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Fatigue-induced phase formation and its deformation behavior in a cobalt-based superalloy

Published online by Cambridge University Press:  01 March 2012

M. L. Benson ,
T. A. Saleh ,
P. K. Liaw ,
H. Choo ,
D. W. Brown ,
M. R. Daymond ,
X. -L. Wang ,
A. D. Stoica ,
R. A. Buchanan  and
D. L. Klarstrom
M. L. Benson*
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996
T. A. Saleh
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996
P. K. Liaw
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996
H. Choo
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996 and Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
D. W. Brown
Affiliation:
Los Alamos Neutron Science Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
M. R. Daymond
Affiliation:
Department of Mechanical and Materials Engineering, Queen’s University, Kingston, Ontario K7L3N6, Canada
X. -L. Wang
Affiliation:
Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
A. D. Stoica
Affiliation:
Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
R. A. Buchanan
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996
D. L. Klarstrom
Affiliation:
Haynes International, Inc., Kokomo, Indiana 46904
*
a)Electronic mail: mbenson2@utk.edu
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Abstract

The low-cycle fatigue behavior of a cobalt-based superalloy was studied in situ using neutron–diffraction experiments. The alloy exhibited stress-induced formation of a hexagonal-close-packed (hcp) phase within its parent face-centered-cubic (fcc) phase at ambient temperature under strain-controlled fatigue conditions with a total strain range, Δε=2.5%. The (101) hcp peak was first observed during the 12th fatigue cycle under the given conditions following a period during which no hcp phase was detected. Subsequently, the intensity of the hcp peaks increased as fatigue progressed. Furthermore, within a single fatigue cycle, the intensity of the (101) hcp peak decreased during the compression half-cycle and increased again when the specimen was subjected to a subsequent tensile strain. The result suggests that the fcc to hcp transformation is partially reversible within one fatigue cycle.

Type
Strain/Stress Analysis
Information
Powder Diffraction , Volume 20 , Issue 2 , June 2005 , pp. 121 - 124
Copyright
Copyright © Cambridge University Press 2005

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