About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Design, Materials, Manufacturing, Challenges and Applications
|
| Presentation Title |
Characterization of Process-Induced Cracks and Their Closure by Hot Isostatic Pressing in Laser Powder Bed Fusion AA-7075 |
| Author(s) |
Jacque Berkson, Edwin Schwalbach, Andrew Cassese, Chad Beamer, Antonio Ramirez |
| On-Site Speaker (Planned) |
Jacque Berkson |
| Abstract Scope |
Hot Isostatic Pressing (HIP) is a thermomechanical processing technique trusted and often required for additively manufactured components. However, observations of defect reopening during post-HIP heat treatment raise concerns regarding proper deployment of this technology and limitations for complete densification. Microstructural evolution throughout the entire manufacturing pipeline must also be considered to ensure components maintain the properties to survive their service environments. This work studies the formation and closure of defects in crack-prone aluminum alloy 7075 through printing, HIP, and post-HIP heat treatment. Detailed microstructural characterization throughout the manufacturing pipeline expose driving mechanisms for defect elimination by HIP, notably under a worst-case scenario in an un-weldable material. Further work discusses mechanisms for the reopening of cracks and other defects is also provided from a material-agnostic standpoint. Conclusions formed seek to inform the community of ways to incorporate HIP in an appropriate manner, producing parts more likely to be fit for service. |