Aircraft Quality High Temperature Vacuum Carburizing
Final rept. Apr 1982-Feb 1990
BOEING HELICOPTERS PHILADELPHIA PA
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Development of a high temperature vacuum carburizing procedure for 9310 gear steel was accomplished during this program. Use of this procedure significantly reduced processing time of gears, which can lead to a reduction in acquisition costs. The procedure was utilized to process surface contact fatigue, single tooth bending fatigue, scoring, spur, and spiral bevel test gears. The data obtained from the testing and evaluation of these components was equal to or greater than similar data from conventionally carburized material. No significant variation in the vacuum carburized test data was observed from two mill heats of material. Following evaluation of these test gears, a spiral bevel input pinion gear was produced, vacuum carburized, and then tested in an actual helicopter transmission. Metallurgical evaluation of the tested gear showed that it met the same performance standards required of a conventionally carburized gear. In addition, a vacuum carburization procedure was investigated for the Vasco X2M alloy. Although a procedure for Vasco X2M was developed, it was not optimized. The data generated for this alloy is presented.
- Metallurgy and Metallography