A constitutive model for transformation plasticity accompanying strain-induced martensitic transformations in metastable austenitic steels

R. G. Stringfellow*, D. M. Parks, G. B. Olson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

424 Scopus citations

Abstract

We propose a constitutive model which describes the transformation plasticity accompanying strain-induced martensitic transformation in nonthermoelastic alloys. The model consists of two parts: a transformation kinetics law describing the evolution of the volume fraction of martensite and a constitutive law defining the flow strength of the evolving two-phase composite. The Olson-Cohen model for martensite volume fraction evolution is recast in a generalized rate form so that the extent of martensite nucleation is not only a function of plastic strain and temperature, but also of the stress state. A selfconsistent method is then used for predicting the resultant stress-strain behavior. The model describes both the hardening influence of the transformation product, and the softening influence of the transformation itself, as represented by a spontaneous transformation strain. The model is then implemented in a finite element program suitable for analysis of boundary value problems. Model predictions are compared with existing experimental data for austenitic steels. We present results from a few simple analyses, including tensile necking, illustrating the critical importance of stress state sensitivity in the evolution model.

Original languageEnglish (US)
Pages (from-to)1703-1716
Number of pages14
JournalActa Metallurgica Et Materialia
Volume40
Issue number7
DOIs
StatePublished - Jul 1992

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint

Dive into the research topics of 'A constitutive model for transformation plasticity accompanying strain-induced martensitic transformations in metastable austenitic steels'. Together they form a unique fingerprint.

Cite this