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Effect of Coating Thickness on the Slurry Erosion Resistance of HVOF-Sprayed WC-10Co-4Cr Coatings

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Abstract

High-velocity oxy-fuel (HVOF)-sprayed WC-10Co-4Cr coatings were deposited with thickness of 150, 300 and 450 µm in the present work. The structural and mechanical properties, adhesion strength and residual stress were analyzed as a function of coating thickness. With increasing coating thickness, an increase in hardness and a drop in fracture toughness were observed. The compressive residual stresses decreased by a factor of two with increased coating thickness from 150 to 450 µm. The elastic modulus of the coatings was influenced by their porosity. The results of the slurry erosion tests indicated a brittle erosion response of the coatings, and the ratio of the erosion rate at 90° impact angle to that at 30° impact angle increased with increasing coating thickness. The slurry erosion resistance of the coatings was governed by the impact angle, residual stresses and mechanical properties of the coatings. The main material removal mechanisms were plastic grooving of the binder phase, carbide pullout, micro-cracking and brittle fracture.

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Acknowledgements

The authors are thankful to the Director, VNIT, for providing necessary facilities in carrying out the experimental studies. The constructive suggestions and the English editing of the reviewers are greatly acknowledged.

Funding

The authors greatly acknowledge the financial assistance provided by the Naval Research Board (NRB), India, under project NRB-418/MAT/18-19.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), South Ambazari Road, Nagpur, 440010, India

    S. G. Sapate, N. Tangselwar, S. N. Paul, R. C. Rathod & Sanket Mehar

  2. Naval Materials Research Laboratory (NMRL), Ambernath, 421506, India

    D. S. Gowtam

  3. Defence Metallurgical Research Laboratory (DMRL), Hyderabad, 500058, India

    Manish Roy

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  1. S. G. Sapate
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Sapate, S.G., Tangselwar, N., Paul, S.N. et al. Effect of Coating Thickness on the Slurry Erosion Resistance of HVOF-Sprayed WC-10Co-4Cr Coatings. J Therm Spray Tech 30, 1365–1379 (2021). https://doi.org/10.1007/s11666-021-01190-2

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