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The current trend in the aerospace industry toward larger and fewer engines per aircraft has resulted in new demands in gas turbine materials. GTD-222, a new alloy selected for combustion casings due to its excellent elevated temperature properties, was evaluated to determine the potential effects of chemistry and conventional processing techniques (VIM+VAR) on the alloy’s microstructural response and mechanical properties. It was concluded that homogenization processing was not a major contributor to improvements in elevated temperature properties. An increase in tensile properties was achieved with a solution heat treatment below the M,,C6 solvus temperature. Stress rupture life and ductility were improved with increasing carbon content. In addition, increasing carbon content reduced the solidus and gamma-prime solvus temperatures and yielded a finer primary microstructure. It was concluded that reforging stock could be produced by VIM+VAR processing the alloy.

The Effects of Ingot Composition and Conversion on the Mechanical Properties and Microstructural Response of GTD-222