About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing Modeling, Simulation, and Machine Learning: Microstructure, Mechanics, and Process
|
| Presentation Title |
In Situ Modulation of Residual Stresses During Laser Powder Bed Fusion |
| Author(s) |
Edwin J. Schwalbach, Rose Eckerle, Joshua Ward, Mark Obstalecki, Paul Shade, Mitchell Hughes, Gregory Sparks, Taylor Schuller, Christopher Budrow, Kelly Nygren, Diwakar Naragani |
| On-Site Speaker (Planned) |
Edwin J. Schwalbach |
| Abstract Scope |
Significant levels of residual stress accumulate during laser powder bed fusion printing of metals, and in extreme cases these can lead to buckling or cracking, ultimately causing build failures and scrap. This talk addresses in situ residual stress relief heat treatment strategies for Ti-6Al-4V for cases where residual stress challenges cannot be mitigated using conventional, post-build heat treatments. Fast-acting process modeling methodologies are combined with hole-drilling measurements to identify easy to compute metrics that correlate with residual stresses. Models are then exploited to design more efficient processing strategies, followed by additional characterization (including detailed microstructure evaluation) to validate the approach. Finally, X-ray Diffraction measurements executed at the Cornell High Energy Synchrotron Source are employed to generate detailed spatial maps of residual stress, and critically to establish the effectiveness of location-specific residual stress relief heat treatments. Future opportunities for further refinement will be discussed. |