Influences of Laser Remelting Trajectories on Microstructures and Properties of Fe-Based Ni/WC Coatings

Yuncai Zhao; Huihui Du; Xuchao Shangguan; Wen He

doi:10.3788/LOP55.041404

Laser & Optoelectronics Progress, Volume. 55, Issue 4, 041404(2018)

Influences of Laser Remelting Trajectories on Microstructures and Properties of Fe-Based Ni/WC Coatings

Yuncai Zhao^*, Huihui Du, Xuchao Shangguan, and Wen He

School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China

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Fig. 1. Surface morphologies of coatings under different laser remelting trajectories.(a) Dotted; (b) rectangular; (c) parallel; (d) circular

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Fig. 2. Micro-morphologies of remelted layers under different laser remelting trajectories. (a) Dotted; (b) rectangular; (c) parallel; (d) circular

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Fig. 3. Element content test of coatings under circular laser remelting trajectories. (a) Area; (b) result

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Fig. 4. XRD pattern of cladding surface under circular laser remelting trajectories

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Fig. 5. Metallograph of bonding interface between coating and substrate under different remelting trajectories. (a) Dotted; (b) rectangular; (c) parallel; (d) circular

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Fig. 6. Microhardness of coatings under different remelting trajectories

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Fig. 7. Wear loss under different remelting trajectories

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Fig. 8. SEM images of coatings after dry sliding under different remelting trajectories. (a) Circular; (b) dotted

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Fig. 9. SEM image of parallel scanning trajectory after dry sliding friction

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Table 1. Chemical compositions of Fe40 Fe-based alloy powder (mass fraction, %)
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Table 1. Chemical compositions of Fe40 Fe-based alloy powder (mass fraction, %)
Element Ni Cr B Si C Fe
Content 8-12 15-20 1.5-3 1.5-3 <0.5 Bal.

Table 2. Chemical compositions of Ni60+35WC nickel tungsten carbide powder (mass fraction, %)
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Table 2. Chemical compositions of Ni60+35WC nickel tungsten carbide powder (mass fraction, %)
Element Ni Cr B Si C Fe WC
Content Bal. 15-20 3.0-4.5 3.5-5.5 0.5-1.1 ≤10 35

Table 3. Process parameters under different laser remelting trajectories
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Table 3. Process parameters under different laser remelting trajectories
Trajectory Power /W Scanning speed /(mm·min^-1) Spot diameter /mm Energy density /(W·mm^-1·s^-1)
Dotted 500 200 1.5 48
Rectangular 500 200 1.5 144
Parallel 500 200 1.5 91
Circular 500 200 1.5 97

Table 4. Experimental parameters of friction and wear
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Table 4. Experimental parameters of friction and wear
Parameter Normal load /N Rotating speed /(r·min^-1) Wear time /s Test temperature /℃
Value 350 200 1800 20

Table 5. Surface porosity of coatings under different remelting trajectories
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Table 5. Surface porosity of coatings under different remelting trajectories
Trajectory Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Average
Dotted 4.3% 4.1% 4.5% 4.2% 4.7% 4.36%
Rectangular 3.4% 3.8% 3.1% 3.5% 3.6% 3.48%
Parallel 2.2% 2.5% 2.7% 2.5% 2.8% 2.54%
Circular 2.0% 2.1% 2.5% 2.6% 2.4% 2.32%

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Yuncai Zhao, Huihui Du, Xuchao Shangguan, Wen He. Influences of Laser Remelting Trajectories on Microstructures and Properties of Fe-Based Ni/WC Coatings[J]. Laser & Optoelectronics Progress, 2018, 55(4): 041404

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