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Lecture

Application of the GEB model to predict bainite stasis, the bay formation and aspects of the bainite morphology.

Tuesday (27.09.2016)
17:45 - 18:00
Part of:


The recent Gibbs Energy Balance model, which compares the available chemical driving force to the dissipative energy for moving a solute enrichable interface, yields a very accurate description of the bainitic statis over a relatively wide temperature and composition domain for  ternary iron-based alloys and was shown to outperform existing diffusionless models. Furthermore, we have shown that the GEB model is a generic model for the austenite decomposition and also applies to ferrite formaation.

We have now extended the GEB model to demonstrate the origin of the bay formation in isothermal transformation for Fe-C-Mo alloys and to explain its absence in Fe-C-Mn alloys. 

Furthermore, without having to change the value of the solute binding energy, the GEB model also predicts surprisingly well the conditions for which the allotriomorphic ferrite formation is replaced by bainitic ferrite formation, as well as the conditions separating the fromation of upper and bainite formation for ternary Fe-C-Mn alloys. In the latter extension of the model we have to incorporate some of the aspects of the diffusionless transformation to account for the C supersaturation in bainitic ferrite.

 

Speaker:
Prof. Dr. Sybrand van der Zwaag
Delft University of Technology
Additional Authors:
  • H. Chen
    Delft University of Technology