Heat treatment effect on wear behaviour of HVOF-sprayed near-nanostructured coatings
Ben Mahmud, T. Khan, Tahir I. Farrokhzad, M.A.
Ben Mahmud, T.
Khan, Tahir I.
Farrokhzad, M.A.
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2017
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2016-10-31
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Abstract
This study investigates the effect of heat treatment on changes in microstructure and wear behaviour of WC-NiCr coatings. Two feedstock powders with a similar chemical composition and different particle sizes (near nano-structured WC-17NiCr and microstructured WC-15NiCr) were used. High-velocity oxyfuel spraying technique was used to deposit coatings on to a mild steel substrate using identical spraying parameters. Coated samples were then heat treated in a nitrogen atmosphere at 500 and 700°C. The effect of heat treatment on changes in hardness and wear performance of the coatings was studied using microstructural analysis, micro-hardness indentation and abrasive wear tests. The results showed that the heat treatment increased the hardness of both coatings and a corresponding increase in wear resistance was recorded. The formation of a brittle CrWO4 phase in the microstructured coating resulted in brittle fracture of the coating and this gave lower wear resistance compared to the nanostructured coatings.
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Ben Mahmud T, Khan TI and Farrokhzad MA (2016) Heat treatment effect on wear behaviour of HVOF-sprayed near-nanostructured coatings. Surface Engineering. 33(1): 72-82.
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