Development of a Very High Strength Disk Alloy for L400F Service.
Final technical rept. 30 Jun 72-30 Jun 74,
GENERAL ELECTRIC CO CINCINNATI OHIO AIRCRAFT ENGINE GROUP
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The primary objective of the program was to develop an advanced powder metallurgy disk alloy for 1400F service which combined high tensile and creep rupture properties with exceptional low cycle fatigue strength. A three phase experimental program was designed to accomplish this goal. Preliminary studies were conducted prior to initiation of Phase I to identify seven alloyprocess combinations to be evaluated in Phase I. Mechanical property screening tests were conducted on subscale disks during Phase I in order to define one alloyprocess combination for scale-up in Phase II. On the basis of Phase I results, an alloy designated AF-115 was identified which easily exceeded program low cycle fatigue goals and nearly met all program tensile and creep rupture goals. Analysis of AF-115 during Phase II verified that the excellent mechanical properties produced during Phase I could also be achieved in larger disk forgings. Phase III of the program consisted of a cursory alloy development effort directed at exploring the potential of relatively low density superalloys.
- Metallurgy and Metallography
- Jet and Gas Turbine Engines