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Influence of Postprocessing on Microstructural and Tribological Behavior of HVOF-Sprayed HEA Coating

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Tribology for Energy, Environment and Society (ICOIT 2022)

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

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Abstract

Nowadays, high entropy alloys (HEA) are getting much attention because of their superior properties, including high strength, wear-corrosion resistance, biocompatibility, thermal stability, etc. High Velocity Oxy Fuel (HVOF) process is widely employed to develop HEA coatings owing to its better bonding strength, less porous, and less oxide properties. However, the moderate working temperature of HVOF process, amongst other thermal spray techniques, results in poor adhesion among the splats, forming minute cracks in the coating. In the present work, the as-sprayed coating was annealed to different temperatures and analyzed the effect of heat treatment on coating strength, microstructure, and tribological properties. The coating was heat-treated at various temperatures of 700, 900, and 1100 °C, respectively, using a muffle furnace and compared the microstructural, mechanical, and tribological properties with the as-sprayed coating. The microstructural changes in the coating, feedstock, and worn surfaces were characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis. The hardness of the coating was measured using a nanoindenter, and the phase analysis was performed by an X-ray diffractometer (XRD). A multifunction tribometer was used to record the heat-treated coatings’ wear rate and coefficient of friction (COF). The dual-phase (BCC + FCC) behavior was responsible for the heat-treated HEA coatings’ superior mechanical and tribological behavior.

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Authors and Affiliations

  1. Centre for Automotive Research and Tribology, Indian Institute of Technology Delhi, New Delhi, India

    N. V. Abhijith & Deepak Kumar

Authors
  1. N. V. Abhijith
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  2. Deepak Kumar
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Correspondence to N. V. Abhijith .

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Editors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, Delhi, India

    Sujeet Kumar Sinha

  2. Centre of Automotive Research and Tribology, Indian Institute of Technology Delhi, Hauz Khas, Delhi, India

    Deepak Kumar

  3. Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, Delhi, India

    Nitya Nand Gosvami

  4. Materials Design and Innovation, University at Buffalo, State University, Buffalo, NY, USA

    Prathima Nalam

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Abhijith, N.V., Kumar, D. (2024). Influence of Postprocessing on Microstructural and Tribological Behavior of HVOF-Sprayed HEA Coating. In: Sinha, S.K., Kumar, D., Gosvami, N.N., Nalam, P. (eds) Tribology for Energy, Environment and Society. ICOIT 2022. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-9264-5_15

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  • DOI: https://doi.org/10.1007/978-981-99-9264-5_15

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  • Publisher Name: Springer, Singapore

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  • Online ISBN: 978-981-99-9264-5

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