The effect of laser shock peening on fatigue life using pure water and hydrofluoric acid as a confining layer of Al-Alloy 7075-T6

Abstract EN

Laser shock peening (LSP) is deemed as a deep-rooted technology for stimulating compressive residual stresses below the surface of metallic elements.

As a result, fatigue lifespan is improved, and the substance properties become further resistant to wear and corrosion.

The LSP provides more unfailing surface treatment and a potential decrease in microstructural damage.

Laser shock peening is a well-organized method measured up to the mechanical shoot peening.

This kind of surface handling can be fulfilled via an intense laser pulse focused on a substantial surface in extremely shorter intervals.

In this work, Hydrofluoric Acid (HF) and pure water as a coating layer were utilized as a new technique to improve the properties and to harden the treated surface of the Al -alloy 7075-T6.

Fatigue life by means of laser peened workpieces was improved to 154.3%, 9.78%, respectively, for Hydrofluoric (HF) and pure water compared to un-peened specimens.

And the outcomes of Vickers hardness test for laser shock peening with acid and pure water as well as un-peened specimens were 165.2HV30, 143.95HV30 and 134.7HV30, respectively showed a significant improvement in the hardness property.