WIT Press

Effect Of Small Artificial Defects And Shot Peening On Fatigue Strength Of Ti-6AI-4V Alloys At Elevated Temperatures

Price

Free (open access)

Paper DOI

10.2495/SURF970171

Volume

17

Pages

9

Published

1997

Size

851 kb

Author(s)

Y. Kato, S. Takafuji & N. Hasegawa

Abstract

Rotary bending fatigue tests of Ti-6Al-4V alloy have been conducted in the temperature range of 20 °C to 450 °C using both unnotched and notched specimen with several small drilling holes on their surface. High tempera- ture fatigue strengths at 10' cycles are observed, and shot peening effects are discussed. 1 Introduction Mechanical surface treatments such as shot peening are known to enhance the resistance of metal alloys to fatigue. It has been established that an increment in fatigue strength can be attributed to compressive residual stresses and strain hardening in near surface regions developed by shot peening. On the other hand, a decrease in fatigue strength also results because of severe stress concentration due to a det

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