Title :

Improving the fatigue life of laser powder bed fusion Scalmalloy® by friction stir processing

Author(s) :

van der Rest, Camille [Auteur]
Université Catholique de Louvain = Catholic University of Louvain [UCL]
De Raedemacker, Sophie [Auteur]
Université Catholique de Louvain = Catholic University of Louvain [UCL]
Avettand-Fènoël, Marie-Noëlle [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Pyka, Grzegorz [Auteur]
Université Catholique de Louvain = Catholic University of Louvain [UCL]
Cocle, Roger [Auteur]
Simar, Aude [Auteur]
Université Catholique de Louvain = Catholic University of Louvain [UCL]

Journal title :

Materials & Design

Abbreviated title :

Materials & Design

Volume number :

244

Pages :

113193

Publisher :

Elsevier BV

Publication date :

2024-08

ISSN :

0264-1275

English keyword(s) :

Laser powder bed fusion
Friction stir processing
High-strength Al alloy
Scalmalloy®
Fatigue

HAL domain(s) :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

English abstract : [en]

A major concern about parts produced by laser powder bed fusion (L-PBF) are intrinsic defects or porosities that are difficult to overcome by simply optimizing the process parameters. As these defects and porosities play ...
Show more >A major concern about parts produced by laser powder bed fusion (L-PBF) are intrinsic defects or porosities that are difficult to overcome by simply optimizing the process parameters. As these defects and porosities play a crucial role in the mechanical behaviour, especially in fatigue, additive manufactured parts are often subjected to thermo-mechanical post-treatments. To this end, this work proves Friction Stir Processing (FSP) to be an effective post-treatment to drastically reduce the porosity level. FSP leads to an improvement of 60 % of the technical fatigue strength and by two orders of magnitude of the fatigue life of L-PBF Scalmalloy® specimens. The fatigue performances obtained on FSPed and heat-treated specimens are equivalent or even better than the best fatigue life reported in the literature, whatever their L-PBF conditions and post-treatments, while avoiding Hot Isostatic Pressing. However, FSP reduces the beneficial effect of the conventional strengthening heat-treatment applied to L-PBF Scalmalloy®, lowering the high tensile strength for which the alloy is normally reputed. Advanced characterisation by X-ray microtomography and Transmission Electron Microscopy allows us to reach a better understanding of the involved phenomena: drastic reduction of the biggest defects and heterogeneous nucleation of Sc- and Zr-rich precipitates on grain boundaries and dislocations.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Métallurgie Physique et Génie des Matériaux

Submission date :

2024-08-28T11:00:32Z
2024-08-30T07:58:23Z