Influence of martensite mechanical properties on failure mode and ductility of dual-phase steels

K. S. Choi, W. N. Liu, X. Sun, M. A. Khaleel

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

The effects of the mechanical properties of the martensite phase on the failure mode and ductility of dual-phase (DP) steels are investigated using a micromechanics-based finite element method. Actual microstructures of DP steels obtained from scanning electron microscopy (SEM) are used as representative volume elements (RVEs) in the finite element calculations. Ductile failure of the RVE is predicted as plastic strain localization during the deformation process. Systematic computations are conducted on the RVE to quantitatively evaluate the influence of the martensite mechanical properties and volume fraction on the macroscopic mechanical properties of DP steels. These properties include the ultimate tensile strength (UTS), ultimate ductility, and failure modes. The computational results show that, as the strength and volume fraction of the martensite phase increase, the UTS of DP steels increases, but the UTS strain and failure strain decrease. In addition, shear-dominant failure modes usually develop for DP steels with lower martensite strengths, whereas split failure modes typically develop for DP steels with higher martensite strengths. The methodology and data presented in this article can be used to tailor DP steel design for its intended purposes and desired properties.

Original languageEnglish
Pages (from-to)796-809
Number of pages14
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume40
Issue number4
DOIs
Publication statusPublished - 12 Feb 2009
Externally publishedYes

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Steel
failure modes
martensite
ductility
Martensite
Failure modes
Ductility
steels
mechanical properties
Mechanical properties
tensile strength
Tensile strength
Volume fraction
micromechanics
Micromechanics
Plastic deformation
finite element method
plastics
methodology
shear

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Mechanics of Materials

Cite this

Influence of martensite mechanical properties on failure mode and ductility of dual-phase steels. / Choi, K. S.; Liu, W. N.; Sun, X.; Khaleel, M. A.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 40, No. 4, 12.02.2009, p. 796-809.

Research output: Contribution to journalArticle

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