The Approach:

 

(AM produced carbon nanotube metal matrix composite)

Under its STTR contract with the Navy.
SHEPRA working with the University of Dayton Materials Engineering Department developed a Carbon Nanotube – 17-4 Stainless Steel Metal Matrix Composite for use in Additive Manufacturing.

The Need:

The United States Navy needed a new formulation of 17-4 Stainless Steel to meet is current needs. Current 17-4 Stainless Steel used in Additive Manufacturing had half the mechanical strength of conventional processed materials.

The Result:

A 16% increase in modulus, 22% increase in yield strength and 29% increase in hardness versus AM fabrication of regular 17-4 Stainless Steel. Research is on going to further increase the mechanical properties of 17-4 Stainless Steel and transition the technology to other metal systems such as Titanium, Aluminum and other Steel Alloys.

(Comparison of regular 17-4 AM produced (Blue), Carbon Nanotube Metal Matrix AM Produced (Red) and conventionally produced 17-4 SS H900 HT (Green) and H1150 HT (Yellow))