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RESEARCH PAPERS

Thermomechanical Fatigue Behavior of a Directionally Solidified Ni-Base Superalloy

[+] Author and Article Information
M. M. Shenoy, A. P. Gordon, D. L. McDowell

The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405rick.neu@me.gatech.edu

R. W. Neu1

The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405rick.neu@me.gatech.edu

1

Author to whom correspondence should be addressed.

J. Eng. Mater. Technol 127(3), 325-336 (Feb 02, 2005) (12 pages) doi:10.1115/1.1924560 History: Received October 05, 2004; Revised February 02, 2005

A continuum crystal plasticity model is used to simulate the material behavior of a directionally solidified Ni-base superalloy, DS GTD-111, in the longitudinal and transverse orientations. Isothermal uniaxial fatigue tests with hold times and creep tests are conducted at temperatures ranging from room temperature (RT) to 1038°C to characterize the deformation response. The constitutive model is implemented as a User MATerial subroutine (UMAT) in ABAQUS (2003, Hibbitt, Karlsson, and Sorensen, Inc., Providence, RI, v6.3) and a parameter estimation scheme is developed to obtain the material constants. Both in-phase and out-of-phase thermo-mechanical fatigue tests are conducted. A physically based model is developed for correlating crack initiation life based on the experimental life data and predictions are made using the crack initiation model.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Elastoplastic decomposition of the deformation gradient (11-12)

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Figure 3

Stress-strain response: experimental data and correlated simulations at 427°C (longitudinal, CC, first cycle)

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Figure 4

Stress-strain response: experimental data and correlated simulations at 760°C (longitudinal, CC, first cycle)

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Figure 5

Stress-strain response: experimental data and correlated simulations at 871°C (longitudinal, HC, first cycle)

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Figure 6

Stress-strain response: experimental data and correlated simulations at 982°C (longitudinal, CC, first cycle)

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Figure 7

Stress-strain response: experimental data and correlated simulations at 982°C (transverse, CC, first cycle)

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Figure 8

Stress-strain response: experimental data and correlated simulations at 1038°C (transverse, CC, first cycle)

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Figure 9

Primary and secondary creep responses: experimental data and correlated simulations at 871°C (longitudinal)

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Figure 10

Stress-strain response: comparison of experimental data with model predictions for in-phase (IP) TMF 538°C–1038°C in the longitudinal orientation (first cycle)

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Figure 11

Stress-strain response: comparison of experimental data with model predictions for out-of-phase (OP) TMF 538°C–927C in the longitudinal orientation

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Figure 12

Stress-strain response: comparison of experimental data with model predictions for out-of-phase (OP) TMF 538°C–927°C in the transverse orientation

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Figure 13

Initial stress-mechanical strain responses of TMF cycled (a) longitudinal and (b) transverse specimens. (c) Inelastic strain versus fatigue crack initiation lives for TMF and LCF experiments at 871°C

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Figure 14

(a) Crack initiation at a subsurface carbide and (b) crack initiation at the surface due to an oxide spike

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Figure 15

Predicted trends and selected experimental results for (a) isothermal LCF and (b) TMF of longitudinal DS GTD111 under CC

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Figure 1

Two-phase microstructure of DS GTD-111 superalloy (2)

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