| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Large-Scale Metal Additive Manufacturing
|
| Presentation Title |
Wire Arc Processing of Stainless Steels; Microstructure and Properties |
| Author(s) |
Patxi Fernandez-Zelaia, Quinn Campbell, Chris Ledford, Michael Kirka, Andrzej Nycz, Mark Noakes, Lonnie Love |
| On-Site Speaker (Planned) |
Patxi Fernandez-Zelaia |
| Abstract Scope |
Large scale additive manufacturing (AM) offers significant opportunities to scale AM processing to larger engineering components. While the process is driven by established welding fundamentals many materials challenges need to be addressed to enable widespread industrial adoption. In this work we present our recent work on arc welding AM of 316L and 17-4PH stainless steels. In 316L an extremely sharp crystallographic texture is observed with a strong {011} preference in the build direction. This solidified microstructure is driven by the weld pool morphology and deposition pattern. The 17-4PH material is martensitic with lathes effectively homogenizing the microstructure. Mechanical tests reveal that the 316L exhibits extremely anisotropic behavior, behaving nearly as a single crystal, whereas the 17-4PH is isotropic. This work demonstrates that detailed characterization of deposited material is necessary for qualification of AM materials and that the behavior can be rationalized based on the fundamental process-structure-property relations. |