Author(s)

B.S. Yilbas, M. Sami, A.Z. Sahin, A.Z. Al-Garni & A. Coban

Abstract

Heat transfer mechanisms in relation to laser surface melting of nitrided steel B.S. Yilba§, M. Sami, A.Z. §ahin, A.Z. Al-Garni & A. Qoban Department of Mechanical Engineering, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia ABSTRACT Surface laser upgrading techniques involving laser melting is becoming increasingly significant in industry. Such process generally aims at im- proving the surface properties, especially by enhancing the hardness of the surface layer, its resistance to wear and corrosion and/or its property gradi- ents. Temperature rise inside the material and surface cooling rate are two important factors which affect the surface properties significantly. Conse- quently, investigation into heat transfer mechanism during laser melting process becomes necessary for surface upgrading. In the present study, heat transfer model, including conduction, melting and evaporation, based on electron kinetic theory is introduced for pulsed laser

Keywords