Title: Laser melt injection of ceramic particles in metals: processing, microstructure and properties

Authors: V. Ocelik, J.Th.M. De Hosson

Addresses: Department of Applied Physics, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands. ' Department of Applied Physics, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

Abstract: The objective of this paper is to present an overview of the possibilities of the laser melt injection (LMI) methodology to enhance the surface of light-weighted metals by adding hard ceramic particles in the top layer, with the aim to enhance the wear resistance and to increase the hardness. In particular, the LMI process and the resulted microstructures are exemplified on two material systems, i.e., SiC particles in Al and WC particles in Ti-6Al-4V. The microstructural response on loading of both systems is studied by in situ deformation tests and the microstructure is analysed in detail by advanced microscopy techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM) and orientation imaging microscopy (OIM). It is shown that the LMI method is a suitable technique to create a MMC layers on metal substrates. The formation of reaction layers between the particles and the matrix may have a positive contribution on the bond strength between the particles and the matrix. However, the amount of reaction products in the matrix of the coatings should be minimised to improve the properties of the MMC layers.

Keywords: laser melt injection; LMI; silicon carbide; aluminium; tungsten carbide; scanning electron microscopy; SEM; transmission electron microscopy; TEM; orientation imaging microscopy; OIM; deformation tests; ceramic particles; wear resistance; hardness; microstructure; titanium alloys.

DOI: 10.1504/IJMMP.2010.035936

International Journal of Microstructure and Materials Properties, 2010 Vol.5 No.2/3, pp.116 - 163

Available online: 10 Oct 2010 *

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