Available online at www.sciencedirect.com ScienceDirect Materials Today: Proceedings 5 (2018) 18603–18620 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 Laser Metal Deposition Influence on the Mechanical Properties of Steels and Stainless Steel Composites: A Review O.S. Fatoba 1* ; S.A. Akinlabi 2 ; E.T.Akinlabi 1 1Department of Mechanical Engineering Science, Faculty of Engineering and the Built Environment, University of Johannesburg, South Africa. 2Department of Mechanical and Industrial Engineering Technology, Faculty of Engineering and the Built Environment, University of Johannesburg, South Africa. Abstract Reported works on laser alloyed steels have been reviewed. The premature failure of engineering steels when employed in harsh working conditions is due to low hardness, poor tribological behaviour and corrosion resistance. The engineering solutions to minimize or eliminate such initiated failure lie in tailoring the surface composition and microstructure through laser surface alloying. The reviews affirm that cracks, pores and micro-segregation associated with LSA greatly affect the quality and damage the properties of the alloyed zone. The powder materials for laser alloying process must be selected based on application requirements and that the achievement of a strong fusion bond over the entire interface between the substrate and the alloyed layer is an essential aspect of laser alloying. Therefore, good wettability between the coating materials and the substrate is also required. The review established a relationship between the important process parameters (Laser power, scanning sped, powder feed rate) on the hardness, microstructure, wear and corrosion resistance of alloyed steels. Finally, to achieve a very high material efficiency, excellent laser alloyed coatings, as well as the desired properties, the right combination of the process parameters is very necessary, and this can be achieved through optimization of the process parameters. © 2018 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of Materials Processing and characterization. Keywords: LSA; Steels; laser parameters; Hardness, Corrosion resistance; Microstructure. 1. Introduction The increasing demand for materials with good performance under severe wear and corrosive conditions has resulted in development of several techniques for surface treatment of materials [1]. Many engineering materials used in industrial conditions are subjected to corrosion, wear and fatigue attack leading to rapid degradation of the material. It is for these reasons that hard coatings are produced on materials to minimize cost, energy and conserve raw materials [2]. In the modern industrial environments such as petrochemical, mining and energy, many materials are subjected to corrosive-wear, which is a major failure mode for materials under simultaneous mechanical and chemical attacks. * Corresponding author. E-mail address: drfatobasameni@gmail.com