Optimization of Laser Surfacing Technology and Its Effect on Coating Properties

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Abstract

The paper considers the results of metallographic and tribotechnical tests of the zones of laser surfacing of the sublayer with a powder containing Fe-Co-Cr-Mo and a composite charge Ni-Cr-B-Si+WC on steel samples 40Kh. It is shown that processing using transverse beam vibrations normal to the scanning velocity vector increases the productivity of the surfacing process. The application of a sublayer not prone to cracking improves the quality of deposited coatings with the addition of a carbide phase, eliminates the formation of cracks in the deposited charge with carbides. An increase in the energy density above the optimal values leads to partial dissolution of carbides, evaporation of carbon, a decrease in the thickness of the sublayer and mixing with the charge with the carbide phase and a decrease in the microhardness of coatings. Laser surfacing at optimal conditions allowed to increase the abrasive wear resistance when tested with loose grains by 11 times compared to the base steel.

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About the authors

Vladimir P. Biryukov

Mechanical Engineering Research Institute of the Russian Academy of Sciences (IMASH RAN)

Author for correspondence.
Email: journal@electronics.ru
ORCID iD: 0000-0001-9278-6925

Cand. of Scin.(Eng.)

Russian Federation, Moscow

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Supplementary files

Supplementary Files
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2. Fig. 1. Cross-section of laser surfacing zones with an oscillating beam ×50: a) sublayer Fe-Co-Cr-Mo; b) main layer Ni-Cr-B-Si+WC

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3. Fig. 2. Microstructure of surfacing zones at the boundary with the base material with a beam diameter of 3 mm ×200: a) P = 700 W, V = 7 mm/s; b) P = 1000 W, V = 7 mm/s

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4. Fig. 3. Graphs of the microhardness of coatings depending on the layer depth: a) P = 1 000 W, V = 7 mm/s; b) P = 1 000 W, V = 5 mm/s

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5. Fig. 4. Distribution of elements in the deposited layer Ni-Cr-B-Si+WC (a), tungsten (b), nickel (c), iron (d), chromium (e), carbon (f)

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6. Fig. 5. Weight loss of samples during wear by free abrasive grain: 1 – 40Kh steel, 2 – Ni-Cr-B-Si+WC, 96 J/mm2, 3 – Ni-Cr-B-Si+WC, 48 J/mm2

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Copyright (c) 2023 Biryukov V.P.

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