Effect of surface treatment on the fatigue strength of additive manufactured Ti6Al4V alloy
Author: Carlos Navarroa, Jesús Vázqueza, Jaime Domíngueza, Antonio Periñánb, Marta Herrera Garcíab, Fernando Lasagnib, Simon Bernardingc, Sebastian Slawikc, Frank Mücklichc, Francisco Bobyd, Lloyd Hackeld , aUniversity of Seville, Spain bAdvanced Center for Aeros
Source: ICSP14 Milan
Doc ID: 2022081
Year of Publication: 2022
Abstract:
Abstract
Different alloys can be used for Additive Manufacturing (AM) with good structural strength. Among the
titanium alloys, Ti6Al4V is the most used, especially for aerospace applications. There have been many
analyses of the mechanical properties of additive manufactured Ti-6Al-4V with very good static strength
results in general. However, there are still some difficulties to get fatigue properties close enough to the ones
of specimens manufactured using traditional processes
Considering the high effect of surface roughness on the fatigue strength of AM specimens, this work deals
with the effect produced by some surface treatments on the fatigue properties. Five treatments have been
used for comparison. All specimens were annealed previously to reduce residual stresses, as well as sand
blasted to reduce the roughness. The treatments considered are: 1) no treatment after annealing and sand
blasting; 2) shot peening; 3) shot peening plus Chemical Assisted Surface Enhancement (CASE); 4) laser
shock peening, and 5) HIP. After fatigue testing, a comparison of the results has been carried out. It was
found that laser peening produced the best results, followed by shot peening plus CASE and shot peening,
with the lowest strength produced by HIP as well as just sand blasting after thermal treatment.
Keywords: Additive manufacturing; fatigue strength of AM elements; shoot peening; laser shock peening;
superfinishing; fatigue strength improvement.
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