Effect of <i>in situ</i> NbC on Microstructure and Wear Properties of Laser Cladding Co-Based Coatings

Fig. 5. Macro-morphologies of composite coatings. (a) Single channel morphology; (b) cross-section morphology of 1# coating; (c) multiple channel morphology

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Fig. 6. SEM images of different NbC/Co coatings. (a) 0%NbC/Co; (b) 5%NbC/Co; (c) 10%NbC/Co; (d) 15%NbC/Co; (e) 20%NbC/Co

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Fig. 7. Average hardness of different composite coatings

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Fig. 8. Wear rate of different composite coatings

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Fig. 9. Worn morphologies of different composite coatings. (a)(b) 0%NbC/Co; (c) 5%NbC/Co; (d) 10%NbC/Co;(e) 15%NbC/Co; (f) local magnification of 15%NbC/Co

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Table 1. Chemical composition of 42CrMo steel%
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Table 1. Chemical composition of 42CrMo steel%
Element C Si Mn S P Cr Ni Cu Mo Fe
Mass fraction /% 0.435 0.201 0.613 <0.035 0.007 0.87 <0.001 <0.030 0.142 Bal.

Table 2. Chemical composition of Co-based powder%
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Table 2. Chemical composition of Co-based powder%
Element Co Cr W Mo Si
Mass fraction /% Bal. 24.12 5.45 4.95 0.92

Table 3. Mass fraction of each composition of mixed powder%
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Table 3. Mass fraction of each composition of mixed powder%
No. Designed mass fraction of NbC Nb Cr₃C₂ Co-based
1# 0 0 0 Bal.
2# 5 4.42 3.8 Bal.
3# 10 8.84 7.6 Bal.
4# 15 13.26 11.4 Bal.
5# 20 17.68 15.2 Bal.

Table 4. Experimental parameters of laser cladding
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Table 4. Experimental parameters of laser cladding
Laser power /W Shielding gas flow /(L·min^-1) Carrier gas flow /(L·min^-1) Powder feedingrate /(g·min^-1) Scanning velocity /(mm·min^-1)
1800 35 3.5 17 280

Table 5. Experimental parameters of friction wear test
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Table 5. Experimental parameters of friction wear test
Rubber wheeldiameter /mm Rotating speed /(m·min^-1) Wear time /min Load /N Sample dimension /(mm×mm×mm)
240 140 10 130 57×25.5×6

Table 6. Chemical compositions of phases in Fig. 4
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Table 6. Chemical compositions of phases in Fig. 4
Zone Percentage of atoms /%
C O Cr Fe Co Nb Mo W
A 46.7 4.2 9.2 5.4 14.6 18.1 1.1 0.6
B 23.3 4.5 18.1 10.5 32.6 5.7 3.6 1.8
C 10.3 1.3 22.8 16.7 45.8 0.9 1.4 0.8
D 24.6 3.9 18.0 8.8 32.1 6.9 3.9 1.8
E 44.9 4.8 10.2 6.0 17.2 15.4 1.1 0.6

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Yi Wei, Chen Hui, Wu Ying, Chen Yong. Effect of in situ NbC on Microstructure and Wear Properties of Laser Cladding Co-Based Coatings[J]. Chinese Journal of Lasers, 2020, 47(3): 302010

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