Modeling of the high temperature behaviour of IN792 in gas turbine hot parts

The material parameters for two isothermal viscoplastic models with deliberately limited sets of material parameters have been estimated. The models are to describe the behaviour of the nickel based superalloy IN792 in a gas turbine hot part application. The models are based on a power law flow equa...

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Bibliographic Details
Published in:Computational materials science 2002-11, Vol.25 (3), p.305-315
Main Authors: Almroth, P., Hasselqvist, M., Sjöström, S., Simonsson, K.
Format: Article
Language:English
Subjects:
Applied sciences
Constitutive equations
Creep
Elasticity. Plasticity
Exact sciences and technology
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Nickel superalloy
TECHNOLOGY
TEKNIKVETENSKAP
Viscoplasticity
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Summary:The material parameters for two isothermal viscoplastic models with deliberately limited sets of material parameters have been estimated. The models are to describe the behaviour of the nickel based superalloy IN792 in a gas turbine hot part application. The models are based on a power law flow equation and the state variable used is backstress. The model calibration is done by least-squares optimization using non-standard constitutive tests that are aimed at describing relevant component conditions. The constitutive tests give information about the kinematic hardening effects for the backstress evolution equations, while secondary creep data provides stress versus inelastic strain rate information for the flow equation. All tests are uniaxial and isothermal. With the estimated parameter sets the models give relatively good fits to the data. The results suggest that the models can be used to describe the high temperature behaviour of IN792.
ISSN:0927-0256
1879-0801
1879-0801
DOI:10.1016/S0927-0256(02)00219-7