Mahmoud Moradi - Department of Mechanical Engineering, Faculty of Engineering, Malayer University, P.O.B. ۶۵۷۱۹-۹۵۸۶۳, Malayer, Iran.Laser Materials Processing Research Center, Malayer University, Malayer, Iran
Mojtaba Karami Moghadam - Department of Mechanical Engineering, Faculty of Engineering, Malayer University, P.O.B. ۶۵۷۱۹-۹۵۸۶۳, Malayer, Iran.Laser Materials Processing Research Center, Malayer University, Malayer, Iran
Zeynab Pourmand - Department of Mechanical Engineering, Faculty of Engineering, Malayer University, P.O.B. ۶۵۷۱۹-۹۵۸۶۳, Malayer, Iran.Laser Materials Processing Research Center, Malayer University, Malayer, Iran
Alireza Hakimi - Department of Mechanical Engineering, Faculty of Engineering, Malayer University, P.O.B. ۶۵۷۱۹-۹۵۸۶۳, Malayer, Iran.Laser Materials Processing Research Center, Malayer University, Malayer, Iran

Nowadays laser material processing has an effective rule in the manufacturing processes. for instance, laser welding, laser cutting, laser engraving, laser additive manufacturing, etc. the laser treatment is one of a suitable application for improving the surface mechanical and tribological properties (such as microhardness and corrosion behavior) . In the present work, the laser surface treatment conducted by using a Fiber and Nd:YAG lasers (that are industrial lasers) to evaluate the micro-hardness behavior of 316L stainless steel. Based on trends of micro -hardness, the process variables parameters for Fiber laser were Focal plane position (80-100mm) and scanning speed (1-5 mm/s) whereas the laser power was considered as a constant factor (500W). Also, in Nd:YAG laser the scanning speed (2-2.7 mm/s), Focal plane position (34-40) and laser power (140- 150 W) were input parameters. Results show that the Fiber and Nd:YAG laser not suitable for 316L laser surface treatment. By decreasing the scanning speed, heat input increase and lead to surface melting.

Industrial Lasers; 316L Stainless Steel; Micro-hardness; Laser Surface Treatment.