Microstructure and Properties of Iron-Based Alloys Coatings Prepared by High-Speed Laser Cladding

Yifei Xu; Yaoning Sun; Guojian Wang; Yongliang Gui

doi:10.3788/CJL202148.1002122

Chinese Journal of Lasers, Volume. 48, Issue 10, 1002122(2021)

Microstructure and Properties of Iron-Based Alloys Coatings Prepared by High-Speed Laser Cladding

Yifei Xu¹, Yaoning Sun^1、*, Guojian Wang¹, and Yongliang Gui²

Author Affiliations

¹College of Mechanical Engineering, Xinjiang University, Urumqi, Xijiang 830047, China

²College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, Hebei 0 63210, China

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Figures & Tables(13)

Fig. 1. Macro morphology of cladding coating

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Fig. 2. Surface roughness of cladding coating

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Fig. 3. Cross-sectional morphologies of double-layer coating. (a) Unfused particles; (b) schematic of dilution ratio

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Fig. 4. EDS spectrum of high-speed laser cladding double-layer coating

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Fig. 5. Morphologies of the cladding coating. (a) Single layer; (b) double layer; (c) four layers

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Fig. 6. SEM morphologies of high-speed laser cladding coating. (a) Whole morphology of coating; (b) coating/substrate interface zone; (c) middle zone; (d) near-surface

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Fig. 7. XRD pattern of high-speed laser cladding coating

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Fig. 8. Calculation of average grain diameter. (a) Single circle grain boundary intersection count; (b) software Nano Measurer's measurements

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Fig. 9. Microhardness distribution of double-layer coating

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Fig. 10. Corrosion resistance of substrate and cladding coating in 3.5% NaCl solution. (a) Polarization curves; (b) Nyquist diagram; (c)(d) Bode diagram

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Table 1. Chemical composition of iron-based alloy powder
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Table 1. Chemical composition of iron-based alloy powder
Element C Si Cr Ni Mo B Fe
Massfraction /% 0.15 4.5 22 13 2 1.6 Bal.

Table 2. Parameters in laser cladding process
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Table 2. Parameters in laser cladding process
Laser power /W Scanning velocity /(mm·min^-1) Powder flow rate /(r·min^-1) Overlapping rate /% Cladding efficiency /(m²·h^-1)
880 3600 3.0 50 0.243

Table 3. Electrochemical corrosion performance of substrate and cladding coating
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Table 3. Electrochemical corrosion performance of substrate and cladding coating
Sample E_corr /mV I_corr /(μA·cm^-2)
Coating -631.5 0.5267
Substrate -667 15.9478

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Yifei Xu, Yaoning Sun, Guojian Wang, Yongliang Gui. Microstructure and Properties of Iron-Based Alloys Coatings Prepared by High-Speed Laser Cladding[J]. Chinese Journal of Lasers, 2021, 48(10): 1002122

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