Available online at www.sciencedirect.com ScienceDirect Materials Today: Proceedings 5 (2018) 18362–18367 www.materialstoday.com/proceedings 2214-7853 © 2018 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of Materials Processing and characterization. ICMPC_2018 Heat affected zone Relationship with processing parameter in Additive Manufacturing Process Rasheedat M. Mahamood, Esther T. Akinlabi * Department of Mechanical Engineering Science, University of Johannesburg, Auckland Park, Kingsway Campus, Johannesburg, 2006, South Africa Abstract The microstructural development in additive manufacturing process is characterized by columnar grains that are produced as a result of globular grains that are formed in the heat affected zone during solidification of melt pool. This microstructure development also account for the evolving property disparity obtained using additive manufacturing process that is largely dependent on the processing parameters. In this study, heat affected zone produced during laser metal deposition process of laser metal deposition of titanium alloy grade five was studied. Laser metal deposition process is an additive manufacturing technology. The laser power was varied from 0.8 to 3.0 kW while other processing parameters were kept at constant values. The influence of laser power on the length of heat affected zone into the substrate was studied. The study showed that the length of heat affected zone increases with increasing laser power. The importance of this study is know the length of this heat affected zone as it relates to the laser power, the knowledge will help to know the highest power to employ for application where this heat affected zone needs to be minimized. © 2018 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of Materials Processing and characterization. Keywords: Additive manufacturin; heat affected zone; laser power; Processing parameters; microstructure. 1. INTRODUCTION Additive manufacturing method is an advanced manufacturing process that is used to build a three dimensional (3D) component from the 3D computer model of the component. Additive manufacturing technology, unlike the subtractive conventional manufacturing such as turning and milling, build 3D object through addition of materials. In the subtractive manufacturing process. *Corresponding author. E-mail address: mahamoodmr2009@gmail.com