Microstructural Characterization and Cyclic Oxidation Behavior of HVOF-Sprayed Cr₃C₂-NiCr Coating on Boiler Steel at Elevated Temperature

Abstract:

The oxidation behavior of HVOF sprayed Cr₃C₂NiCr coatings on 310S stainless steel for 50 cycles in air at 700°C under cyclic conditions has been investigated in the present work. The microstructure, hardness and porosity of the coating were characterised. X-ray diffraction, field emission scanning electron microscope with energy dispersive spectroscopy and X-ray mapping were used to analyze the scales formed on the surface of the oxidised samples. The microstructure of the as sprayed coating showed uniformly distributed chrome carbide-rich ceramic grains attached with nickel chrome-rich binder phase. The Cr₃C₂-25% NiCr coated specimen exihibit negligible microspalling of the scales upon oxidation. The improved oxidation resistance of Cr₃C₂NiCr coatings may be attributed to the formation of oxides of chromium, nickel, and spinels of nickel and chromium.

• Periodical: Materials Science Forum (Volume 736)
• Pages: 289-300
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.736.289
• Online since: December 2012
• Authors: V.N. Shukla, R. Jayaganthan, V.K. Tewari
• Keywords: High Temperature Oxidation, High Velocity Oxy Fuel, Microhardness, Microstructure

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