| About this Abstract |
| Meeting |
2019 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Fatigue and Fracture III
|
| Presentation Title |
A Microstructural Investigation on the Crack Initiation Behavior of an Additively Manufactured Austenitic Stainless Steel |
| Author(s) |
Jonathan W. Pegues, Michael D Roach, Nima Shamsaei |
| On-Site Speaker (Planned) |
Jonathan W. Pegues |
| Abstract Scope |
Additive manufactured materials have been shown to have lower fatigue resistance than their wrought counterparts, which has resulted in industry wide hesitation to implement these parts in fatigue critical applications. Much of the research focus has been directed at the defects inherent to the additive manufacturing process and how they affect the fatigue behavior. However, many materials, such as austenitic stainless steels, show less sensitivity to defects such as pores and inclusions, and more sensitivity to microstructure. In this study the fatigue behavior of an austenitic stainless steel fabricated by laser powder bed fusion is examined and compared to the wrought counterpart. Specially designed square gage specimens are tested in the intermediate fatigue regime and interrupted periodically to conduct scanning electron microscopy and electron backscatter diffraction on the surface. The microstructural features responsible for crack initiation are detected and compared to results for wrought austenitic stainless steels. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |