Time-evolution of microstructure and mechanical behaviour of double annealed medium Mn steel |
| |
Authors: | Artem Arlazarov Mohamed Goune Olivier Bouaziz Frédéric Kegel Alain Hazotte |
| |
Affiliation: | 1. ArcelorMittal Mazières Research, Voie Romaine, Maizières-lès-Metz, Franceartem.arlazarov@arcelormittal.com;3. Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Pessac, France;4. Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université de Lorraine, Metz, France;5. ArcelorMittal Mazières Research, Voie Romaine, Maizières-lès-Metz, France |
| |
Abstract: | Cold rolled 0.1C-4.7Mn (wt-%) steel was submitted to double annealing. The holding time of second intercritical annealing at 650°C was varied between 3 min and 30?h. Tensile behavior after each treatment was measured and analysed. Microstructure characterisation was performed using field emission gun scanning electron microscope, transmission electron microscope and saturation magnetisation method. Moreover, interrupted tensile tests were done to obtain the kinetics of austenite destabilisation during straining. An important effect of soaking time on the microstructure and associate mechanical properties was revealed and analysed. Considering thermal and mechanical stability of retained austenite, the optimum combination of phases, providing the best strength-ductility balance, was found after 2?h holding.This paper is part of a Thematic Issue on Medium Manganese Steels. |
| |
Keywords: | Medium Mn steel double annealing tensile behavior strain hardening rate transformation induced plasticity (TRIP) microstructure fresh martensite retained austenite |
|
|