par Godet, Stéphane 
;Georges, C.;Jacques, Patrice
Référence Symposium held at the Materials cience & Technology Meeting(09.11.2003-12.11.2003: Chicago, IL, United States), Austenite Formation and Decomposition, page (523-536)
Publication Publié, 2003
;Georges, C.;Jacques, PatriceRéférence Symposium held at the Materials cience & Technology Meeting(09.11.2003-12.11.2003: Chicago, IL, United States), Austenite Formation and Decomposition, page (523-536)
Publication Publié, 2003
Publication dans des actes
| Résumé : | Recent advances in the development of high performance steels presenting higher properties of strength and ductility rely on the TRIP effect, i.e. on the mech.-induced martensitic transformation of retained austenite dispersed in a soft ferrite-based matrix. As a consequence, the stabilization and retention of austenite at room temp. have become of primary importance, leading to specifically designed steel grades and thermal or thermomech. treatments. Particularly, carbon enrichment of the austenite during intercrit. annealing and bainite transformation was effective in retaining austenite. This study deals with the influence of chem., geometrical and mech. parameters of the microstructure of low alloy steels on the retention of austenite at room temp. The influence of different alloying elements on the inhibition of cementite pptn. and on the resulting austenite stabilization during the bainite transformation is scrutinised. The influence of the redn. in the austenite grain size on the mechanisms of nucleation and growth of bainite is demonstrated. Finally, the change in bainite morphol. resulting from prior deformation of the austenite is clearly exemplified and explained |
