Erosion of Titanium and Aluminium Alloys Using Pulsating Water Jet: Effect of Standoff Distance

摘要

The disintegration of the material by PWJ technology depends upon many technological parameters of the equipment and particular material properties. This paper deals with the erosive effects of PWJ on the polished surfaces of metallic materials such as titanium (Ti6Al4V) and aluminium (ENAW1050AH24) alloy. The evaluation and comparison of the extent of disintegration are done on the basis of the erosion depth achieved. The nozzle movement over the material followed an ascending equidistant trajectory from z = 15 to 41 mm with a vertical step height of 2 mm. PWJ transitions over the material were performed with a sonotrode frequency f = 20.19 kHz, liquid pressure p = 40 MPa and a feed rate v = 0.25 mm.s~(-1). The depth value of the grooves formed was then measured using a MicroProf FRT contactless measuring device and evaluated in the SPIP 6.7.8 software. For aluminium sample, the deepest average depth value is h = 1583.2 μm (z = 29 mm), while the titanium material has eroded to a much smaller depth, h = 283.2 μm (z = 31 mm). By comparing the achieved hydrodynamic effects of PWJ on titanium and aluminium, significant differences in the depth of erosion and its course can be observed due to the different mechanical properties of the materials.