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Surface fatigue and failure characteristics of hot forged powder metal AISI 4620, AISI 4640, and machined AISI 4340 steel spur gearsSpur gear surface fatigue endurance tests were conducted to investigate hot forged powder metal AISI 4620 and 4640 steel for use as a gear material, to determine endurance characteristics and to compare the results with machined AISI 4340 and 9310 steel gear materials. The as-forged and unground SISI 4620 gear exhibited a 10 percent fatigue life that was approximately one-fourth of that for AISI 9310 and less than one-half that for the AISI 4340 gears. The forged and finish ground AISI 4620 gears exhibited a 10 percent life, approximately 70 percent that of AISI 9310 and slightly better than that of AISI 4340. The AISI 4640 hot forged gears had less fracture toughness and slightly less fatigue life than the AISI 4620 test gears.
Document ID
19860022417
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Townsend, D. P. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1986
Subject Category
Mechanical Engineering
Report/Patent Number
E-3024
NAS 1.15:87330
NASA-TM-87330
Report Number: E-3024
Report Number: NAS 1.15:87330
Report Number: NASA-TM-87330
Meeting Information
Meeting: Annual Meeting of the American Society of Lubrication Engineers
Location: Toronto, Ontario
Country: Canada
Start Date: May 12, 1986
End Date: May 15, 1986
Accession Number
86N31889
Funding Number(s)
PROJECT: RTOP 505-62-51
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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