|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Study of the nitriding behavior of an austenitic high entropy alloy powder
||Mathieu Traversier, Emmanuel Rigal, Pierre-Eric Frayssines, Xavier Boulnat, Franck Tancret, Jean Dhers, Anna Fraczkiewicz
|On-Site Speaker (Planned)
Austenitic single phase HEA from CoCrFeMnNi family usually have low yield strength. Among the numerous ways of strengthening the matrix, nitrogen alloying seems to be promising as it does not only improve the mechanical properties but also enhances the FCC phase stability.
In this study, nitriding of gas-atomised powders was studied and two alloys were investigated: the so-called Y3 HEA (CrFeMnNi family) and 304L steel, as the reference material. Nitriding kinetics was monitored by Thermo-Gravimetric Analysis. The evolution of the microstructure during the experiment was investigated through SEM, TEM and XRD analysis.
Massive amount of nitrogen (up to 4 wt. %) can be introduced in those alloys. Two families of precipitates, Cr2N and CrN, have been identified, as predicted by thermodynamic simulations. Nitriding kinetics seems to be solely dependent on the powder’s size. HIP densification was also performed to characterise the final mechanical properties of those alloys.
||High-Entropy Alloys, Powder Materials, Phase Transformations