Monitoring the kinetics of the γ’ phase in the N18 superalloy using in situ electrical resistivity measurements

Suivi de la cinétique associée à la phase gamma' dans le superalliage N18 en utilisant des mesures de résisitivité électrique in situ

Imed-Eddine Benrabah (1, 2) , Gader Altinkurt (1, 3) , Mathieu Fevre (3) , Moukrane Dehmas (4) , Benoit Denand (1) , Frédéric Fossard (5) , Jean Sébastien Mérot (5) , Guillaume Geandier (1) , Didier Locq (5) , Mikael Perrut (5)

1 IJL - Institut Jean Lamour
2 SIMaP - Science et Ingénierie des Matériaux et Procédés
3 Laboratoire d'étude des microstructures - LEM, UMR 104, CNRS-ONERA, Université Paris-Saclay
4 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
5 DMAS, ONERA, Université Paris Saclay (COmUE) [Châtillon]

In nickel-based superalloys, temperatures related to the formation or the dissolution of the different types of γ' precipitates are important parameters for optimizing the mechanical properties of components but also for developing models which can reproduce the kinetics of their phase transformation. We showed that the electrical resistivity variations during heat treatment of the N18 superalloy was sufficient to monitor the kinetics related to secondary and tertiary γ' precipitates. In particular, the effects of the heating rate and the initial microstructure on the dissolution kinetics of the γ' phase were investigated. Experimental results were also compared to outputs of a precipitation model developed for the N18 alloy showing that in situ electrical resistivity measurements can be used for calibration and validation purposes.

Mots clés: NICKEL-BASED SUPERALLOYS; MICROSTRUCTURE; DISSOLUTION/PRECIPITATION KINETICS; ELECTRICAL RESISTIVITY.

Mots clés: SUPERALLIAGE À BASE DE NICKEL; MICROSTRUCTURE; CINÉTIQUE DE PRÉCIPITATION/DISSOLUTION; RÉSISTIVITÉ ÉLECTRIQUE

Domaines: Sciences de l'ingénieur [physics]; Physique [physics]; Chimie

Imed-Eddine Benrabah, Gader Altinkurt, Mathieu Fevre, Moukrane Dehmas, Benoit Denand, et al.. Monitoring the kinetics of the γ’ phase in the N18 superalloy using in situ electrical resistivity measurements. Journal of Alloys and Compounds, 2020, 825 (154108), pp.1-9. ⟨10.1016/j.jallcom.2020.154108⟩. ⟨hal-02470234⟩