Effect of Heat Treatment on Properties of Laser Cladding Cobalt-Based Coating on 42CrMo Steel Surface

Fig. 1. Surface morphology of coating before and after heat treatment. (a) Without heat treatment; (b) heat treatment at 500 ℃; (c) heat treatment at 700 ℃; (d) heat treatment at 900 ℃; (e) heat treatment at 1100 ℃

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Fig. 2. XRD patterns of coating before and after heat treatment. (a) Without heat treatment; (b) heat treatment at 900 ℃

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Fig. 3. Geometry diagram of laser cladding layer

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Fig. 4. Microhardness curves of coating before and after heat treatment

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Fig. 5. Friction coefficient of coating before and after heat treatment

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Fig. 6. Friction and wear morphology of coating before and after heat treatment. (a) Without heat treatment; (b) heat treatment at 500 ℃; (c) heat treatment at 700 ℃; (d) heat treatment at 900 ℃; (e) heat treatment at 1100 ℃

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Fig. 7. Polarization impedance curves of different coating samples in NaCl solution

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Fig. 8. Dynamic polarization curves of different coating samples in NaCl solution

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Table 1. Chemical composition of Stellite-6 powder
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Table 1. Chemical composition of Stellite-6 powder
Element C Cr Si W Fe Mo Ni Mn Co
Mass fraction /% 1.15 29.00 1.10 4.50 3.00 1.00 3.00 1.0 Bal.

Table 2. Process parameters of laser cladding
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Table 2. Process parameters of laser cladding
Laser powerP /W Spot diameterd /mm Scanning speedv /(m·s^-1) Overlap rateδ /% Carrier gas flux /(L·min^-1)
2500 4 8 30 4

Table 3. Electrochemical parameters of different Stellite-6 coatings in 3.5% NaCl solution

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Table 3. Electrochemical parameters of different Stellite-6 coatings in 3.5% NaCl solution

Samples	Electrochemical parameter
Samples	E_corr /V	I_corr /(A·cm^-2)	R_p /(Ω·cm²)
Without heat treatment	-0.290	3.300×10^-3	5983.7
500 ℃ heat treatment	-0.293	3.306×10^-3	6097.3
700 ℃ heat treatment	-0.298	3.284×10^-3	6433.8
900 ℃ heat treatment	-0.288	3.294×10^-3	6742.5
1100 ℃ heat treatment	-0.291	3.316×10^-3	5473.2

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Cui Chen, Wu Meiping, Xia Sihai. Effect of Heat Treatment on Properties of Laser Cladding Cobalt-Based Coating on 42CrMo Steel Surface[J]. Chinese Journal of Lasers, 2020, 47(6): 602011

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