| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
|
| Presentation Title |
The Effect of Nano-scale Porosity on the SCC Behavior of AM 17-4PH in the Peak- and Over-aged Condition |
| Author(s) |
James Burns, Trevor Shoemaker, Zach Harris |
| On-Site Speaker (Planned) |
James Burns |
| Abstract Scope |
Recent work has shown increased SCC susceptibility in AM 17-4PH when compared to its wrought equivalent. In particular, AM crack growth rates were shown to be up to five-times faster than wrought 17-4PH under cathodic electrochemical potentials. These differences are evaluated in the context of a micro-mechanical damage model that links the sensitivity of the local crack dip damage evolution to the underlying microstructural features. This analysis paradigm enables an unambiguous investigation of the role of AM specific microstructures on the resulting macroscale engineering properties. This presentation will focus on the important impact of nano-scale porosity on the SCC susceptibility and how the sensitivity of these features vary between a peak-age (H900) and overaged (H1025) temper. The results from this work are intended to rigorously identify microstructural features leading to deficiencies in AM 17-4PH SCC behavior so that they may be targeted for amelioration in future AM processing modifications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Environmental Effects |