I2M, France
Lorène Héraud
Biography
Lorène Héraud is an Associate Professor at the I2M laboratory in Bordeaux, France. Her research and teaching activities are centered around the link between microstructure and mechanical properties of the materials, she focuses on the phenomena appening during solicitation (quasi-static, fatigue or temperature) at the scale of the microstructure (deformations, phase transformation…), contributing to the advancement of engineering and materials science within her department.
Conferences
Room |
Date |
Hour |
Subject |
|---|---|---|---|
| Room 9 |
26-03-2026 |
11:15 am – 11:35 am |
48 Small-angle scattering characterization of the microstructure of an additively manufactured 316L and its evolution during heat treatment |
Conferences Details
48 Small-angle scattering characterization of the microstructure of an additively manufactured 316L and its evolution during heat treatment
Laser Powder Bed Fusion (LPBF) enables the fabrication of stainless steel components with complex geometries and hierarchical microstructures. This study focuses on the multiscale microstructural evolutions of LPBF 316L stainless steel, combining localized imaging (SEM, TEM) and volumetric analysis via Small-Angle X-ray Scattering (SAXS). Ex-situ and in-situ heat treatments were performed to investigate the evolution of dislocation structures, segregation cells, and nano-oxides. While conventional microscopy revealed persistent grain morphology and gradual dissolution of segregation features, SAXS provided statistically representative insights into nano-oxide populations. A bimodal distribution of nano-oxides was observed in the as-built state, with significant coarsening and phase transformation at elevated temperatures. The integration of SAXS and TEM allowed to describe the emergence of sigma-phase precipitates and the disappearance of smaller oxide populations at 900 °C.
Keywords: Small-Angle X-ray Scattering (SAXS); Laser Powder Bed Fusion (LPBF); 316L Stainless Steel; In-situ characterization
