Microstructure Characterisation Of Laser Melt Injected WC Particles In Ti-6A1-4V.
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J.A. Vreeling, V. Ocelik & J.T.M. De Hosson
Microstructure characterization of laser melt injected WC particles in Ti-6Al-4V J.A. Vreeling, V. Ocelik, J.Th.M. De Hosson Department of Applied Physics, Materials Science Centre and Netherlands Institute for Metals Research, University ofGroningen, The Netherlands. Abstract The Laser Melt Injection (LMI) process is explored to create a protective Metal Matrix Composite (MMC) layer consisting of 80 urn sized WC particles embedded in the top layer of a Ti-6Al-4V alloy. In particular the influences of the main process parameters on the laser track dimensions and microstructure are examined. Typical dimensions of a single laser track are a width of 1.8 mm and a depth of 0.7 mm. The volume fraction of the homogeneous distributed WC particles is about 25 - 30%. Important is that by overlapping the single laser tracks larger surface areas may be treated. In the Ti-alloy melt pool matrix TiC and W dendrites are present. The bonding between the ceramic particles and metal