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A Life Study of Ausforged, Standard Forged and Standard Machined AISI M-50 Spur GearsTests were conducted at 350 K (170 F) with three groups of 8.9 cm (3.5 in.) pitch diameter spur gears made of vacuum induction melted (VIM) consumable-electrode vacuum-arc melted (VAR), AISI M-50 steel and one group of vacuum-arc remelted (VAR) AISI 9310 steel. The pitting fatigue life of the standard forged and ausforged gears was approximately five times that of the VAR AISI 9310 gears and ten times that of the bending fatigue life of the standard machined VIM-VAR AISI M-50 gears run under identical conditions. There was a slight decrease in the 10-percent life of the ausforged gears from that for the standard forged gears, but the difference is not statistically significant. The standard machined gears failed primarily by gear tooth fracture while the forged and ausforged VIM-VAR AISI M-50 and the VAR AISI 9310 gears failed primarily by surface pitting fatigue. The ausforged gears had a slightly greater tendency to fail by tooth fracture than the standard forged gears.
Document ID
19750018305
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Townsend, D. P. (NASA Lewis Research Center Cleveland, OH, United States)
Bamberger, E. N. (GE Co. Evendale, Ohio, United States)
Zaretsky, E. V. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1975
Subject Category
Mechanical Engineering
Report/Patent Number
E-8258
NASA-TM-X-71748
Accession Number
75N26377
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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