About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Advanced Characterization With Synchrotron, Neutron, and In Situ Laboratory-scale Techniques IV
|
| Presentation Title |
Integrating In-Situ Strain Sensing and Neutron Diffraction to Realize Residual Stress–Microstructure Relationships in Laser Powder Bed Fusion |
| Author(s) |
Holden C. Hyer, Chris M Fancher, Sebastien Dryepondt, Christian M. Petrie |
| On-Site Speaker (Planned) |
Holden C. Hyer |
| Abstract Scope |
Rapid solidification in laser powder bed fusion (LPBF) induces large thermal gradients that generate residual stress, affecting microstructure and part performance. In this study, SS316 blocks and overhangs were fabricated using varied laser energy densities to vary cooling rates and resulting strain. Process anomalies were detected using visible and infrared camera images analyzed via a neural network. Fiber-optic strain sensors deployed on the build plate captured spatially resolved, in-situ strain evolution during fabrication. Residual strain was subsequently measured ex-situ in similar components using neutron diffraction. Sub-sized tensile specimens were extracted to assess the influence of residual stress on strength and microstructure. Although in-situ and ex-situ strain trends tracked with energy density, their magnitudes diverged—reflecting the influence of process anomalies on in-situ data and dislocation substructure on ex-situ results. These complementary strain measurements elucidate both process stability and material quality, enabling more effective training of data-driven defect prediction models. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Nuclear Materials, Solidification |