Critical factors governing the thermal stability of austenite in an ultra-fined grained medium-Mn steel

Artem Arlazarov (1, 2) , Mohamed Gouné (3) , Olivier Bouaziz (1) , Alain Hazotte (1)

1 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
2 ArcelorMittal Maizières Research SA
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The time-evolution of retained austenite at 650 °C is shown to be a fair indicator of the factors governing the austenite stability. The grain size contribution to austenite stability is evidenced and a martensite start temperature (Ms) law applicable to medium-Mn steels and including both the chemical and size effects is determined.

Mots clés: Medium-Mn steels; retained austenite; stability; Ms temperature

Domaines: Matériaux

Artem Arlazarov, Mohamed Gouné, Olivier Bouaziz, Alain Hazotte. Critical factors governing the thermal stability of austenite in an ultra-fined grained medium-Mn steel. Philosophical Magazine Letters, 2017, 97 (4), pp.125-131. ⟨10.1080/09500839.2017.1290293⟩. ⟨hal-01491911⟩