Unveiling 3D sub-grain residual stresses in as-built additively manufactured steel using scanning 3DXRD
Non-destructive mapping of 3D microstructures in metal additive manufacturing (AM) remains challenging due to large orientation gradients and residual stress (RS) magnitudes. We leveraged scanning 3D X-ray diffraction (s3DXRD) to non-destructively resolve intragranular orientation-strain states and...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2025-07-01
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| Series: | Materials Research Letters |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/21663831.2025.2502502 |
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| Summary: | Non-destructive mapping of 3D microstructures in metal additive manufacturing (AM) remains challenging due to large orientation gradients and residual stress (RS) magnitudes. We leveraged scanning 3D X-ray diffraction (s3DXRD) to non-destructively resolve intragranular orientation-strain states and RS in laser powder bed fusion (L-PBF) SS316L for the first time. Type III von Mises RS displayed significant variation with proximity to grain boundaries, and in some locations, exceeded the macroscopic yield strength of L-PBF SS316L. Interestingly the spatial distribution of RS showed no correlation with orientation gradients, suggesting that stress relaxation during solidification is accommodated by lattice rotation. |
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| ISSN: | 2166-3831 |