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Investigation of Mechanisms of Blade Failure of Forged Hastalloy B and Cast Stellite 21 Turbine Blades in Turbojet EngineAn investigation was conducted to study the mechanisms of blade failure of forged Hastelloy B and cast Stellite 21. The blades were mounted in a 16-25-6 alloy rotor and subjected to 20-minute cycles consisting of 15 minutes at rated speed and approximately 5 minutes at idle. The first failures of the Hastelloy B and Stellite 21 blades were probably the result of excessive vibratory stresses and occurred after 14.25 and 16.75 hours, respectively. After 28.75 hours of operation, all but 3 of the original 25 Hastelloy B blades had either failed or contained stress-rupture-type cracks and four of the original 27 Stellite 21 blades contained stress-rupture-type cracks.
Document ID
19930086629
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Yaker, C
Robards, C F
Garrett, F B
Date Acquired
August 16, 2013
Publication Date
August 22, 1951
Report/Patent Number
NACA-RM-E51D16
Accession Number
93R15919
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
ENGINES, TURBO-JET
TURBINES - STRESS AND VIBRATION
ALLOYS, HEAT-RESISTING

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