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On the influence of interactions between phases on the mechanical stability of retained austenite in transformation-induced plasticity multiphase steels

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Jacques, Pascal [UCL] Ladrière, Jean [UCL] Delannay, Francis [UCL]

The mechanical stability of dispersed retained austenite, i.e., the resistance of this austenite to mechanically induced martensitic transformation, was characterized at room temperature on two steels which differed by their silicon content. The steels had been heat treated in such a way that each specimen presented the same initial volume fraction of austenite and the same austenite grain size. Nevertheless, depending on the specimen, the retained austenite contained different amounts of carbon and was surrounded by different phases. Measurements of the variation of the volume fraction of untransformed austenite as a function of uniaxial plastic strain revealed that, besides the carbon content of retained austenite, the strength of the other phases surrounding austenite grains also influences the austenite resistance to martensitic transformation. The presence of thermal martensite together with the silicon solid-solution strengthening of the intercritical ferrite matrix can "shield" austenite from the externally applied load. As a consequence, the increase of the mechanical stability of retained austenite is not solely related to the decrease of the M-s temperature induced by carbon enrichment.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2001
Language Anglais
Journal information "Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science" - Vol. 32, no. 11, p. 2759-2768 (2001)
Peer reviewed yes
Publisher Minerals Metals Materials Soc (Warrendale)
issn 1073-5623
e-issn 1543-1940
Publication status Publié
Affiliation UCL - FSA/MAPR - Département des sciences des matériaux et des procédés
Links
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Bibliographic reference Jacques, Pascal ; Ladrière, Jean ; Delannay, Francis. On the influence of interactions between phases on the mechanical stability of retained austenite in transformation-induced plasticity multiphase steels. In: Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, Vol. 32, no. 11, p. 2759-2768 (2001)
Permanent URL http://hdl.handle.net/2078.1/42428