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Effect Of Shot Peening On Fatigue Performance Of Two Titanium Alloys

  • H. Baea(Author)
    ,
  • B. Flinna(Author)
    ,
  • M. Ramulua(Author)
    ,
  • Gary R. Weberb(Author)
    ,
  • H. Diepb(Author)
  • aUniversity of Washington
    ,
  • bThe Boeing Company
Research Output: Contribution to conference Paper

Open access

Abstract

The aerospace industry has taken interest in Ti 5Al-5Mo-5V-3Cr (Ti5553) for use in fatigue critical applications. To more fully understand the underlying fatigue mechanisms, Ti5553 was compared to the baseline alloy Ti 6Al-4V (Ti64) under cyclic loading conditions. This paper addresses the performance of as-machined and as-peened smooth round fatigue specimens of both alloys, including fatigue data, surface roughness, fractography and metallography. Surface topography of as machined samples showed higher roughness values for Ti-5553 than Ti64, and the Ti5553 exhibited higher S-N plot scatter than Ti64. However, consistent fatigue behavior was demonstrated for the as-peened specimens. Fracture surfaces indicated standard fatigue and ductile failure modes. Shot peening process increased fatigue life of Ti5553 and Ti64 with increasing surface hardening and surface roughness.

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