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A constitutive model for the formation of martensite in austenitic steels under large strain plasticity

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Author

Summary, in English

A constitutive model for diffusionless phase transitions in elastoplastic materials undergoing large deformations is developed. The model takes basic thermodynamic relations as its starting point and the phase transition is treated through an internal variable (the phase fractions) approach. The usual yield potential is used together with a transformation potential to describe the evolution of the new phase. A numerical implementation of the model is presented, along with the derivation of a consistent algorithmic tangent modulus. Simulations based on the presented model are shown to agree well with experimental findings. The proposed model provides a robust tool suitable for large-scale simulations of phase transformations in austenitic steels undergoingz extensive deformations, as is demonstrated in simulations of the necking of a bar under tensile loading and also in simulations of a cup deep-drawing process.

Department/s

Publishing year

2007

Language

English

Pages

1213-1239

Publication/Series

International Journal of Plasticity

Volume

23

Issue

7

Document type

Journal article

Publisher

Elsevier

Topic

  • Mechanical Engineering

Keywords

  • constitutive model
  • large strain plasticity
  • phase transformation

Status

Published

ISBN/ISSN/Other

  • ISSN: 0749-6419