Synthesizing of Functionally Graded Surface Composites by Laser Powder Deposition

Date
2009-09-15
Authors
Foroozmehr, Ehsasn
Sarrafi, Rouzbeh
Hamid, Syed
Kovacevic, Radovan
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Publisher
University of Texas at Austin
Abstract

Metal-ceramic composites are used extensively in surface modification. Laser cladding, as one of the surface treatment techniques, shows a promising method to deposit functionally graded layers of metal-ceramic composite. In this study, AISI 4140 and nickel as the matrix and tungsten carbide (WC), titanium carbide (TiC), and nano-WC as the ceramic parts are used in four different combinations for deposit on AISI 4140 substrates. The volume percentage of the ceramics is increased from the bottom to the top. The microstructure and micro-hardness of the samples and residual stress of the top surface of the samples are studied and compared.

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