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RESEARCH PAPERS

A Life Study of AISI M-50 and Super Nitralloy Spur Gears With and Without Tip Relief

[+] Author and Article Information
D. P. Townsend, E. V. Zaretsky

Lewis Research Center, National Aeronautical and Space Administration, Cleveland, Ohio

J. of Lubrication Tech 96(4), 583-589 (Oct 01, 1974) (7 pages) doi:10.1115/1.3452501 History: Received July 13, 1973; Online October 18, 2010

Abstract

Tests were conducted at 350 K (170 deg F) with groups of 8.9 cm (3.5-in.)-pitch-diameter spur gear with and without tip relief made of consumable-electrode vacuum melted (CVM) Super Nitralloy (5Ni-2Al) and CVM AISI M-50 steel. The AISI M-50 gears without tip relief had lives approximately 50 percent longer than the Super Nitralloy gears without tip relief. However, the Super Nitralloy gears with tip relief had lives equal to the AISI M-50 gears without tip relief. The difference in lives were not statistically significant. All gears failed by classical pitting fatigue at the pitch circle. However, the AISI M-50 gears with tip relief failed by tooth fracture. AISI M-50 gear sets without tip relief having a spalled gear tooth which were deliberately overrun after spalling had occurred, failed by tooth fracture.

Copyright © 1974 by ASME
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