A new class of high strength, secondary hardening gear steelsthat are optimized for high-temperature, low-pressure (i.e.,vacuum) carburization is being developed. These alloys werecomputationally designed as secondary-hardening steels at threedifferent levels of case hardness. The exceptional case hardness,in combination with high core-strength and toughness properties,offer the potential to reduce drive train weight or increase powerdensity relative to incumbent alloys such as AISI 9310 or Pyrowear®X53. This new class of alloys utilizes an efficient nano-scale M2Ccarbide strengthening dispersion, and their key benefits include:high fatigue resistance (contact, bending, scoring); highhardenability achieved via low-pressure carburization (thusreducing quench distortion and associated manufacturing steps); atempering temperature of >900°F to provide up to a 500°Fincrease in thermal stability relative to incumbent alloys; andcore tensile strengths in excess of 200 ksi. Ferrium C69ÿ, is onealloy in this family that can achieve a carburized surface hardnessof HRC 67 (with a microstructure substantially free of primarycarbides), has exceptionally high contact fatigue resistance whichmake it an excellent candidate for applications such as camshaftsand bearings as well as gear sets.
- Edition:
- 09
- Published:
- 09/01/2009
- Number of Pages:
- 13
- File Size:
- 1 file , 710 KB
Reviews
There are no reviews yet.