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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 7/2016

26-05-2016

Laser Surface Treatment of Stellite 6 Coating Deposited by HVOF on 316L Alloy

Author: Reza Shoja-Razavi

Published in: Journal of Materials Engineering and Performance | Issue 7/2016

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Abstract

This research aimed to study the effects of laser glazing treatment on microstructure, hardness, and oxidation behavior of Stellite 6 coating deposited by high velocity oxygen fuel (HVOF) spraying. The as-sprayed Stellite 6 coating (ST-HVOF) was subjected to single-pass and multiple-pass laser treatments to achieve the optimum glazing parameters. Microstructural characterizations were performed by x-ray diffractometry and field emission scanning electron microscopy equipped with energy-dispersive spectroscopy. Two-step optimization showed that laser treatment at the power of 200 W with a scan rate of 4 mm/s causes a surface layer with a thickness of 208 ± 32 µm to be remelted, while the underlying layers retain the original ST-HVOF coating structure. The obtained sample (ST-Glazing) exhibited a highly dense and uniform structure with an extremely low porosity of ~0.3%, much lower than that of ST-HVOF coating (2.3%). The average microhardness of ST-Glazing was measured to be 519 Hv0.3 indicating a 17% decrease compared to ST-HVOF (625 Hv0.3) due to the residual stress relief and dendrite coarsening from submicron size to ~3.4 µm after laser treatment. The lowest oxidation mass gain was obtained for ST-Glazing by 2 mg/cm2 after 8 cycles at 900 °C indicating 52 and 84% improvement in oxidation resistance in comparison to ST-HVOF and bare 316L steel substrates, respectively.
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Metadata
Title
Laser Surface Treatment of Stellite 6 Coating Deposited by HVOF on 316L Alloy
Author
Reza Shoja-Razavi
Publication date
26-05-2016
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 7/2016
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-016-2138-9

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