Constitutive modeling for predicting peak stress characteristics during hot deformation of hot isostatically processed nickel-base superalloy

Hot flow behavior of hot isostatically processed experimental nickel-based superalloy is investigated over temperature and strain rate ranging from 1000–1200 °C and 0.001–1 s⁻¹, respectively by carrying out constant true strain rate isothermal compression tests up to true strain of 0.69. True stress...

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Bibliographic Details
Published in:Journal of materials science 2015-10, Vol.50 (19), p.6444-6456
Main Authors: Satheesh Kumar, S. S, Raghu, T, Bhattacharjee, Pinaki P, Appa Rao, G, Borah, Utpal
Format: Article
Language:English
Subjects:
Alloys
Analysis
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Compression tests
Constitutive models
Crystallography and Scattering Methods
Deformation
Dependence
equations
Heat treating
Materials Science
Mathematical models
Morphology
Nickel
Nickel base alloys
Nickel products
Original Paper
Polymer Sciences
prediction
Solid Mechanics
Strain analysis
Strain hardening
Strain rate
Superalloys
temperature
True strain
True stress
Yield strength
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Summary:Hot flow behavior of hot isostatically processed experimental nickel-based superalloy is investigated over temperature and strain rate ranging from 1000–1200 °C and 0.001–1 s⁻¹, respectively by carrying out constant true strain rate isothermal compression tests up to true strain of 0.69. True stress–true strain curves corrected for adiabatic temperature rise exhibited rapid strain hardening followed by flow softening behavior irrespective of temperature and strain rate regimes investigated, although anomalous flow behavior is observed at 1200 °C. Variation of peak flow stress with temperature is corroborated to the microstructural changes pertaining to the morphology and relative volume fraction of the phases present. From the experimental results, constitutive model incorporating the effects of strain rate, strain, and temperature is established to describe the hot flow behavior of investigated alloy. Dependence of peak flow stress on strain rate and temperature described by Zener–Hollomon (Z) parameter indicated increase in peak flow stress with Z. Additionally Cingara-Queen equation is employed to predict flow curve up to peak stress. The reliability of developed constitutive models is validated statistically and the results indicate reasonable agreement with experimental findings.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-015-9200-0