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Thermo-mechanically coupled model of diffusionless phase transformation in austenitic steel

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Author

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.

Department/s

Publishing year

2010

Language

English

Pages

1580-1591

Publication/Series

International Journal of Solids and Structures

Volume

47

Issue

11-12

Document type

Journal article

Publisher

Elsevier

Topic

  • Mechanical Engineering

Keywords

  • Phase transformation
  • Thermo-mechanical processes
  • Finite strain plasticity
  • AIS1304
  • Forming limit diagram
  • FLD

Status

Published

ISBN/ISSN/Other

  • ISSN: 0020-7683