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Effect of shot peening on fatigue performance of a lamellar titanium aluminide alloy

Authors
Journal
Acta Materialia
1359-6454
Publisher
Elsevier
Publication Date
Volume
54
Issue
4
Identifiers
DOI: 10.1016/j.actamat.2005.10.043
Keywords
  • Shot Peening
  • High Cycle Fatigue
  • Gamma Titanium Aluminides

Abstract

Abstract Shot peening is assessed as a potential method for improving the fatigue strength of titanium aluminide alloys based on γ(TiAl). Metallographic characterization was performed with regard to surface roughness, microhardness, residual stress profiles, and structural changes occurring in the subsurface region. The fatigue performance that can be achieved by shot peening mainly depends on the compressive stresses left in the surface region, but is also governed by the fine details of the microstructure. In view of the anticipated high-temperature application of TiAl alloys, particular emphasis is placed on the thermal stability of the surface hardening developed by shot peening.

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