On the influence of interactions between phases on the mechanical stability of retained austenite in transformation-induced plasticity multiphase steels |
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Authors: | P J Jacques F Delannay J Ladrière |
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Affiliation: | (1) Division of Physical Chemistry and Engineering of Materials, the Catholic University of Louvain, B-1348, Louvain-la-Neuve, Belgium;(2) Division of Inorganic and Nuclear Chemistry, the Catholic University of Louvain, B-1348, Louvain-la-Neuve, Belgium |
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Abstract: | 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. |
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