Influence of Laser Remelting on Tensile Properties of Nanocomposite Ni–Al₂O₃ Coatings

Abstract

Ni–Al₂O₃ nanocomposition coatings were fabricated onto the surface of steel (grade 45) substrates using jet electroplating technology followed by laser remelting. The microstructure of the Ni–Al₂O₃ nanocomposite coating and the laser remelted layer were analysed. The surface composition was analysed using energy-dispersive X-ray spectroscopy (EDS). The tensile properties of the composite coating before and after laser irradiation were measured. The results show that for optimized testing parameters jet electroplating technology can produce 3.58 mass%. Ni–Al₂O₃ nanocomposite coatings. The tensile strength and percentage elongation of the test specimen with nanocomposite coating are better than substrate material. Laser remelting further improved the tensile strength and percentage elongation of the test-specimen.