High-resolution 3D strain and orientation mapping within a grain of a directed energy deposition laser additively manufactured superalloy

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 therefo...

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Bibliographic Details
Published in:Scripta materialia 2023-09, Vol.234, p.115579, Article 115579
Main Authors: Chen, Y., Tang, Y.T., Collins, D.M., Clark, S.J., Ludwig, W., Rodriguez-Lamas, R., Detlefs, C., Reed, R.C., Lee, P.D., Withers, P.J., Yildirim, C.
Format: Article
Language:English
Subjects:
Dark field x-ray microscopy
Directed energy deposition
Electron backscatter diffraction
Engineering Sciences
Laser additive manufacturing
MATERIALS SCIENCE
Microstructure
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Summary: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 ×10−3, and orientation differences
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2023.115579