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Understanding the Influence of Neighbours on the Spheroidization of Finite 3-Dimensional Rods in a Lamellar Arrangement: Insights from Phase-Field Simulations

  • Tobias Mittnacht
  • P. G. Kubendran Amos
  • Daniel Schneider
  • Britta Nestler
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

Understanding the microstructural phenomena during the production chain of steels is essential to improve the characteristic material properties. Besides experimental investigations, numerical methods have proven to be a powerful tool to yield property delineations. Therefore, a phase-field model incorporating free energies from CALPHAD database is employed to analyse curvature-driven shape-instabilities, in the absence of any phase transformations. Owing to the instabilities, morphological evolution occurs. In this study, previous works [1, 2] are extended to capture the influence of the neighbouring rods on the volume-diffusion governed transformation of finite 3-dimensional facetted rods. It is identified that the terminal rods strongly influence the carbon redistribution. Furthermore, we observe, in the later stages of transformation, that the neighbouring rods introduce a reverse mass transfer towards the terminal rods. The interplay of those two aforementioned effects causes a shift of the critical aspect ratio (\(w/t_p\)) of the rods, above which the spheroidization is accompanied by the breaking-up of rods (‘ovulation’).

Keywords

Phase-field modelling Spheroidization Shape-instabilities 3-dimensional rods Lamellar arrangement 

Notes

Acknowledgements

The authors thank the German Research Foundation (DFG) for funding our investigations through the project with number AN 1245/1. This work was performed on the computational resource ForHLR II funded by the Ministry of Science, Research and the Arts Baden-Wuerttemberg and DFG. Authors acknowledge the primary guidance of Prof. Kumar Ankit, Dr. Avisor Bhattacharya and Dr. Fei Wang.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Tobias Mittnacht
    • 1
  • P. G. Kubendran Amos
    • 1
  • Daniel Schneider
    • 1
    • 2
  • Britta Nestler
    • 1
    • 2
  1. 1.Institute of Applied Materials (IAM-CMS), Karlsruhe Institute of Technology (KIT)KarlsruheGermany
  2. 2.Institute of Digital Materials Science (IDM)Karlsruhe University of Applied SciencesKarlsruheGermany

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