| About this Abstract |
| Meeting |
10th International Symposium on Superalloy 718 and Derivatives (2023)
|
| Symposium
|
Superalloy 718 and Derivatives
|
| Presentation Title |
Investigating the Influence of Build Parameters and Porosity on Fatigue of AM IN718 |
| Author(s) |
Alexander N. Caputo, Rick Neu, Xiayun Zhao, Chaitanya Vallabh, Haolin Zhang |
| On-Site Speaker (Planned) |
Alexander N. Caputo |
| Abstract Scope |
Using laser powder bed fusion additive manufacturing a series of 10 walls along with two turbine blades were made, sectioned into fatigue specimens, and tested using high cycle fatigue testing with a stress ratio of 0.1 at 538℃. Each wall was built with different parameters to explore the effects of different laser-material interaction modes (conduction, transition, keyhole) on the effect of the internal porosity and microstructure of AM IN718 as well as the subsequent fatigue properties. The internal porosity in the full gage regions of all fatigue specimens was characterized prior to testing using X-ray computed tomography. Following fatigue testing, SEM fractography was used to identify the location of the fatigue critical flaw that led to failure. Using the XCT porosity data and fatigue test results, and critical flaw locations, a machine learning model was trained to predict fatigue performance of IN718 at high temperature given information on build parameters and non-destructively collected XCT porosity data. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |