2014•Applied Mechanics and MaterialsOpen access

Study on Microstructure and High Temperature Oxidation Resistance of Laser Cladding Coating Prepared by Ni60-TiO2-B4C-Al Powders

Fang Zhou, Hui Yao Yang, Liang He

Abstract

The composite coating with TiC-TiB2-Ni3Al was fabricated on 45 steel by laser cladding. The microstructure and high temperature oxidation resistance of coating were investigated. The results show that, the main phases of coating are α-Fe, TiC, TiB2, Ni3Al, (Fe,Cr)7C3 and Al2O3. The interface of coating and substrate material is metallurgical bond; the coating is uniform and dense without cracks and pores. The fine particles of TiC and TiB2 disperse uniformly in the coating. After oxidized at 1000°C for 60 h, the oxidation film is consisted of spherical oxides of Al, Ti and Cr, they can hinder the diffusion between oxygen and metal atoms and make the coating possess outstanding high temperature oxidation resistance.

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Key concepts: Materials science, Coating, Microstructure, Cladding (metalworking), Composite material, Metallurgy, Substrate (aquarium), Metal