chang-sheng LIU. Microstructure and Properties of Tempered High Vanadium Semi High Speed Steel Alloy Cladding Layer[J]. Journal of Northeastern University(Natural Science), 2024, 45(5): 636-642.

Figures/Tables 12

Table 1 The composition of roller alloy steel and high vanadium semi high speed steel alloy powder

材料	C	Si	Mn	Cr	Ni	Mo	V	Fe
基体	0.74	0.70~0.90	0.25~0.45	5.00~5.50	0.25	0.96	0.40	余量
半高速钢合金粉末	0.74	—	—	—	—	—	1.60	余量

Fig.1 Alloy powder morphology and schematic diagram of laser cladding

Fig.2 Metallographic microstructure of the cladding layer in cross section before and after tempering

Fig.3 Microstructure of cladding layer before and after tempering

Fig.4 X‐ray diffraction pattern of cladding layer before and after tempering

Fig.5 Microstructure of network carbide after deep corrosion of cladding layer

Table 2 Analysis results of carbides in figure 5c （mass fraction）

点	C	Fe	V	Cr	Mo	Si
1	21.60	48.54	6.73	8.95	13.72	0.47
2	24.80	33.20	4.34	15.88	21.37	0.41
3	2.59	85.66	0.55	4.54	3.34	0.33

Fig.6 Element distribution diagram correspanding to figure 5c

Fig.7 Average hardness change curves of cladding layer before and after tempering

Fig.8 Friction and wear test results of laser cladding layer and substrate

Table 3 Friction and wear test results of laser cladding layer

样品	磨痕宽度/mm	磨损体积/mm³	磨损率/（mm³·N^-1·m^-1）	最大摩擦系数
基体	1.865	1.112 89	154.567×10^-6	0.783
熔覆层	0.656	0.044 42	6.142×10^-6	0.708

Fig.9 Wear morphology of cladding layer and substrate

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