2001, Volume 3, Issue 10
Strategic Study of CAE >> 2001, Volume 3, Issue 10
Study on the Microstructure of Laser Clad NiCrAl-Ceramic Coating
Kunming University of Science and Technology, Kunming 650093, China
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Abstract
A (TiO2 + B2O3 + Al2O3 + TiB2)/NiCrAl metal-ceramic coating was fabricated on a steel (Chinese brand 40Cr) surface by laser. TiB2, Al2O3 were introduced by an in-situ reaction of Al, B2O3 and TiO2 during laser cladding process. The microstructure, phase, element distribution and micro-hardness were analyzed with the aid of microscope, X-ray diffraction, electron probe and micro-hardness tester. Experimental results show that the γ-Ni, γ´，AI2O3 and TiB2 are the dominant phases in the cladding zone. Laser processing parameters as well as the chemical composition of coatings determine the microstructure and hardness of the cladding layer. The hardness and the boundary strength are significantly enhanced due to the presence of ceramic in the coating.
Keywords
laser cladding ; metal-ceramic coating ; microstructure ; phases ; micro-hardness
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