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A Study of Fatigue Crack Growth Behavior of HAYNES® 242™ Alloy PUBLIC ACCESS

[+] Author Affiliations
Laxminarayana Garimella, Peter K. Liaw

The University of Tennessee, Knoxville, TN

George Y. Lai, Dwaine L. Klarstrom

Haynes International Incorporated, Kokomo, IN

Paper No. 97-GT-374, pp. V004T12A014; 9 pages
doi:10.1115/97-GT-374
From:
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7871-2
  • Copyright © 1997 by ASME

abstract

A study of the variation in fatigue crack propagation behavior with respect to specimen orientation, aging and loading was done for HAYNES® 242™ Alloy. Fatigue crack growth tests were conducted at 650°C in vacuum. Heat treatment of the material resulted in enhanced fatigue crack growth properties. The influence of orientation on the fatigue crack growth properties was found to be minimal, although in some cases, where the notch was oriented perpendicular to the rolling direction, marginal improvement is observed. R-ratio was found to affect the fatigue crack growth behavior significantly. Fatigue crack growth rates increased when the R-ratio was changed from 0 to 0.5 and then decreased when it was further increased to 0.8. Fracture surfaces were characterized by scanning electron microscopy to explain the crack growth behavior. These results have been studied in light of the crack growth characteristics to obtain an understanding of the material behavior when subjected to fatigue loading.

Copyright © 1997 by ASME
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