Impact of second phase morphology and orientation on the plastic behavior of dual-phase steels

Karim Ismail, Astrid Perlade, Pascal J. Jacques, Thomas Pardoen, Laurence Brassart

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

Martensite volume fraction, composition and grain size are the known primary factors controlling the mechanical behavior of ferrite-martensite dual-phase steels. Recently, excellent performances of dual-phase steels with a firous microstructure have been reported. However, the precise role of martensite morphology and orientation has not been thoroughly elucidated yet. This study develops a two-scale micromechanical modeling strategy in order to investigate the effct of particle morphology and orientation on the elastoplastic behavior of dual-phase steels. Finite element simulations are carried out on 3D periodic unit cells, each having a given orientation and volume fraction of spheroidal particles. The overall response is obtained by averaging the response of grains with diffrent orientations, thus bypassing the need for costly full-fild simulations on representative volume elements of realistic microstructures. A detailed parameter study systematically investigates the effct of particle morphology and orientation at grain level and at grain assembly level. While particle morphology and orientation effcts lead to signifiant diffrences at grain level in terms of strain hardening behavior and back-stress development, the impact of the phase morphology at the homogenized multigrain level is almost negligible up to the onset of necking. However, the mechanical filds at the micro-scale are considerably inflenced by both particle morphology and orientation, and are expected to largely impact the damage behavior through, among others, generating large grain-to-grain heterogeneities.

Original languageEnglish
Pages (from-to)130-146
Number of pages17
JournalInternational Journal of Plasticity
Volume118
DOIs
Publication statusPublished - 1 Jul 2019

Keywords

  • Dual-phase steels
  • Elastic-plastic material
  • Finite elements
  • Inhomogeneous material
  • Microstructures

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