About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Design, Materials, Manufacturing, Challenges and Applications
|
| Presentation Title |
Densification and Microstructural Evolution of Carbon-Infiltrated, Binder-Jet Printed 316L Stainless Steel |
| Author(s) |
James Oti, Ryan Wassel, Jung-Kun Lee, Nikhil Bajaj |
| On-Site Speaker (Planned) |
James Oti |
| Abstract Scope |
Binder jet printing (BJP) is an additive manufacturing technique capable of producing dense stainless steel parts. A major challenge of BJP is how to increase density without increasing sintering temperature. One solution involves infiltration with a lower-melting-point material – such as bronze – during sintering, such that the bronze diffuses into the part’s pores, thereby increasing the part’s density. However, this process has limited flexibility given that it is conducted inside the furnace at high temperature and requires additional equipment and configuration. Furthermore, introducing bronze at the grain boundaries decreases stainless steel’s mechanical strength. These issues are addressed by performing room-temperature infiltration of carbon microparticles into the debinded part before sintering. Part density is increased through a liquid phase sintering mechanism in which Fe-C eutectic liquid is formed at the grain boundaries. Moreover, this approach can be integrated into part identification and anticounterfeiting applications, demonstrated using experimental and simulation methods. |