Kalainathan S

Department of Physics

School of Advanced Sciences

Vellore Campus

Sathyajith S

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Optics and Lasers in Engineering

Laser shock peening (LSP) is a modern and efficient thermo-mechanical approach to engineer and modify the surface and subsurface related properties of materials which has been frequently opted by contemporary researchers in the field of peening. The main objective of this review article is to emphasize LSP as a post weld treatment method which may help in the commercialization of LSP which is considered a challenge till date. Combining laser welding and laser shock peening could be an alternative and promising approach for improving weld quality over different conventional methods of post weld treatments. With this hindsight, reports incorporating welding and peening in last decades are reviewed. The notable effects of LSP on the mechanical properties and microstructure of different weldments are also discussed along with the classification and important parameters of LSP. We conclude that LSP can indeed be used as an effective post weld treatment (PWT) method in industrial manufacturing process. © 2018

Journal of Manufacturing Processes

Review: Laser shock peening as post welding treatment technique

Present competitive world is looking for Components with high strength and fatigue resistance finding their applications in aerospace, turbine parts and especially bio-medical devices with high bio-compatibility. Advanced engineering techniques are required to produce parts of higher complexities and desirable surface qualities. Laser peening stood first in a row of all various surface treatments of metallic component. A Fundamental purpose of nobility of the nearby variations in residual stress that happen inside the processed region, that are sensitive to processing variables and not effectively measured tentatively. The rule of residual.stress.is important.in guaranteeing.the nobility of engineering segments and Laser. Shock. Peening (LSP) process.can be utilized to great impact to present the gainful compressive residual. stress.levels as required. It is, nonetheless, hard to utilize ordinary laser. peening.rule.frameworks to set up the perfect peening.state that. will bring about the best.execution. This.paper. results.from.a study.to optimize the.laser.peening.parameters. for a typical. titanium. ND- YAG laser equipment was taken for the experimental work and statistical Taguchi technique was.used.to bound.the number.of experiments.necessary.for optimization.to be feasible. © 2017 Elsevier Ltd. All rights reserved.

Materials Today: Proceedings

Optimization of Laser Shock Peening For Titanium

Present competitive world is looking for Components with high strength and fatigue resistance finding their applications in aerospace, turbine parts and especially bio-medical devices with high bio-compatibility. Advanced surface engineering techniques are required to produce parts of higher complexities and desirable surface qualities. Laser peening stood first in a row of all various surface treatments of metallic component. This paper discusses about the mechanical properties like hardness and roughness then the surface morphology and the corrosion behaviour of the laser peened titanium samples with and without coating. © Published under licence by IOP Publishing Ltd.

Fulltext

IOP Conference Series: Materials Science and Engineering

Investigation of Mechanical, Microstructural and Corrosion behaviour of Titanium subjected to Laser Peening with and without Ablation

Laser peening without coating (LPwC) was performed on a Ti-2.5Cu alloy at wavelengths of 1064 and 532 nm and at a constant power density of approximately 7 GW cm−2 with overlap rates of 53%, 63% and 73%. Surface softening due to thermal interaction of laser beam with material was observed till a depth of 500 µm (at 532 nm) and 200 µm (at 1064 nm), based on hardness data. This was corroborated (rather weakly) by residual stress analysis. In addition, softening due to mechanical effects (adiabatic heating) was observed in the bulk. Although there was an increase in mechanical softening with increase in overlap rates at 532 nm, it was observed, upon comparison with peened samples at 1064 nm, that the mechanical softening is a function of wavelength of radiation used for peening. It was observed that the onset of softening was earlier if the wavelength was shorter. Further, evidence of hardening in the form of twinning was found for the 1064 nm case while it was absent for the 532 nm case, for 73% overlap. The workhardened depth was more than 1000 µm, not observed in earlier studies based on residual stress analysis. The direct consequence of softening effect was found in the fatigue results. The fatigue life extended by a factor of 1.4 and 2.3 for the samples peened at 532 nm and 1064 nm respectively, consistent with the observed wavelength dependent onset of softening. © 2016 Elsevier B.V.

Materials Science and Engineering: A

Wavelength dependent deformation in a laser peened Ti-2.5Cu alloy

Materials & Design

Warm laser shock peening without coating induced phase transformations and pinning effect on fatigue life of low-alloy steel

Journal of Materials Processing Technology

Simulation of residual stress induced by a laser peening process through inverse optimization of material models

Acta Materialia

Grain refinement mechanism of multiple laser shock processing impacts on ANSI 304 stainless steel

Applied Surface Science

Laser Shock Processing of 6061-T6 Al alloy with 1064nm and 532nm wavelengths

Numerical modeling of laser shock peening with femtosecond laser pulses and comparisons to experiments

Procedia Engineering

Effects of laser peening treatment without protective coating on axial fatigue property of aluminum alloy

Effect of laser shot peening on precipitation hardened aluminum alloy 6061-T6 using low energy laser

Journal	Data powered by TypesetOptics and Lasers in Engineering
Publisher	Data powered by TypesetElsevier BV
ISSN	0143-8166
Open Access	0