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TECHNICAL PAPERS

Use of CDM in Materials Modeling and Component Creep Life Prediction

[+] Author and Article Information
Brian Dyson

Department of Materials, Imperial College of Science, Technology and Medicine, Prince Consort Road, London SW7 2BP, England

J. Pressure Vessel Technol 122(3), 281-296 (Apr 03, 2000) (16 pages) doi:10.1115/1.556185 History: Received May 12, 1999; Revised April 03, 2000
Copyright © 2000 by ASME
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References

Figures

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Damage caused by growth of a constant density of grain boundary cavities
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Damage caused by continuous nucleation and growth of grain boundary cavities
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Damage caused by dynamic coarsening of the subgrain microstructure
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Damage caused by multiplication of the mobile dislocation density
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Damage caused by coarsening of a constant volume fraction of creep-strengthening particles
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Damage caused by matrix-solute depletion due to precipitation and growth of creep-benign particles
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Damage caused by repeated multiple fracture of a corrosion product created by attack from the external fluid environment
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Damage by intergranular gas bubbles caused by internal oxidation due to diffusion of oxygen from the external fluid environment
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Comparison of CDM model predictions of minimum creep rate as a function of stress with experimental data for the alloy In 738LC
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Computed creep curves at 150 MPa/850°C using the Table 3 parameter set (i.e., no damage) under constant load (dashed line) and constant stress (solid line)
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Computed creep curves at 150 MPa/850°C, with no damage under constant load (CL), dashed line: with damage by mobile dislocation multiplication under constant load (CL), solid line; and under constant stress (CS), dotted line
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Computed creep curves at 150 MPa/850°C under constant load, with no damage (dashed line) and with damage by particle coarsening (solid line)
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Computed creep curves at 150 MPa/850°C under constant load, with no damage (dashed line) and with cavities nucleating continuously with strain (solid line)
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Computed creep curves at 150 MPa/850°C under constant load, with no damage (dashed line) and with a constant density of cavities nucleated at t=0 (solid line)
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A re-plot of the 850°C data in Fig. 9 with additional data from the conventionally cast version of the same In738LC alloy 43
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Computed constant load creep curves at 170 MPa/850°C for In738LC using two damage parameters for d.s. and an additional one for c.c.
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Computed constant load creep curves at 250 MPa/850°C for In738LC using two damage parameters for d.s. and an additional one for c.c.
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Loops of 1 percent total strain range obtained from equation set 51 at 850°C with straining rate of 10−4 s−1 and no softening term (i.e., C=0); dotted curve is monotonic compression
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Model prediction of cyclic softening as a function of cycle number, computed using same parameters, as in Fig. 18, but with the addition of the softening coefficient, C=100
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Empirical modeling of HAZ ductility data of Cane 59
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Comparison of CDM model predictions of minimum creep rate as a function of stress with Cane’s data 59 for 214Cr1Mo simulated HAZ material
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Comparison of CDM model predictions of lifetime (solid line) as a function of stress and variable ductility with Cane’s data 59 for 214Cr1Mo simulated HAZ material; the dashed line is parent material
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Comparison of model creep curves for parent and simulated HAZ materials at 50 MPa/565°C
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Comparison of model creep curves for parent and simulated HAZ materials at 150 MPa/565°C

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