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Research Papers

Characterization of the Creep Deformation and Rupture Behavior of DS GTD-111 Using the Kachanov–Rabotnov Constitutive Model

[+] Author and Article Information
Calvin M. Stewart

Department of Mechanical, Materials, and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450calvin.stewart@knights.ucf.edu

Ali P. Gordon

Department of Mechanical, Materials, and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450

Erik A. Hogan

Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309

Ashok Saxena

College of Engineering, University of Arkansas, Fayetteville, AR 72701

J. Eng. Mater. Technol 133(2), 021013 (Mar 21, 2011) (11 pages) doi:10.1115/1.4003111 History: Received June 11, 2010; Revised September 01, 2010; Published March 21, 2011; Online March 21, 2011

Creep deformation and rupture experiments are conducted on samples of the Ni-base superalloy directionally solidified GTD-111 tested at temperatures between 649°C and 982°C and two orientations (longitudinally and transversely oriented). The secondary creep constants are analytically determined from creep deformation experiments. The classical Kachanov–Rabotnov model for tertiary creep damage is implemented in a general-purpose finite element analysis (FEA) software. The simulated annealing optimization routine is utilized in conjunction with the FEA implementation to determine the creep damage constants. A comparison of FEA and creep deformation data demonstrates high accuracy. Using regression analysis, the creep constants are characterized for temperature dependence. A rupture prediction model derived from creep damage evolution is compared with rupture experiments.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Grain structure of DS GTD-111 with microstructure imposed

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Figure 2

Grain structure of GTD-111: (a) T-oriented specimen and (b) L-oriented specimen

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Figure 3

Dark areas are the bimodal γ′ precipitated particles

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Figure 4

Secondary creep constants for DS GTD-111

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Figure 5

Single element FEM geometry used with force and displacement applied

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Figure 6

USHARP optimization framework (30)

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Figure 7

Least-squares values presented for every tenth iteration during optimization

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Figure 8

Creep deformation fits of L (open) and T (filled) DS GTD-111 at temperatures of 649–982°C using the isotropic Kachanov–Rabotnov formulation

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Figure 9

Temperature dependence of the M tertiary creep damage constants for DS GTD-111

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Figure 10

Temperature dependence of the ϕ tertiary creep damage constants for DS GTD-111

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Figure 11

Stress-damage curves for (a) L and (b) T orientations at 760°C and 871°C

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Figure 12

Rupture time comparison

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