About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Beyond the Beam III
|
| Presentation Title |
Impact of Grain Boundary Mobility on Decreasing Porosity in Metal Binder Jetting of Free-sintering Low-alloy Steel |
| Author(s) |
Stephen D. House, Pedro De Souza-Ciacco, Javier Ignacio Carreno, Jackeline Vicente-Vazquez, Calixto Isaac Garcia |
| On-Site Speaker (Planned) |
Stephen D. House |
| Abstract Scope |
Metal Binder Jetting (MBJ) Additive Manufacturing (AM) involves the deposition of metal powder layer-by-layer, held together by a polymeric glue/binder. The printed part is then sintered to its final shape and density. Minimizing residual porosity remains a key issue for MBJ – particularly for applications with high-cycle-time fatigue (e.g., automotive) – compared to Laser Powder Bed Fusion, a more-established AM technique. The dual-phased Free-Sintering Low-Alloy (FSLA) steel is designed for enhanced diffusion at the sintering temperature to promote high densities, and its microstructure can be tailored by post-sintering heat treatment to produce a wide range of mechanical properties. Herein we present our investigation of the microstructural characteristics of the FSLA system and the impact of grain boundary mobility on decreasing the porosity of MBJ-printed components. By employing nano- to micro-scale characterization (S/TEM, SEM, EBSD, micro-indentation) and modeling, we show how 98% of the theoretical density of ferrite can be achieved. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Powder Materials, |