Abstract
This paper presents the after effect of laser shock peening (LSP) on AA2024 alloy specimen irradiated with the L-Spiral scanning pattern at different pulse energies. The surface morphology indicates an increase in surface roughness after LSP. The X-Ray diffraction analysis of the LSP treated specimens were compared with the untreated specimen. The sin<sup>2</sup>Ψ method of the X-ray diffraction technique indicates an improvement in the magnitude of compressive residual stress distribution after LSP. The hardness profile after LSP also shows substantial increment. The results suggested an improvement in the microstructural structure owing to the ultra-high strain rate deformation and refined grains. The High Score Plus software is used to analyse the crystallite size and microstrain of the alloy treated by different pulse energies.
Highlights
After high power lasers were developed, attention has shifted to laser surface modification processes and one of the applications growing rapidly is laser shock peening (LSP)
LSP is capable of improving the surface and mechanical properties with short pulse and high peak power laser beam density (GW/cm2) to generate a plasma at high pressure to induce compressive residual stress layer on the surfaces of metallic materials [3, 6, 7]
It has been indicated by most of the researches that LSP improves the mechanical properties and fatigue life of aluminium alloys significantly owing to the compressive residual stresses
Summary
After high power lasers were developed, attention has shifted to laser surface modification processes and one of the applications growing rapidly is laser shock peening (LSP). LSP is capable of improving the surface and mechanical properties with short pulse (ns level) and high peak power laser beam density (GW/cm2) to generate a plasma at high pressure to induce compressive residual stress layer on the surfaces of metallic materials [3, 6, 7]. Considerable studies have been done to examine the effects of LSP on both mechanical properties and fatigue live enhancement on aluminium alloys [2, 9,10,11]. It has been indicated by most of the researches that LSP improves the mechanical properties and fatigue life of aluminium alloys significantly owing to the compressive residual stresses. Few studies have been focused on the effects of LSP with different energies on the surface morphology and mechanical properties with reference to the laser irradiating scanning pattern
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