| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
|
| Presentation Title |
Post-processing of Additively Manufactured 316 Stainless Steel by Electron Wind Force |
| Author(s) |
Daudi R. Waryoba, James Kidd, Zahabul Islam, Aman Haque |
| On-Site Speaker (Planned) |
Daudi R. Waryoba |
| Abstract Scope |
Application of the electron wind force as a driver for low temperature post processing of metals and alloys has been demonstrated in additively manufactured 316 stainless steel. This was achieved by passing dc current while actively cooling the specimen to maintain ambient surface temperature. Since EWF is proportional to the electric current density, it was observed that as the current density is gradually increased, there is a critical current density at which the EWF is sufficient to cause grain boundary and defect migration. At this “BURST” point, the microstructure instantly transforms to a refined equiaxed microstructure in a manner similar to thermally activated recrystallization. Prolonged biasing, on the other hand, results to grain growth as well as abnormal grain growth. Microstructural characterization by electron backscattered diffraction (EBSD) reveals interesting results on grain size, grain boundary structure, microtexture, and local orientation spread in the grains. |