Room temperature and 600 °C erosion behaviour of various chromium carbide composite coatings

• Published in: Wear 2019-03, Vol.422-423, p.44-53
• Main Authors: Venkatesh, L., Venkataraman, B., Tak, Manish, Sivakumar, G., Gundakaram, Ravi C., Joshi, S.V., Samajdar, I.
• Format: Article
• Language: English
• Subjects: Bonding strength; Chromium carbide; Coatings; Cooling rate; Detonation; Dilution; Erosion mechanisms; Erosion rates; Hardness; Laser beam cladding; Laser cooling; Laser processing; Lasers; Manufacturing and materials engineering; Metal matrix composites; Oxidation; Produktions- och materialteknik; Room temperature; Solid particle erosion; Solidification; Sprayed coatings; Substrates; Thermal spray coatings
• ISSN: 0043-1648; 1873-2577; 1873-2577
• DOI: 10.1016/j.wear.2019.01.025

In this study, the erosion behaviour of laser clad chromium carbide-Ni rich alloy composite coatings with a wide range of carbide contents at room temperature and 600 °C were investigated. The variation in carbide content of the coatings was due to dilution from the substrate and the high cooling rate in the laser cladding process preventing re-solidification of the molten carbides. Erosion rate was observed to be a function of carbide content alone and was significantly higher at 600 °C as compared to room temperature. Erosion wear ratio (E90/E30) was also dependent on carbide content but decreased at higher temperature and higher carbide contents. A comparison of erosion behaviour with detonation and plasma sprayed counterparts showed the superior performance of laser clad coatings at 600 °C. The poor erosion performance of the detonation and plasma sprayed coatings was due to weak splat bonding. Thick oxide layer formed on the steel substrate after pre-oxidation resulted in its poor erosion performance. •Microstructure was strongly dependent on the processing technique.•Solid particle erosion is a function of carbide content only in laser clad coatings.•In thermal spray coatings splat bonding determines the erosion behaviour.•Increase in temperature increases the erosion rate about five times.•Under oxidising conditions steel undergoes severe erosion affected oxidation.