Abstract
This study investigates the effect of annealing on the microstructural evolution, phase formation and tribological properties of CoCrFeNiW0.3 + 5 at.% C alloy prepared using atmospheric plasma spray. The annealing has a significant effect on microstructure evolution and tribological properties. The microstructure of the CoCrFeNiW0.3 + 5 at.% C alloy exhibits the lamellar microstructure. When the annealing temperature reaches 900 °C, the carbon dissolves in the chromium and forms Cr-rich carbides phase. The coarsening of grey phases is observed with the evolution of W-rich, and Cr-rich carbides as the temperature attain 1200 °C. Phase analysis results revealed that CoCrFeNiW0.3 + 5 at.% C alloy coating comprising of FCC solid solution phase, with Cr- and W-rich phase. As the annealing temperature increases from 900 to 1200 °C, more Cr- and W-rich phase evolved. The surface morphology results indicate the increase in the surface roughness value post-heat-treatment. The dilution level investigation reveals the strong metallurgical bonding between the coating and the substrate. X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy reveal the formation of the oxidation state in detail. The average microhardness of the CoCrFeNiW0.3 + 5 at.% C alloy coating was found to be marginally decreased by increasing the annealing temperature, and the deposited coating microhardness was found to be 388.54 ± 14 HV0.2. The wear analysis test revealed a considerable decrease in wear resistance after heat treatment at 1200 °C. The wear volume rate of the as-deposited coating was found to be 7.88 × 10−5 mm3 N−1 m−1, and the coating annealed at 700, 900, and 1200 °C was 7.92 × 10−5, 8.02 × 10−5, 13.26 × 10−5 mm3 N−1 m−1, respectively.














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Acknowledgments
This study is funded by the Indian Space Research Organization (ISRO) under project no. (ISRO/RES/3/844/19-20). The authors appreciate ISRO's sponsorship. The authors thank IIT Jammu's Central Instrumentation Facility (CIF) for providing the characterization facility.
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Kumar, H., Bhaduri, G.A., Manikandan, S.G.K. et al. Effect of Annealing on Microstructural and Tribological Properties of CoCrFeNiW0.3 + 5 at.% C High Entropy Alloy. J. of Materi Eng and Perform 32, 6293–6306 (2023). https://doi.org/10.1007/s11665-022-07547-0
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DOI: https://doi.org/10.1007/s11665-022-07547-0