Agency: Fédération Francilienne de Mécanique (F2M), Île de France France
Instrument: Coup de Pouce (Kickstarter) Grant 2019
GrantID: Coup de Pouce 2019
Institutions: Ecole Polytechnique and CentraleSupélec
Co-PIs: Manas V. Upadhyay and Eva Héripré
Core scientific team: Meriem Ben Haj Slama (post-doc)
Dates: October 2020 – September 2021
Funds: 50,000 €
Webpage: https://f2m.cnrs.fr/evenements/le-coup-de-pouce-de-la-f2m/
Objectives:
- Perform in situ rapid heating/cooling during transmission electron microscopy (TEM) to quantify how intragranular features, specifically precipitates, in additively manufactured stainless steel evolve during thermal cycling in the solid-state.
Methods:
- Laser Metal Deposition (LMD) of 316L stainless steel samples.
- SEM and TEM (including EELS / EDX) characterization of microstructure and chemical composition; SEM-FIB for lamella extraction; in situ heating/cooling inside TEM during thermal cycling.
- Use of aberration corrected STEM (Titan3 G2) to study precipitation evolution.
- Thermomechanical modelling using finite elements to estimate heating/cooling rates during thermal cycling.
Impact and Output:
- Filled a knowledge gap in understanding role of thermal cycling effects on precipitate evolution during metal AM.
- Developed a new in situ thermal cycling inside TEM protocol.
- Generated data that was later used to plan in situ synchrotron X-ray tomography studies during AM and served as proof-of-concept for the ERC Starting Grant GAMMA project.
Publication list:
- S. Gaudez, M. Ben Haj Slama, E. Héripré, L. Yedra, M. Scheel, S. Hallais and M. V. Upadhyay
“A synchrotron transmission X-ray microscopy study on precipitate evolution during solid-state thermal cycling of a stainless steel”
Additive Manufacturing, 73 (2023) 103692
Preprint DOI: 10.2139/ssrn.4379782
DOI: 10.1016/j.addma.2023.103692
- S. Gaudez, M. Ben Haj Slama, A. Kaestner and M. V. Upadhyay
“3D deep convolutional neural network segmentation model for precipitates and porosities identification in synchrotron X-ray tomograms”
Journal of Synchrotron Radiation, 29 (2022) 1232 – 1240
DOI: 10.1107/S1600577522006816
- M. Ben Haj Slama, L. Yedra, E. Héripré and M. V. Upadhyay
“Insight on precipitate evolution during additive manufacturing of stainless steels via in-situ heating-cooling experiments in a transmission electron microscope”
Materialia, 21 (2022) 101368
DOI: 10.1016/j.mtla.2022.101368
HAL (preprint): hal-03570116
- M. V. Upadhyay, M. Ben Haj Slama, S. Gaudez, N. Mohanan, L. Yedra, S. Hallais, E. Héripré and A. Tanguy
“Non-oxide precipitates in additively manufactured austenitic stainless steel”
Scientific Reports, 11 (2021) 10393
DOI: 10.1038/s41598-021-89873-2