Solidification path and phase transformation in super-austenitic stainless steel UNS S31254

Raphaël Marin (1, 2, 3) , Hervé Combeau (1) , Julien Zollinger (1) , Moukrane Dehmas (2) , Bernard Rouat (1) , Aude Lamontagne (3) , David Cardinaux (3) , Lucile Lhenry-Robert (3)

1 UL - Université de Lorraine
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 Centre de Recherche des Matériaux du Creusot

The solidification path and the σ-phase precipitation mechanism of UNS S31254 alloy were studied on the basis of directional solidified experiments accompanied by scanning electron microscopy observations and energy dispersive X-ray a nalysis. The resulting temperatures of solidification paths and phase transformation were compared with Gulliver-Scheil and equilibrium calculations predicted using ThermoCalc© software. It was confirmed that the experimental solidification path was in agreement with the thermodynamic calculations. The complementarity of the results have made it possible to propose a solidification path and a σ-phase precipitation mechanism for the UNS31254 steel.

Mots clés: Solidification path; Phase transformation; Superaustenitic stainless steel; UNS S31254 alloy -

Domaines: Matériaux

Raphaël Marin, Hervé Combeau, Julien Zollinger, Moukrane Dehmas, Bernard Rouat, et al.. Solidification path and phase transformation in super-austenitic stainless steel UNS S31254. IOP Conference Series: Materials Science and Engineering, 2019, 529, pp.012008. ⟨10.1088/1757-899X/529/1/012008⟩. ⟨hal-03195753⟩