Thermo-mechanically coupled model of diffusionless phase transformation in austenitic steel
Författare
Summary, in English
Abstract in Undetermined
A constitutive model of thermo-mechanically coupled finite strain plasticity considering martensitic phase transformation is presented. The model is formulated within a thermodynamic framework, giving a physically sound format where the thermodynamic mechanical and chemical forces that drive the phase transformation are conveniently identifiable. The phase fraction is treated through an internal variable approach and the first law of thermodynamics allows a consistent treatment of the internal heat generation due to dissipation of inelastic work. The model is calibrated against experimental data on a Ni-Cr steel of AISi304-type, allowing illustrative simulations to be performed. It becomes clear that the thermal effects considered in the present formulation have a significant impact on the material behavior. This is seen, not least, in the effects found on forming limit diagrams, also considered in the present paper.
A constitutive model of thermo-mechanically coupled finite strain plasticity considering martensitic phase transformation is presented. The model is formulated within a thermodynamic framework, giving a physically sound format where the thermodynamic mechanical and chemical forces that drive the phase transformation are conveniently identifiable. The phase fraction is treated through an internal variable approach and the first law of thermodynamics allows a consistent treatment of the internal heat generation due to dissipation of inelastic work. The model is calibrated against experimental data on a Ni-Cr steel of AISi304-type, allowing illustrative simulations to be performed. It becomes clear that the thermal effects considered in the present formulation have a significant impact on the material behavior. This is seen, not least, in the effects found on forming limit diagrams, also considered in the present paper.
Avdelning/ar
Publiceringsår
2010
Språk
Engelska
Sidor
1580-1591
Publikation/Tidskrift/Serie
International Journal of Solids and Structures
Volym
47
Issue
11-12
Fulltext
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Mechanical Engineering
Nyckelord
- Phase transformation
- Thermo-mechanical processes
- Finite strain plasticity
- AIS1304
- Forming limit diagram
- FLD
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0020-7683