TAILORING SURFACE MORPHOLOGY AND TOPOGRAPHY OF SHOT-PEENED Ti6Al4V VIA GRIT BLASTING


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YILDIRAN AVCU Y. , Yetik O., Guney M., SINMAZÇELİK T. , AVCU E.

MATERIALI IN TEHNOLOGIJE, vol.55, no.5, pp.625-628, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 55 Issue: 5
  • Publication Date: 2021
  • Doi Number: 10.17222/mit.2021.032
  • Title of Journal : MATERIALI IN TEHNOLOGIJE
  • Page Numbers: pp.625-628
  • Keywords: erosive wear, shot peening, surface engineering, titanium alloy, FATIGUE, TI-6AL-4V, BEHAVIOR

Abstract

The present study aims to reveal the effectiveness of grit blasting when modifying the surface properties of a Ti6Al4V alloy deteriorated due to shot peening. Ti6Al4V samples shot-peened under different parameters were grit-blasted (at impingement angles of 30 degrees and 90 degrees, blasting pressures of 1.5 bar and 3 bar). Grit blasting proved to be an effective way of tailoring the surface topography as the surface roughness of shot-peened samples (approx. 10 mu m) declined to approx. 2 mu m. The surface modifications mainly occurred via micro-ploughing and micro-cutting wear mechanisms, indicating that grit blasting at 30 degrees was more favourable than at 90 degrees for modifying the deteriorated surface properties after shot peening. Shot-peened samples behaved similarly to mirror-polished unpeened samples during grit blasting, showing that the modified surface and subsurface properties obtained via shot peening have an insignificant effect on grit blasting of the alloy. A quantitative analysis of the area covering the embedded particles on the surface of the alloy due to grit blasting showed that the area almost doubled when the alloy was grit blasted at 90 degrees compared to 30 degrees, highlighting an excessive amount of embedding, which would be critical when surface decontamination is important.