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Elevated-Temperature Creep-Fatigue Crack-Growth Behavior of HAYNES®188 Superalloy

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Abstract:

The creep-fatigue crack-growth behavior of HAYNES® 188, a cobalt-based superalloy, was studied at the temperatures of 649, 816, and 927 oC under isothermal conditions. Various hold times at the maximum load were introduced to study the effects of hold time and temperature on the crack-growth behavior. The experiments were conducted under constant stress-intensity-factorrange control modes. Crack lengths were measured by a direct current potential method. The introduction of hold times led to an increase in the cyclic crack-growth rate. As the temperature increases, the time-dependent crack-growth behavior was dominant.

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Periodical:

Key Engineering Materials (Volumes 345-346)

Pages:

287-290

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.345-346.287

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Cite this paper

Online since:

August 2007

Authors:

S.Y. Lee, Y.L. Lu, Peter K. Liaw, Hahn Choo, Scott A. Thompson, James W. Blust, Paul F. Browning, Arun K. Bhattacharya, Jose M. Aurrecoechea, Dwaine L. Klarstrom

Keywords:

Cobalt-Based Superalloy, Creep Fatigue, Hold Time

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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