Investigation of water jet peening process parameters on AL6061-T6

Abstract

Water jet peening is the unconventional surface treatment technique which is gaining importance in advanced manufacturing processes. In contrast to conventional peening operations, water jet peening acts as a simple process control, despite the presence of multiple variables in the process. This paper describes a pure water jet employed for impingement on the target surface of aluminium 6061-T6 alloy with a pure water jet cutting nozzle. In this study, experiments were conducted with different water jet pressure by varying the standoff distance, traverse speed and number of passes. Determination of the optimal water jet peening parameters for the aluminium alloy by the multi-response technique TOPSIS was another objective. The experimental results indicated improvement in the micro hardness and surface roughness of the peened surface over the base material. The compressive residual stress was measured for optimal setting conditions. No significant changes were observed in the water peened surface.

Fatigue‐based model for the droplet impingement erosion incubation period of metallic surfaces

“…An experimental study of waterjet peening process parameters on aluminium alloy 6061-T6 was conducted by Muruganandhan et al 25 The resulting surface hardness has been measured as a function of duration and drop impact velocity. An experimental study of highpressure waterjet peened aluminium alloy 7075-T6 and its effect on fatigue life was conducted by Ramulu et al 26 Supported by publications for shot peening and cavitation peening, [27][28][29][30] the constants (a, b, p wh,th ) in Equations (11a) to (11d), for the increase in surface hardness and residual compressive stress as a function of the 'water-hammer pressure' (p wh ) were defined.…”

“…An experimental study of waterjet peening process parameters on aluminium alloy 6061‐T6 was conducted by Muruganandhan et al 25 The resulting surface hardness has been measured as a function of duration and drop impact velocity. An experimental study of high‐pressure waterjet peened aluminium alloy 7075‐T6 and its effect on fatigue life was conducted by Ramulu et al 26 …”

A critical appraisal of laser peening and its impact on hydrogen embrittlement of titanium alloys

“…LSP or LP 189 is one of the advanced peening processes for making the metal surfaces and sub-layers densify and for changing surface chemical activities. To the surprise of the engineers, in contrast to water jet peening, 190 shot peening, cold rolling, high-pressure torsion, laser work hardening, in terms of compression layer depth, mechanical properties enhancement, and high level of induced stresses stability in metal 191–198 made the LSP the most effective surface modification technique. LSP will set up a beneficial microstructural transformation in the material surface and enhances the mechanical performance of a component.…”

Mathematical Model and Verification of Residual Stress Induced by Water Jet Peening

“…Therefore, the impact pressure of the water jet acting on the target surface was assumed to be uniformly distributed [17] (i.e., the pressure at each point in the jet coverage region was equal to the water-hammer pressure) ( Figure 3). In addition, during the WJP process, the formation of the RS field was the result of the water-hammer pressure [6,19]; thus,…”