Effect of WC-Reinforced Ni60AA on Cracks and Hardness

Fig. 2. Macroscopic morphologies under different specific powders and specific energies. (a) Specific energy of 140, specific powder of 12; (b) specific energy of 200, specific powder of 12; (c) specific energy of 100, specific powder of 9

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Fig. 3. Laser cladding process

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Fig. 4. Morphologies under different vibration frequencies. (a) 0 Hz; (b) 22000 Hz; (c) 28000 Hz

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Fig. 5. Microhardness change from top to bottom of cladding layer

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Fig. 6. Morphologies under different powder feeding voltage ratios. (a) 1∶4; (b) 3∶7; (c) 2∶3; (d) 3∶2

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Table 1. Mass fractions for components of Ni60AA and WC%
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Table 1. Mass fractions for components of Ni60AA and WC%
Material C Cr Si B Fe Ni WC Co
Ni60AA 0.4-0.9 13-17 3.2-4.8 2.5-4.0 ≤8.0 margin 0 0
WC 0 0 0 0 0 0 margin 8.0

Table 2. Laser processing parameters
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Table 2. Laser processing parameters
Serial number Powder feedingvoltage ratio Total powderfeeding voltage /V Laser power /W Scanningspeed /(m·s^-1)
a 3∶2 24 700 2
b 1∶1 24 700 2
c 2∶3 24 700 2

Table 3. Influence of specific powder on increase of cladding layer and maximum microhardness
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Table 3. Influence of specific powder on increase of cladding layer and maximum microhardness
Specific powder 2 4 6 8 10 12
Increase of cladding layer 0.15 0.27 0.54 0.61 0.70 0.89
Melting depth of substrate 1.04 0.89 0.76 0.68 0.55 0.37
Maximum microhardness 410 730 790 812 835 839

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Gaosong Li, Jinhua Li, Pengchao Shan, Weilong Feng. Effect of WC-Reinforced Ni60AA on Cracks and Hardness[J]. Laser & Optoelectronics Progress, 2019, 56(2): 021602

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