Experimental Investigation in Water Jet Peening on Al 6063 T6 Alloy

Abstract

Water jet peening (WJP) is a modern non-traditional surface treatment process newlinethat is used to improve the surface integrity of a material. In this study Al newline6063-T6 aluminium alloy is subjected to Water jet peening surface treatment. newlineThe input process parameters considered are water jet pressure, standoff newlineDistance and Traverse rate and the response parameters used in this study newlinewere Hardness and Surface roughness. In present work, the experiments are newlinecarried out by Box-Behnken Design (BBD) by Response Surface newlineMethodology (RSM) techniques, which are used to study influential factors on newlineWater jet peening process parameters. In the present study the influence of hardness and surface roughness during the newlinesingle pass and two pass treatments were studied during water jet peening on newlineAl 6063-T6 alloy. The specimen surfaces were treated with multiple passes. newlineThe input parameters considered in the present work are water pressure, newlinestandoff distance, and traverse rate. The experimental result indicates that newlinethere is a significant improvement in the hardness and surface roughness of the newlinepeened sample over the base sample. The experiment also shows an increase newlinein the microhardness up to 26% in single-pass treatment and up to 34% in newlinedouble pass treatments and surface roughness of the peened surface is newlineincreased up 24% in single pass treatment and up to 26% in double pass newlinetreatment over the unpeened sample The compressive residual stresses were compared over the base sample and no significant changes were observed in newlinethe water jet peened surface. Surface hardening takes place over the surface of newlinethe peened surface which is shown in the XRD profile. Process optimization is newlinecarried out by grey relational analysis and an optimal solution is suggested.