Ferrium® C61™ and C64™ are new secondary-hardening steels thatprovide superior mechanical properties versus 9310, 8620, Pyrowear®Alloy 53 and other steels typically used for power transmission,such as significantly higher core tensile strength, fracturetoughness, fatigue strength and thermal stability (i.e. temperingtemperature). One recent example of their application is the 2010Small Business Innovation Research (SBIR) Phase IIAwardQuesTekreceived from the U.S. Army to demonstrate the application ofC61 tothe forward rotor shaft ofCH-47 Chinook helicopter (working inconjunction with The Boeing Corporation), in order to reduce theweight of the shaft by 15-25% and provide other benefits.
This paper will review the significant manufacturing andprocessing benefits that arise from this new class ofsecondary-hardening steels, and analyze the potential implicationsand opportunities. C61 and C64 were computationally designed totake advantage of high-temperature, low-pressure (i.e. vacuum)carburization technology, in part by combining carburizing andaustenitizing steps as well as being designed to have very highhardenability. The very high hardenability of these steels permitsa mild gas quench subsequent to low-pressure vacuum carburizing andreduces part distortion, thus reducing grind stock removal,simplifying final machining and heat treat operations. A frameworkanalysis will be used to compare total manufacturing/productioncosts and impacts (including environmental) of these new steelsversus traditional gear steels. Conclusions and recommendationswill be drawn regarding best manufacturing practices andappropriate use of these new steels for product applications.
- Edition:
- 11
- Published:
- 10/01/2011
- Number of Pages:
- 14
- File Size:
- 1 file , 830 KB
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