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Effect of tip relief on endurance characteristics of super nitralloy and AISI M-50 spur gears (1974)

Townsend, D. P. ; Zaretsky, E. V.

In: CASI

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Publication Date: 2019-06-27

Description: Tests were conducted with two groups of 8.89-centimeter (3.5-in.) pitch diameter spur gears with standard 20 deg involute profile with tip relief made of CVM Super-Nitralloy (5Ni-2Al) and CVM AISI M-50 at a temperature of 350 K (170 F). Super-Nitralloy gears with tip relief had a life 150 percent that of gears without tip relief. An increased scoring phenomenon was noted with the Super-Nitralloy gears with tip relief. Through-hardened AISI M-50 gears with tip relief failed due to tooth fracture. AISI M-50 gears without tip relief had a life approximately 40 times greater than the AISI M-50 gears with tip relief.

Keywords: MACHINE ELEMENTS AND PROCESSES

Type: NASA-TN-D-7535

Format: application/pdf

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