J. Phys. IV France 11 (2001) Pr4-173-Pr4-180
Transformation induced plasticity in martensitic transformation of ferrous alloysS. Grostabussiat1, L. Taleb2, J.F. Jullien1 and F. Sidoroff3
1 INSA Lyon/URGC/Structures, 20 avenue Albert Einstein, 69621 Villeurbanne cedex, France
2 INSA Rouen/LMR, UMR 6138, avenue de l'Université, BP. 08, 76801 Saint-Etienne-du-Rouvray, France
3 ECL/LTDS, UMR 5513, 136 avenue Guy de Collongue, BP. 163, 69131 Ecully cedex, France
An experimental characterisation of transformation induced plasticity (TRIP) and related phenomena is presented for the martensitic transformation in a 16MND5 steel. Two problems are considered Assessment of the primacy of Magee or Greenwood-Johnson mechanisms : this is achieved through the evolution of TRIP in a repeated cyclic TRIP test which should be reversible for Magee mechanism and cumulative for Greenwood-Johnson mechanism. The second case is observed showing thus that Greenwood-Johnson mechanism is dominant. Coupling of an austenitic prehardening with the TRIP behavior : it is shown that this behavior is strongly influenced by a tensile or compressive prehardening and that this influence cannot be described, as sometimes mentioned, through some kind of kinematic hardening.
© EDP Sciences 2001