A continuum model for the effect of dynamic recrystallization on the stress-strain response

H. Kooiker* (Corresponding Author), E. S. Perdahcioğlu, A. H. van den Boogaard

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    2 Citations (Scopus)
    47 Downloads (Pure)

    Abstract

    Austenitic Stainless Steels and High-Strength Low-Alloy (HSLA) steels show significant dynamic recovery and dynamic recrystallization (DRX) during hot forming. In order to design optimal and safe hot-formed products, a good understanding and constitutive description of the material behavior is vital. A new continuum model is presented and validated on a wide range of deformation conditions including high strain rate deformation. The model is presented in rate form to allow for the prediction of material behavior in transient process conditions. The proposed model is capable of accurately describing the stress-strain behavior of AISI 316LN in hot forming conditions, also the high strain rate DRX-induced softening observed during hot torsion of HSLA is accurately predicted. It is shown that the increase in recrystallization rate at high strain rates observed in experiments can be captured by including the elastic energy due to the dynamic stress in the driving pressure for recrystallization. Furthermore, the predicted resulting grain sizes follow the power-law dependence with steady state stress that is often reported in literature and the evolution during hot deformation shows the expected trend.

    Original languageEnglish
    Article number867
    JournalMaterials
    Volume11
    Issue number5
    DOIs
    Publication statusPublished - 22 May 2018

    Keywords

    • Austenitic stainless steel
    • Continuum modeling
    • Driving pressure
    • Dynamic recrystallization
    • Dynamic stress
    • High-strength low-alloy
    • Hot forming
    • Strain rate

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