Laser Shock Processing As A Method For Surface Properties Modification Of Metallic Materials

Author:  Oca
Source:  Conf Proc: ICSP-9 (pg 466-471)
Doc ID:  2005126
Year of Publication:  2005
Abstract:  
ABSTRACT Laser shock processing (LSP) has been proposed as an effective technology for improving surface mechanical and corrosion properties of metals, and has been developed as a practical process amenable to production engineering. The main acknowledged advantages of the laser shock processing technique (LSP) consist in its capability of inducing of a relatively deep compressive residual stress field into metallic materials resulting in improved mechanical behaviour against fatigue crack initiation and growth, mechanical wear properties and stress corrosion without any recursion to any other subsidiary mechanical treatment. From the metallurgical point of view, laser shock processing may have various significant effects on the microstructure of processed materials. Beside more or less known effects like compressive residual stress profiles and improved fatigue resistance, some other effects on micro-scale might be found. During investigation of standard AISI 304 steel after laser shock processing, measurements of residual stress states near surface, microhardness as well as optical and electronic micrography were performed. The results showed the substantial effects of laser shock processing in every measured aspect to several 100