Effect of Ni, Mo and Mn content on spinodal decomposition kinetics and G-phase precipitation of aged model cast austenitic stainless steels

R. Badyka (1, 2) , S. Saillet (1) , J Emo (2) , Christophe Domain (1, 3) , Cristelle Pareige (2)

1 EDF R&D MMC - Matériaux et Mécanique des Composants
2 GPM - Groupe de physique des matériaux
3 EM2VM - Etude et Modélisation des Mécanismes de Vieillissement des Matériaux

During ageing, the ferritic phase of Cast Austenitic Stainless Steels (CASS) undergoes decomposition by spinodal decomposition and G-phase precipitation, which leads to increasing hardness and decreasing impact toughness. Mo-bearing steels are more prone to ageing than Mo-free steels. To study the effects of Ni, Mo, and Mn, duplex model alloys were thermally aged at 350 and 400°C. The microstructure evolution during ageing was characterized by atom probe tomography. Only Ni additions seem to affect the spinodal decomposition kinetics. Ni accelerates the spinodal decomposition kinetics regardless of the presence of Mo or Mn. Additions of Mo and Mn promote the precipitation of G-phase.

Keywords: kinetics; Atom probe tomography; Spinodal decomposition; G-phase precipitation; models alloys

Domains: Physics [physics]; Condensed Matter [cond-mat]; Materials Science [cond-mat.mtrl-sci]

R. Badyka, S. Saillet, J Emo, Christophe Domain, Cristelle Pareige. Effect of Ni, Mo and Mn content on spinodal decomposition kinetics and G-phase precipitation of aged model cast austenitic stainless steels. Journal of Nuclear Materials, 2021, 555, pp.153123. ⟨10.1016/j.jnucmat.2021.153123⟩. ⟨hal-03254730⟩