The predictive capability of the Sehitoglu–Boismier unified constitutive and life model for Mar-M247 Ni-base superalloy is extended from a maximum temperature of 871 °C to 1038 °C. The unified constitutive model suitable for thermomechanical loading is adapted and calibrated using the response from isothermal cyclic experiments conducted at temperatures from 500 °C to 1038 °C at different strain rates with and without dwells. The flow rule function and parameters as well as the temperature dependence of the evolution equation for kinematic hardening are established. Creep and stress relaxation are critical to capture in this elevated temperature regime. The coarse-grained polycrystalline microstructure exhibits a high variability in the predicted cyclic response due to the variation in the elastic response associated with the orientation of the crystallographic grains. The life model accounts for fatigue, creep, and environmental damage under both isothermal and thermomechanical fatigue (TMF).
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July 2015
Research-Article
Thermomechanical Fatigue of Mar-M247: Extension of a Unified Constitutive and Life Model to Higher Temperatures
K. A. Brindley,
K. A. Brindley
The George W. Woodruff School of
Mechanical Engineering,
Mechanical Engineering,
Georgia Institute of Technology
,Atlanta, GA 30332
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M. M. Kirka,
M. M. Kirka
The George W. Woodruff School of
Mechanical Engineering,
Mechanical Engineering,
Georgia Institute of Technology
,Atlanta, GA 30332
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P. Fernandez-Zelaia,
P. Fernandez-Zelaia
The George W. Woodruff School of
Mechanical Engineering,
Mechanical Engineering,
Georgia Institute of Technology
,Atlanta, GA 30332
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R. W. Neu
R. W. Neu
The George W. Woodruff School of
Mechanical Engineering;
Mechanical Engineering;
School of Materials Science and Engineering,
e-mail: rick.neu@gatech.edu
Georgia Institute of Technology
,Atlanta, GA 30332
e-mail: rick.neu@gatech.edu
Search for other works by this author on:
K. A. Brindley
The George W. Woodruff School of
Mechanical Engineering,
Mechanical Engineering,
Georgia Institute of Technology
,Atlanta, GA 30332
M. M. Kirka
The George W. Woodruff School of
Mechanical Engineering,
Mechanical Engineering,
Georgia Institute of Technology
,Atlanta, GA 30332
P. Fernandez-Zelaia
The George W. Woodruff School of
Mechanical Engineering,
Mechanical Engineering,
Georgia Institute of Technology
,Atlanta, GA 30332
R. W. Neu
The George W. Woodruff School of
Mechanical Engineering;
Mechanical Engineering;
School of Materials Science and Engineering,
e-mail: rick.neu@gatech.edu
Georgia Institute of Technology
,Atlanta, GA 30332
e-mail: rick.neu@gatech.edu
Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received January 29, 2014; final manuscript received February 19, 2015; published online March 11, 2015. Assoc. Editor: Said Ahzi.
J. Eng. Mater. Technol. Jul 2015, 137(3): 031001 (14 pages)
Published Online: July 1, 2015
Article history
Received:
January 29, 2014
Revision Received:
February 19, 2015
Online:
March 11, 2015
Citation
Brindley, K. A., Kirka, M. M., Fernandez-Zelaia, P., and Neu, R. W. (July 1, 2015). "Thermomechanical Fatigue of Mar-M247: Extension of a Unified Constitutive and Life Model to Higher Temperatures." ASME. J. Eng. Mater. Technol. July 2015; 137(3): 031001. https://doi.org/10.1115/1.4029908
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