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      Laser Peening Process and Its Impact on Materials Properties in Comparison with Shot Peening and Ultrasonic Impact Peening

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          Abstract

          The laser shock peening (LSP) process using a Q-switched pulsed laser beam for surface modification has been reviewed. The development of the LSP technique and its numerous advantages over the conventional shot peening (SP) such as better surface finish, higher depths of residual stress and uniform distribution of intensity were discussed. Similar comparison with ultrasonic impact peening (UIP)/ultrasonic shot peening (USP) was incorporated, when possible. The generation of shock waves, processing parameters, and characterization of LSP treated specimens were described. Special attention was given to the influence of LSP process parameters on residual stress profiles, material properties and structures. Based on the studies so far, more fundamental understanding is still needed when selecting optimized LSP processing parameters and substrate conditions. A summary of the parametric studies of LSP on different materials has been presented. Furthermore, enhancements in the surface micro and nanohardness, elastic modulus, tensile yield strength and refinement of microstructure which translates to increased fatigue life, fretting fatigue life, stress corrosion cracking (SCC) and corrosion resistance were addressed. However, research gaps related to the inconsistencies in the literature were identified. Current status, developments and challenges of the LSP technique were discussed.

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          Most cited references207

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          Laser shock processing and its effects on microstructure and properties of metal alloys: a review

          C Montross (2002)
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            Laser shock processing of aluminium alloys. Application to high cycle fatigue behaviour

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              Laser shock‐induced microstructural and mechanical property changes in 7075 aluminum

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                Author and article information

                Contributors
                Role: External Editor
                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                10 December 2014
                December 2014
                : 7
                : 12
                : 7925-7974
                Affiliations
                [1 ]Department of Mechanical and Industrial Engineering, Concordia University, 1455 De Maisonneuve Blvd. W., Montreal, QC H3G 1M8, Canada; E-Mail: a_gujba@ 123456encs.concordia.ca
                [2 ]Department of Mechanical and Materials Engineering, Masdar Institute, Masdar City, P.O. Box 54224, Abu Dhabi, UAE
                Author notes
                [* ]Author to whom correspondence should be addressed; E-Mail: mmedraj@ 123456encs.concordia.ca ; Tel.: +1-514-848-2424 (ext. 3146); Fax: +1-514-848-3175.
                Article
                materials-07-07925
                10.3390/ma7127925
                5456420
                194fdc3d-5c01-46c7-a5ea-e4bb26eb23d6
                © 2014 by the authors;

                licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 17 October 2014
                : 18 November 2014
                : 27 November 2014
                Categories
                Review

                laser shock peening,shot peening,ultrasonic impact peening,compressive residual stresses,hardness,microstructure,fatigue life

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