Adjusted Nitrogen Alloyed Stainless Steel with Optimized Thermal Processing for Superior Balanced Performance Navy SBIR FY2009.3 Sol No.: Navy SBIR FY2009.3 Topic No.: N093-166 Topic Title: Adjusted Nitrogen Alloyed Stainless Steel with Optimized Thermal Processing for Superior Balanced Performance Proposal No.: N093-166-0291 Firm: Navmar Applied Sciences Corporation 65 West Street Road Building C Warminster, Pennsylvania 18974 Contact: Jeffrey Waldman Phone: (215) 675-4900 Web Site: www.navmar.com Abstract: The materials used in Navy aircraft are prone to the harsh corrosive environment in which the aircraft operate. The corrosion protection of high performance bearing and gear steels without a decrease in mechanical and tribological properties is critical for Navy equipment readiness. Because of the insufficient corrosion resistance of current bearing and gear materials, the Navy developed corrosion inhibited oils for aircraft propulsion systems. The corrosion inhibitors in these oils limit their boundary lubrication (tribology) performance which limits the growth in power density needed for propulsion engine and gearbox systems. The purpose of this SBIR is to develop new high strength, corrosion resistant, wear resistant, scuffing resistant, rolling contact fatigue resistant stainless steels suitable for use in gears and bearings. These new steels are high chromium secondary hardening steels in which the secondary hardening response is enhanced by additions of cobalt and silicon. This SBIR will also utilize advanced surface modification techniques (i.e., low temperature carburizing and induction surface hardening) to further enhance the corrosion, mechanical and tribological properties of currently used bearing steels (e.g., Pyrowear 675, CX13VDW) and high nitrogen martensitic stainless steels (e.g., XD15NW) as well as the new ultra high strength stainless steels developed in this SBIR. Benefits: The new corrosion resistant, wear resistant, scuffing resistant, rolling contact fatigue resistant, high strength secondary hardened stainless steels, the low temperature carburized currently used bearing and gear steels (e.g., Pyrowear 675 and CX13VDW) and the induction surface hardened high nitrogen martensitic stainless steels (e.g., XD15NW) developed and evaluated in this SBIR will have excellent combinations of enhanced mechanical properties, good corrosion resistance and excellent tribological properties. These alloys in combination with the advanced surface modification processes will result in materials that are greatly beneficial for use on Navy aircraft as well as a wide range of structural applications for both the military and industrial markets. Return