On strain partitioning and micro-damage behavior of dual-phase steels

A. Fillafer, C. Krempaszky, E. Werner

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

This work presents a model used to study strain partitioning and micro-damage initiation of various dual-phase steel microstructures. The model is formulated via continuum micro-mechanics and is solved in a finite-element framework. A phenomenological failure criterion is employed, calibrated and used to identify micro-damage initiation during plastic deformation.What is shown is how the primary microstructural parameters responsible for microstructural stress/strain fluctuations, namely phase strength contrast and hard phase fraction, influence phase averaged strains and phase specific strain distributions. Results of a study on micro-damage initiation show the influence of these primary microstructural parameters on strain for micro-damage initiation, the associated macro stress, and strain hardening.It is concluded that with rising microstructural mechanical heterogeneity, strain for micro-damage initiation decreases and strain hardening increases. Macroscopic stress at micro-damage initiation is shown to be primarily governed by the hard phase fraction and secondarily by the phase strength contrast.

Original languageEnglish
Pages (from-to)180-192
Number of pages13
JournalMaterials Science and Engineering A
Volume614
DOIs
StatePublished - 22 Sep 2014

Keywords

  • Failure
  • Finite-element method
  • Interfaces
  • Micromechanics
  • Plasticity
  • Steel

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