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Viscoplastic-plastic modelling of IN792
Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics . Linköping University, The Institute of Technology.
Demag Delaval Indust. Turbomach. AB, Finspång.
Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics .
Linköping University, Department of Management and Engineering, Solid Mechanics . Linköping University, The Institute of Technology.
2004 (English)In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 29, no 4, 437-445 p.Article in journal (Refereed) Published
Abstract [en]

At high temperatures metallic materials behave in a viscous manner exemplified by strain rate dependence, stress relaxation and creep deformation. At low temperatures however, these effects are extremely small, and the behaviour is strain rate independent and shows no or very small relaxation effects. Finally there exists an intermediate region, in which the material behaviour is close to strain rate independent for high strain rates but at the same time shows time dependent inelastic effects, such as stress relaxation and creep. For IN792 this occurs at temperatures around 650 °C. The article describes the extension of a power-law viscoplastic model describing the behaviour of IN792 at 850 °C, also to describe the behaviour at 650 °C, by bounding the elastic-viscoplastic stress-space by a plastic yield surface. The model parameters have been estimated using data from creep test and tailored step relaxation tests, and the model fits well to both the step relaxation data aimed at resembling relevant component conditions and long term creep data. © 2003 Published by Elsevier B.V.

Place, publisher, year, edition, pages
2004. Vol. 29, no 4, 437-445 p.
Keyword [en]
Constitutive equations, Nickel superalloy, Plasticity, Viscoplasticity
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-45782DOI: 10.1016/j.commatsci.2003.12.002OAI: oai:DiVA.org:liu-45782DiVA: diva2:266678
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Almroth, PerSimonsson, KjellSjöström, Sören

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