Effect of the anisotropy of martensitic transformation on ferrite deformation in Dual-Phase steels

Vibhor Atreya*, Jan Steven Van Dokkum, C. Bos, Maria J. Santofimia

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
21 Downloads (Pure)

Abstract

The volume increase and shape change during austenite to martensite transformation in dual-phase (DP) steels are largely accommodated in the microstructure by the deformation of the surrounding ferrite matrix. Accurate estimation of transformation-induced deformation of ferrite via experiments and modeling is essential for predicting the subsequent mechanical behavior of DP steels. This study aims to illustrate the disadvantages of simplifying the anisotropic transformation deformation of martensite to isotropic dilatation for modeling the transformation-induced deformation of ferrite. A novel methodology is developed comprising sequential experimental and numerical research on DP steels to quantify transformation-induced strains in ferrite. This methodology combines the results of prior austenite grain reconstruction, phenomenological theory of martensite crystallography and electron backscatter diffraction (EBSD) orientation data to estimate variant-specific transformation deformation. Subsequently, by comparison of full-field micromechanical calculation results on a virtual DP steel microstructure with experimental EBSD kernel average misorientation and geometrically necessary dislocation measurement results it is shown that neglecting the shear deformation associated with the martensitic transformation leads to significant underestimation in the prediction of transformation-induced strains in ferrite.

Original languageEnglish
Article number110805
Number of pages11
JournalMaterials and Design
Volume219
DOIs
Publication statusPublished - 2022

Keywords

  • Dual-phase steel
  • Electron backscatter diffraction
  • Martensite variants
  • Martensitic transformation
  • Micromechanical modeling
  • Plastic deformation

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