Chen, Y;
Tang, YT;
Collins, DM;
Clark, SJ;
Ludwig, W;
Rodriguez-Lamas, R;
Detlefs, C;
... Yildirim, C; + view all
(2023)
High-resolution 3D strain and orientation mapping within a grain of a directed energy deposition laser additively manufactured superalloy.
Scripta Materialia
, 234
, Article 115579. 10.1016/j.scriptamat.2023.115579.
Preview |
Text
J371_Chen_Scripta_Mat_2023accepted.pdf - Accepted Version Download (6MB) | Preview |
Abstract
The industrialization of Laser Additive Manufacturing (LAM) is challenged by the undesirable microstructures and high residual stresses originating from the fast and complex solidification process. Non-destructive assessment of the mechanical performance controlling deformation patterning is therefore critical. Here, we use Dark Field X-ray Microscopy (DFXM) to map the 3D subsurface intragranular orientation and strain variations throughout a surface-breaking grain within a directed energy deposition nickel superalloy. DFXM results reveal a highly heterogenous 3D microstructure in terms of the local orientation and lattice strain. The grain comprises ≈ 5 μm-sized cells with alternating strain states, as high as 5 x 10^{-3}, and orientation differences <0.5°. The DFXM results are compared to Electron Backscatter Diffraction measurements of the same grain from its cut-off surface. We discuss the microstructure developments during LAM, rationalising the development of the deformation patterning from the extreme thermal gradients during processing and the susceptibility for solute segregation.
| Type: | Article |
|---|---|
| Title: | High-resolution 3D strain and orientation mapping within a grain of a directed energy deposition laser additively manufactured superalloy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.scriptamat.2023.115579 |
| Publisher version: | https://doi.org/10.1016/j.scriptamat.2023.115579 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Directed energy deposition, Laser additive manufacturing, Dark field x-ray microscopy, Electron backscatter diffraction, Microstructure |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10171766 |
Archive Staff Only
 |
View Item |
