Open AccessMulti-step wrought processing of TiAl-based alloys
Author(s) -
G.E. Fuchs
Publication year - 1997
Language(s) - English
Resource type - Reports
DOI - 10.2172/319830
Subject(s) - forging , materials science , extrusion , thermomechanical processing , metallurgy , isothermal process , alloy , recrystallization (geology) , microstructure , ultimate tensile strength , tensile testing , fabrication , medicine , paleontology , physics , alternative medicine , pathology , biology , thermodynamics
Wrought processing will likely be needed for fabrication of a variety of TiAl-based alloy structural components. Laboratory and development work has usually relied on one-step forging to produce test material. Attempts to scale-up TiAl-based alloy processing has indicated that multi-step wrought processing is necessary. The purpose of this study was to examine potential multi-step processing routes, such as two-step isothermal forging and extrusion + isothermal forging. The effects of processing (I/M versus P/M), intermediate recrystallization heat treatments and processing route on the tensile and creep properties of Ti-48Al-2Nb-2Cr alloys were examined. The results of the testing were then compared to samples from the same heats of materials processed by one-step routes. Finally, by evaluating the effect of processing on microstructure and properties, optimized and potentially lower cost processing routes could be identified