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Research Papers

Relaxation of Shot-Peened Residual Stresses Under Creep Loading

[+] Author and Article Information
Dennis J. Buchanan

 University of Dayton Research Institute, Dayton, OH 45469-0020

Reji John

Materials and Manufacturing Directorate, Air Force Research Laboratory (AFRL/RXLMN), Wright-Patterson Air Force Base, OH 45433-7817

Robert A. Brockman

 University of Dayton Research Institute, Dayton, OH 45469-0110

J. Eng. Mater. Technol 131(3), 031008 (May 26, 2009) (10 pages) doi:10.1115/1.3120393 History: Received September 23, 2008; Revised January 30, 2009; Published May 26, 2009

Shot peening is a commonly used surface treatment process that imparts compressive residual stresses into the surface of metal components. Compressive residual stresses retard initiation and growth of fatigue cracks. During the component loading history, the shot-peened residual stresses may change due to thermal exposure, creep, and cyclic loading. This paper describes a methodical approach for characterizing and modeling residual stress relaxation under elevated temperature loading, near and above the monotonic yield strength of nickel-base superalloy IN100. The model incorporates the dominant creep deformation mechanism, coupling between the creep and plasticity models, and effects of prior plastic strain. The initial room temperature residual stress and plastic strain profiles provide the initial conditions for relaxation predictions using the coupled creep-plasticity model. Model predictions correlate well with experimental results on shot-peened dogbone specimens subject to single cycle and creep loading conditions at elevated temperature. The predictions accurately capture both the shape and magnitude of the retained residual stress profile.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Monotonic true stress versus true strain for IN100 tested at 23°C and 650°C

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Figure 2

Traditional creep strain and creep rate versus time curves

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Figure 3

Total strain rate versus total strain for IN100 at σmax=1000 MPa and 650°C with different levels of prestrain

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Figure 4

Total strain rate versus total strain for IN100 at σmax=900 MPa and 650°C with different levels of prestrain

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Figure 5

Total strain rate versus total strain for IN100 at σmax=800 MPa and 650°C with different levels of prestrain

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Figure 6

Total strain rate versus total strain for IN100 at σmax=800 MPa, 0% RT prestrain, and 650°C

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Figure 7

Total strain rate versus total strain for IN100 at σmax=1000 MPa, 1% RT prestrain, and 650°C

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Figure 8

Total strain rate versus total strain for IN100 at σmax=1000 MPa, 5% RT prestrain, and 650°C

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Figure 9

Composite of baseline residual stress and cold work distributions superimposed on shot-peened IN100 microstructure

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Figure 10

Schematic of dogbone specimen, uniform gauge section, and finite element geometry

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Figure 11

Effect of shot-peened residual stresses on yielding in IN100 at 900 MPa and 650°C in virgin and shot-peened samples

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Figure 12

Effect of residual stresses on strain versus time response in IN100 at 800 MPa and 900 MPa and 650°C in virgin and shot-peened samples

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Figure 13

Prediction for retained residual stresses in shot-peened dogbone specimen from single load-unload cycle in IN100 at 900 MPa and 650°C

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Figure 14

Prediction for retained residual stresses in shot-peened dogbone specimen from 30 min creep in IN100 at 900 MPa and 650°C

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Figure 15

Prediction for retained residual stresses in shot-peened dogbone specimen from 10 h creep in IN100 at 900 MPa and 650°C

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