ODS FeCrAlY Component Manufacturing Development.
Final rept. 22 Mar 72-22 Mar 73,
GENERAL ELECTRIC CO CINCINNATI OHIO MATERIAL AND PROCESS TECHNOLOGY LABS
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Process parameters were established for the fabrication of ODS FeCrAlY first stage nozzle vane material through a pilot manufacturing study and was then successfully scaled-up to full size vane blanks. Argon atomized powders were uniformly preoxidized and extruded using a modified SAP approach. Exaggerated grain growth was achieved for improved high temperature strength properties through thermomechanical processing by isothermal forging and directional recrystallization techniques. The rupture strength goal was met. The vane blanks were determined to possess a duplex crystallographic orientation of 211 and 111. The 001 orientation was the sought after direction because of the low modulus of elasticity for improved thermal fatigue resistance. The high modulus orientations have serious implications for thermal fatigue resistance. A study for the modification of crystallographic orientation was initiated. A first stage nozzle vane has been designed for the testing of ODS FeCrAlY in a TF-34 engine at skin temperatures in excess of 2100F. Modified author abstract
- Metallurgy and Metallography