Effect of Laser Surface Treatment on Some Mechanical Properties of Low Carbon Steel

Abstract

This research aims to study the effect of localized laser surface treatment onmechanical behavior of low carbon steel. Laser Cw Nd : YAG was used in thetreatment hardening of the specimens for different laser energy (2.7,3.3,4.37100J ),with time interval for the beam (10-2 sec) and the laser intensity(4500,5500,7100Watt/mm2) . Different mechanical tests were achieved Static and Dynamic on thespecimens which were surface treated .Static tests included ( Tensile test,Microhardness test) ,While the dynamic test included (Impact test ).The results show that the mechanical properties for low carbon steel H[.hxstrength by(0.9,10,25.5%) , ultimate tensile strength by(6.4,16.24,24.59%),while theincrement fracture stress by (12,17.28,34.87%),also increment in microhardness by(3.4, 5 , 23% )and toughness by (4.3,10.86,20.8 %). Some of mechanical propertiesfor low carbon steel reduce with increasing in laser energy which show in Youngmodulus (26.06,40.89,50.8%), Rigidity modulus by (25,40.5,48.99 %) , Poisson s,ratio (1.29,2.34,3.69%) .