Performance of several cast nickel-base alloys as turbojet-engine bucket materials at 1650° F
James R. Johnston, Charles A. Gyorgak, John H. Sinclair, United States. National Aeronautics and Space Administration
National Aeronautics and Space Administration, 1962 - Technology & Engineering - 36 pages
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20 parts glycerine airfoil alloy groups argon argon-cast Guy alloy argon-cast Udimet 500 as-received buckets bucket fracture bucket lives bucket materials buckets containing buckets that fractured centrifugal stress Distance above base edge Leading edge edge Trailing edge Elongation Measurements engine operating engine was operated Fatigue Cracking fractured buckets Gyorgak heavy scale inch Inconel 7l3 indicated investigation J33 engine J47 engine Johnston l/2-inch gage lengths l00 hours Leading edge Leading Lewis Research Center mechanical fatigue median lives Melted and cast Metallographic Examination Midchord Leading edge midspan bucket temperature NACA NASA alloy buckets Number of buckets observed in buckets obtained Origin of fracture percent rated speed rated-speed conditions resulting from engine S0 D S0 shown in figure Signorelli stress concentrations stress-rupture properties temperature distributions temperature of l650 test was terminated Turbine Buckets turbine-bucket materials turbine-inlet temperature Turbojet Engine Typical microstructures Udimet 500 buckets Vacuum-cast Guy Vacuum-cast Udimet 500 Weeton