WIAS Preprint No. 1507, (2010)

Numerical cooling strategy design for hot rolled dual phase steel



Authors

  • Suwanpinij, Piyada
  • Togobytska, Nataliya
  • Prahl, Ulrich
  • Weiss, Wolf
  • Hömberg, Dietmar
  • Bleck, Wolfgang

2010 Mathematics Subject Classification

  • 74N15 34A55 49N45

Keywords

  • Dual phase steel, hot rolling, process simulation, phase transformation, rate law model, parameter identification, process design

Abstract

In this article, the Mo-Mn dual phase steel and its process parameters in hot rolling are discussed. The process window was derived by combining the experimental work in a hot deformation dilatometer and numerical calculation of process parameters using rate law models for ferrite and martensite transformation. The ferrite formation model is based on the Leblond and Devaux approach while martensite formation is based on the Koistinen-Marburger (K-M) formula. The carbon enrichment during ferrite formation is taken into account for the following martensite formation. After the completion of the parameter identification for the rate law model, the evolution of phases in multiphase steel can be addressed. Particularly, the simulations allow for predicting the preferable degree of retained strain and holding temperature on the run out table (ROT) for the required ferrite fraction.

Appeared in

  • Steel Res. Int., 81 (2010) pp. 1001--1009.

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