Abstract
This paper presents the results of our study of the contact endurance of laser-clad chromium–nickel coatings of the NiCrBSi system with different contents of chromium, boron, and carbon (PG-SR2, containing 0.48% C, 14.8% Cr, 2.1% B wt %; and PG-10N-01, containing 0.92% C, 18.2% Cr, 3.3% B wt %) and with additions of carbides of titanium TiC (15 and 25 wt %) and chromium Cr3C2 (15 wt %) upon contact fatigue loading according to the scheme of the pulsing non-impact “sphere-to-surface” contact. It has been established that the contact endurance of chromium–nickel coatings with different chemical compositions and different dispersity of structure is determined by their ability to resist plastic deformation under the conditions of repeated elastic–plastic deformation upon the mechanical non-impact contact action. This study has shown that composite coatings can be created, which contain large (50–150 μm) particles of the strengthening phases, whose contact endurance will not be substantially inferior to the contact endurance of coatings with fine (1–10 μm) strengthening phases. An estimation of the ability of the surface of the coatings to resist the mechanical contact action was made with the use of the data on microindentation. It has been shown that the method of microindentation (single loading) can be used for determining the ability of chromium–nickel coatings to withstand repeated contact loadings.
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ACKNOWLEDGMENTS
The work was performed within the framework of the state task for the Institute of Engineering Science, Ural Branch, Russian Academy of Sciences, according to the theme no. AAAA-A18-118020790147-4. The scanning electron microscopy and the mechanical and micromechanical tests were performed at the Center of the Collaborative Access “Plastometriya” of the Institute of Engineering Science, Ural Branch, Russian Academy of Sciences. The author is grateful to the Doct. of Eng. Sci. A.V. Makarov for participation in the discussion of results, to Cand. of Eng. Sci. I.Yu. Malygina and to Cand. of Eng. Sci. N.N. Soboleva for their assistance in conducting these studies, and to Cand. of Eng. Sci. A.L. Osintseva for the application of coatings by the method of laser cladding.
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Savrai, R.A. Resistance of Laser-Clad Chromium–Nickel Coatings to Failure under Contact Fatigue Loading. Phys. Metals Metallogr. 119, 1013–1021 (2018). https://doi.org/10.1134/S0031918X18100113
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DOI: https://doi.org/10.1134/S0031918X18100113