Laser Peening Process and Its Impact on Materials Properties in Comparison with Shot Peening and Ultrasonic Impact Peening
TL;DR: The laser shock peening (LSP) process using a Q-switched pulsed laser beam for surface modification has been reviewed and enhancements in the surface micro and nanohardness, elastic modulus, tensile yield strength and refinement of microstructure which translates to increased fatigue life and fretting fatigue life, stress corrosion cracking (SCC) and corrosion resistance were addressed.
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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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Citations
On the effects of laser shock peening on fatigue behavior of V-notched AlSi10Mg manufactured by laser powder bed fusion
TL;DR: In this paper , the influence of different post-treatments including T6 thermal treatment and laser shock peening were investigated individually and synergistically together with electro-chemical polishing on microstructure, surface morphology, roughness, hardness and residual stresses as well as rotating bending fatigue behavior of V-notched LPBF AlSi10Mg samples.
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A Mechanism for Inducing Compressive Residual Stresses on a Surface by Laser Peening without Coating
Yuji Sano,Koichi Akita,Tomokazu Sano +2 more
- 18 Jun 2020
TL;DR: In this article, a phenomenological model was proposed to predict the outcome of laser peening without coating (LPwC) using a single laser pulse irradiation and a phenomenology-based approach.
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Experimental and simulation investigation on thermal-vibratory stress relief process for 7075 aluminium alloy
TL;DR: In this paper, the residual stresses before and after the processes are measured and compared, and the effectiveness of the FE models is validated. And the authors show that TVSR can evidently reduce the residual stress in aluminium alloy and the stress relief rate of TVSR for the peak stress are 20.43% and 38.56% higher than TSR and VSR, respectively.
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Effect of ultrasonic nanocrystal surface modification on elevated temperature residual stress, microstructure, and fatigue behavior of ATI 718Plus alloy
TL;DR: In this paper, the authors investigated the use of ultrasonic nanocrystal surface modification (UNSM) to improve the fatigue life of ATI 718 Plus (718Plus) at high temperature of 650 °C.
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In-situ laser shock peening for improved surface quality and mechanical properties of laser-directed energy-deposited AlSi10Mg alloy
TL;DR: In this paper , the in-situ laser shock peening method is employed for the first time to improve the surface quality and mechanical properties of L-DED-fabricated AlSi10Mg alloy.
48
References
Laser shock processing and its effects on microstructure and properties of metal alloys: a review
TL;DR: In this paper, the current status of research and development on laser shock processing of metals, also known as laser peening, using Q-switched high power lasers is reviewed and the influence of processing parameters on the laser-induced shock waves in metal components are discussed and analyzed.
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Laser shock processing of aluminium alloys. Application to high cycle fatigue behaviour
TL;DR: In this article, the role of laser shock processing (LSP) on the cyclic properties of A356, Al12Si and 7075 aluminium alloys was evaluated, and major contributors to the fatigue performance improvements were investigated in order to determine the optimum shock conditions.
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On the influence of mechanical surface treatments—deep rolling and laser shock peening—on the fatigue behavior of Ti–6Al–4V at ambient and elevated temperatures
TL;DR: In this paper, the effect of DR on the low-cycle fatigue (LCF) and high cycle fatigue (HCF) behavior of a Ti-6Al-4V alloy is examined, with particular emphasis on the thermal and mechanical stability of the residual stress states and the near-surface microstructures.
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Laser shock processing : a review of the physics and applications
TL;DR: In this paper, the authors provide an exhaustive account of current trends concerning the physics, the mechanics and the applications involved in laser shock processing (LSP) and present some general and specific data regarding the physical principles of laser shock.
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Surface nanocrystallization of 316L stainless steel induced by ultrasonic shot peening
TL;DR: In this article, a new technique was introduced to realize surface nanocrystallization (i.e., generation of a surface layer of nanostructures) on a 316L stainless steel by means of ultrasonic shot peening treatment.
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