Strengthening via the formation of strain-induced martensite in stainless steels

K. Spencer, J. D. Embury, K. T. Conlon, M. Véron, Y. Bréchet

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201 Citations (Scopus)

Abstract

The strengthening that results from the low-temperature formation of strain-induced martensite in austenitic stainless steel was studied. Specifically, the work hardening behaviour was characterized, as well as the spatial distribution of the martensite as a function of prior strain. Neutron diffraction measurements revealed the degree of elastic strain partitioning between the austenite and martensite. It was found that a sufficiently high initial dislocation density leads to a localization of the martensite transformation in the form of a Lüders front. The martensite acts as an elastic reinforcing phase as it supports a higher stress than the austenite tensile loading, even though the martensite co-deforms plastically with the austenite. A model was developed that predicts the volume fraction of martensite formed as a function of plastic strain.

Original languageEnglish
Pages (from-to)873-881
Number of pages9
JournalMaterials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume387-389
Issue number1-2 SPEC. ISS.
DOIs
Publication statusPublished - 15 Dec 2004
Externally publishedYes

Keywords

  • Austenitic stainless steel
  • Co-deformation
  • Diffraction
  • Martensite
  • TRIP

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