Dry Sliding Wear Behaviour of Oil Jet Peened Aluminium Alloy, AA6063-T6

Abstract

Oil jet peening makes use of high-pressure oil jet to impart compressive residual stresses on the surface of metallic materials in order to improve the surface properties. This article reports the dry sliding wear characteristics of oil jet peened aluminium alloy, AA6063-T6. The presence of compressive residual stress and high hardness improves the wear resistance of oil jet peened surfaces. Changes in the hardness, surface morphology, and residual stress distribution due to peening affect the tribological behaviour. The initial and steady-state coefficient of friction are less in the treated samples compared to untreated samples. The scanning electron microscope images of the worn surfaces reveal the dominant adhesive and mild abrasive form of wear.

Fretting wear behavior of fine grain structured aluminium alloy formed by oil jet peening process under dry sliding condition

“…The samples were oil jet peened at different transverse nozzle traveling velocities, 0.5 and 2 mm/s to attain different peening intensity. As the nozzle traveling velocity varies, the time of exposure of the target [7,10]. The oil used for peening is anti-wear hydraulic oil grade, ISO VG 68.…”

“…Fretting process involves the effects of running conditions, environmental conditions and material properties. Increasing the surface strength of the metallic materials by application of surface modification methods is expected to be the unique solution to improve the resistance against fretting and dry sliding wear behavior [6,7]. Surface strengthening can be achieved by severe surface deformation processes such as shot peening, water jet peening, laser shock peening, deep rolling, low plasticity burnishing, oil jet peening, controlled ball impact peening and ultrasonic shot peening Oil jet peening, a new surface enhancement technique is developed for inducing compressive residual stresses on the surface of the metallic materials along with the formation of ultrafine grain structure at the surface [8][9][10].…”

“…Photograph of the fretting wear test rig [1].dislocation density. The nozzle traveling velocity, peening duration, coverage and number of overlapping impacts on the target surface determined the hardness and depth of compressive residual stress produced, which inturn affects the grain size induced and friction and wear properties[7,10].…”