Damage and rupture mechanisms in a bipercolated material: the example of austenoferritic duplex steels

B. Verhaeghe, F. Louchet, Y. Bréchet, J. P. Massoud

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

The mechanical behaviour of multiphased materials strongly depends on the topology of the hard phase. An extreme case is found when both the soft and hard phases percolate through the material. From a topological point of view, contrary to the case of isolated reinforcing particles, a crack nucleated in the hard phase can propagate in this phase through the entire crystal. From an energetic point of view however, this propagation requires plastic flow in the soft phase, which controls crack propagation. This situation is illustrated by the example of an aged austenoferritic duplex steel, in which a crack nucleated in brittle ferrite readily passes round austenite ligaments, whose plastic stretching controls the crack propagation. Final failure is considered to occur when crack size and average separation between crack nucleation sites become of the same order of magnitude, giving an excellent estimate of ductility.

Original languageEnglish
Pages (from-to)279-282
Number of pages4
JournalMaterials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume234-236
DOIs
Publication statusPublished - 30 Aug 1997
Externally publishedYes

Keywords

  • Bipercolated materials
  • Crack propagation

Cite this