Slurry Erosion–Corrosion Characteristics of As-Built Ti-6Al-4V Manufactured by Selective Laser Melting

Abstract

Erosion and erosion–corrosion tests of as-built Ti-6Al-4V manufactured by Selective Laser Melting were investigated using slurries composed of SiO2 sand particles and either tap water (pure water) or 3.5% NaCl solution (artificial seawater). The microhardness value of selective laser melting (SLM)ed Ti-6Al-4V alloy increased as the impact angle increased. The synergistic effect of corrosion and erosion in seawater is always higher than erosion in pure water at all impact angles. The seawater environment caused the dissolution of vanadium oxide V2O5 on the surface of SLMed Ti-6Al-4V alloy due to the presence of Cl− ions in the seawater. These findings show lower microhardness values and high mass losses under the erosion–corrosion test compared to those under the erosion test at all impact angles.

Insights to improve the tribo-performance of materials used under slurry erosion applications: A review

“…In both the tests, microhardness was found to be increasing on the increase of impact angle. 37 Aluminium alloys. AAs have a very wide range of slurry flow applications.…”

“…Many authors have considered the CFs of eroding particles in their investigations. 12,19,22,23,[33][34][35]37,38,40,[42][43][44][45][46][47][48][49][50][51][52][53][54][55] Similarly, some of them have considered the aspect ratio as the shape factor. [33][34][35]37,38,42,44,50,51,55 Slurry erosive wear depends upon the hardness of the targeted component material and the erodent particles.…”

“…12,19,22,23,[33][34][35]37,38,40,[42][43][44][45][46][47][48][49][50][51][52][53][54][55] Similarly, some of them have considered the aspect ratio as the shape factor. [33][34][35]37,38,42,44,50,51,55 Slurry erosive wear depends upon the hardness of the targeted component material and the erodent particles. [6][7][8] It is also dependent upon the degree and measure of deformity in erodents and target materials.…”

“…5,7,8,23,36 Since the amount of particles interacting with targeted material varies from one angle to other, many authors in their investigations ensured the same number of impacting erodent particles by keeping the different test timings of exposure at different impact angles to attain the accurate influence of impact angle, thus avoiding the misleading results. 31,34,37–39 Similarly, for keeping the kinetic energy or the number of eroding particles constant, slurry parameters; solid concentration, velocity and test duration corresponding to the initial distinct values of one type of eroding solid particles were pre-decided for others after assuming their shapes, spherical. 32,40,41 Shapes of eroding particles play the influencing role on erosion mechanism (refer Figure 1).…”

“…Many authors have considered the CFs of eroding particles in their investigations. 12,19,22,23,33–35,37,38,40,42–55 Similarly, some of them have considered the aspect ratio as the shape factor. 33–35,37,38,42,44,50,51,55…”