The Effects of Shot Peening parameters on the subsurface properties of AA7075 T6 aluminum alloy
Journal Title: Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım ve Teknoloji - Year 2018, Vol 6, Issue 4
Abstract
Shot peening (SP) is an important mechanical surface treatment widely used to improve the fatigue life of mechanical components operating under dynamic loads which have been specifically used in automotive and aerospace industries. The enhancement of the fatigue life is achieved by preventing the crack formation and slowing crack propagation by improving the mechanical properties and the microstructure of subsurface via SP. In this study, it is aimed to investigate the variation of the subsurface microstructure and the subsurface mechanical properties of AA7075 T6 aluminum alloy shot-peened under different parameters. The subsurface hardness and microstructural variations were investigated in relation to depth depending on the shot size and the peening pressure. SP was conducted under specially designed SP system by stainless steel shots of 0.1-0.3 mm and 0.4-0.9 mm diameters under 2 and 4 bar peening pressures. Subsurface hardness values improved significantly by increasing pressure and shot size, and the depth of the hardness increased regions was increased. The depth of the microstructural region affected by SP also increased for both shot sizes. The formation of deep and large pits and surface microcracks were determined on the surface due to the excessive plastic deformation that occurs with increases in pressure and shot size.
Authors and Affiliations
Egemen AVCU
Keywords
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- EP ID EP491162
- DOI 10.29109/gujsc.389828
- Views 95
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