The tensile deformation of a martensitic dual-phase steel

R. L. Reuben, T. N. Baker

Research output: Contribution to journalArticle

Abstract

A single 0.12 wt.% C alloy has been heat treated to produce dual-phase ferrite-martensite composites of a variety of volume fractions and grain sizes of both phases. Two separate models have been used to describe the 0.2% proof stress of these composites, one based on the topological model of Gurland and the other based on the yield propagation model of Petch. Using the topological model, the 0.2% proof stress in all dual-phase steels could be represented by σ0.2% (MPa) = 280 + 17.4dI- 1 2 (1 - g′) + 576g′ where g′ is a parameter related to the volume fractions and contiguities of the two phases and dI is the size of type I grains. This model had some inconsistencies and in particular did not show good extrapolations to either 100% martensite or 100% ferrite. Using the yield propagation model, the 0.2% proof stress could be written as σ0.2% (MPa) = 122 + {16.4 + 432 (VIIdII) 1 2}dc- 1 2 where dc is an average between the ferrite grain size and the martensite islet size, dII is the size of type II grains and VII is the volume fraction of the secondary phase. This equation showed excellent extrapolation to 100% ferrite but some change in slope was observed towards 75% martensite. The reasons for the inadequacies of representation have been attributed mainly to autotempering in the martensite and to the shortcomings in the measurement of the ferrite and martensite continuities.

Original languageEnglish
Pages (from-to)229-238
Number of pages10
JournalMaterials Science and Engineering
Volume63
Issue number2
DOIs
Publication statusPublished - 1984

ASJC Scopus subject areas

  • Engineering(all)

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