In order for metal Additive Manufacturing (AM) to reach its full potential, AM produced components must achieve mechanical and physical properties consistent with wrought materials produced by conventional manufacturing methods. Many times, these mechanical properties are achieved as a result of extensive thermal or mechanical processing methods such as cold rolling or forging that are not compatible with Additive Manufacturing.
Under a Navy STTR program, SHEPRA, INC. and the University of Dayton Materials Engineering department have been investigating the use of carbon nanotubes to create a carbon nanotube metal matrix composite (CNMMC) to improve the mechanical properties of 17-4 Stainless Steel to achieve mechanical properties that meet or exceed the ASTM specification of H1025 17-4 precipitation hardened stainless steel. To date significant progress has been made to eliminate the Luders bands at the yield point through the use of carbon nanotubes and improve mechanical properties without a significant reduction on elongation. This presentation will provide up to date mechanical properties and analysis of microstructure and metallurgical mechanisms that enable the mechanical property improvements.
- Understand the potential benefits of carbon nanotube metal matrix composites
- Understand the materials sciences involved in how the carbon nanotubes interact with metal to act as a strengthening composite.
- Understand the potential application of carbon nanotube metal matrix composites.