MARTENSITIC TRANSFORMATION AS A DEFORMATION PROCESS.

G. B. Olson*, Morris Cohen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

27 Scopus citations

Abstract

Constitutive relations for transformation plasticity have been derived from martensitic transformation kinetic theory, predicting flow-stress as a function of strain, strain-rate, temperature, and stress state. The stress-strain curve can exhibit upward curvature under the combined influence of the softening contribution of the transformation as a deformation mechanism and the hardening contribution of the transformation product. This shape provides a maximum stability of plastic flow and quantitatively accounts for observed enhancement of uniform ductility in TRIP steels. In combination with transformation dilatation effects, the flow stabilizing influence also accounts for a major transformation toughening effect observed when ductile fracture is controlled by plastic shear instability. The principles have now been applied to both homogeneous and dispersed-phase alloy systems.

Original languageEnglish (US)
Title of host publicationUnknown Host Publication Title
PublisherMetallurgical Soc of AIME
Pages367-390
Number of pages24
ISBN (Print)0373390121
StatePublished - Dec 1 1986

ASJC Scopus subject areas

  • Engineering(all)

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