Ochonogor, OFMeacock, CPityana, Sisa LPopoola, PAIDutta Majumder, J2013-02-122013-02-122012-09Ochonogor, OF, Meacock, C, Pityana, SL, Popoola, PAI and Dutta Majumder, J. 2012. Microstructure characterization of laser-deposited titanium carbide and zirconium-based titanium metal matrix composites. The Journal of The Southern African Institute of Mining and Metallurgy, vol. 112(10), pp. 905-9100038-223Xhttp://www.saimm.co.za/Journal/v112n10p905.pdfhttp://hdl.handle.net/10204/6545Copyright: 2012 Southern African Institute of Mining and Metallurgy.Laser metal deposition (LMD) is an additive manufacturing technique whereby a stream of metal powder is consolidated by a focused laser beam on the surface of a substrate or engineering component. The interaction zone between the laser beam and powder particles is scanned superficially, generating tracks of deposited material. The tracks are overlapped in a deposition strategy in accordance with slices of a CAD model. Successive layers of material are built up to fabricate a near net shape part. In this work, the technique is used to fabricate metal matrix composites (MMCs) by using an elementally blended feedstock combining metal and ceramic powders in the melt pool, which melt and solidify to create the required morphology. Ti6Al4V + TiC MMCs were produced with 10, 20, and 30 vol.% reinforcing ceramic, and Zr + TiC MMCs were fabricated with 10, 20, and 30 vol.% TiC. The deposited thin walls were analysed using optical microscopy, scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), and indentation testing. In both systems, the analysis revealed the presence of partially melted TiC particles embedded in the metal matrix along with fine dendrites of re-solidified ceramic. The dendritic structures in the Ti-based composites were confirmed as TiC, whereas in the Zr-based composite the Zr metal reacts with the TiC to form ZrC, leaving Ti in solid solution. Both the MMCs show an increase in microhardness with increasing ceramic (carbide) content, reaching a peak HV0.1 value of 500 in the Zr- based MMC and HV0.1 of 550 in the Ti based MMC.enLaser metal depositionMetal matrix compositesTi6Al4VZirconiumTitanium carbideZirconium carbideArticleOchonogor, O., Meacock, C., Pityana, S. L., Popoola, P., & Dutta Majumder, J. (2012). Microstructure characterization of laser-deposited titanium carbide and zirconium-based titanium metal matrix composites. http://hdl.handle.net/10204/6545Ochonogor, OF, C Meacock, Sisa L Pityana, PAI Popoola, and J Dutta Majumder "Microstructure characterization of laser-deposited titanium carbide and zirconium-based titanium metal matrix composites." (2012) http://hdl.handle.net/10204/6545Ochonogor O, Meacock C, Pityana SL, Popoola P, Dutta Majumder J. Microstructure characterization of laser-deposited titanium carbide and zirconium-based titanium metal matrix composites. 2012; http://hdl.handle.net/10204/6545.TY - Article AU - Ochonogor, OF AU - Meacock, C AU - Pityana, Sisa L AU - Popoola, PAI AU - Dutta Majumder, J AB - Laser metal deposition (LMD) is an additive manufacturing technique whereby a stream of metal powder is consolidated by a focused laser beam on the surface of a substrate or engineering component. The interaction zone between the laser beam and powder particles is scanned superficially, generating tracks of deposited material. The tracks are overlapped in a deposition strategy in accordance with slices of a CAD model. Successive layers of material are built up to fabricate a near net shape part. In this work, the technique is used to fabricate metal matrix composites (MMCs) by using an elementally blended feedstock combining metal and ceramic powders in the melt pool, which melt and solidify to create the required morphology. Ti6Al4V + TiC MMCs were produced with 10, 20, and 30 vol.% reinforcing ceramic, and Zr + TiC MMCs were fabricated with 10, 20, and 30 vol.% TiC. The deposited thin walls were analysed using optical microscopy, scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), and indentation testing. In both systems, the analysis revealed the presence of partially melted TiC particles embedded in the metal matrix along with fine dendrites of re-solidified ceramic. The dendritic structures in the Ti-based composites were confirmed as TiC, whereas in the Zr-based composite the Zr metal reacts with the TiC to form ZrC, leaving Ti in solid solution. Both the MMCs show an increase in microhardness with increasing ceramic (carbide) content, reaching a peak HV0.1 value of 500 in the Zr- based MMC and HV0.1 of 550 in the Ti based MMC. DA - 2012-09 DB - ResearchSpace DP - CSIR KW - Laser metal deposition KW - Metal matrix composites KW - Ti6Al4V KW - Zirconium KW - Titanium carbide KW - Zirconium carbide LK - https://researchspace.csir.co.za PY - 2012 SM - 0038-223X T1 - Microstructure characterization of laser-deposited titanium carbide and zirconium-based titanium metal matrix composites TI - Microstructure characterization of laser-deposited titanium carbide and zirconium-based titanium metal matrix composites UR - http://hdl.handle.net/10204/6545 ER -