Evaluation Of The Impact Of Thermal Strain Hardening On The Precipitation Of Strengthening Phases During L-PBF Manufacturing Of A Model Aluminum Alloy: Towards The Definition Of An Alloy Grade Designed

Authors:

Louise Toualbi (ONERA, France),
Yann Le Bouar (ONERA, France),
Jean-Sébastien Mérot (ONERA, France),
Federico Orlacchio (ONERA, France),
Pauline Stricot (ONERA, France),
Agnès Bahcelier-Locq (ONERA, France),
Nicolas Horezan (ONERA, France),
Denis Boivin (ONERA, France),
Cécile Davoine (ONERA, France),
Marc Thomas (ONERA, France)

Abstract:

The L-PBF process features very short interactions between the powder and the laser, resulting in very high solidification and cooling rates. During thermal cycling in L-PBF processing, phase precipitation and thermal strain hardening occur concomitantly, thus leading to high dislocation density correlated with anchoring to precipitates. It is therefore important to understand and control precipitation kinetics with respect to the thermal strain hardening phenomena generated by the thermal cycles of the L-PBF process. This issue concerns structural hardening aluminium alloys.The aim of this study is to understand the thermal, metallurgical and mechanical phenomena generated during the manufacture of a model aluminium alloy (Al-4Fe) by L-PFB, in order to evaluate the impact of thermal strain hardening on the precipitation of the strengthening phases. A fine microstructural characterization using scanning electron microscopy and transmission electron microscopy shows a strong the interaction between dislocation density and precipitation.

DOI:

https://doi.org/10.59499/WP225371451