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The beta gamma alloys of Ti 43.8Al 4Nb 2Cr 0.2B 0.2C at % (9CN) were prepared using induction skull melted (ISM) cast ingots. In order to make a fine fully lamellar structure with some minor phases, two step cooling was performed using two furnaces after heat treatments in the α + β phase region. The heat-treatments produced an ~50 μm fully lamellar structure with α2 / γ + γ + B2 (HIP) → α + β (heating) → α / γ (FL) + γ + B2 → α2 / γ (FL) + γ + B2 phase change. For the two step heat treatment, the specimen was heat treated at 1340 C(or 1350 C) and transferred to another furnace, which was maintained at 950 C, in order to minimize any phase transformations between the temperatures. Fully lamellar specimens with some phases were compression-tested at RT, 700 C, 800 C, 900 C and 1000 C, and showed excellent compressive strength at high temperature. The resultant material property determined via this cooling process was superior to that of other materials such as Ni based superalloys or commercial TiAl alloys. The microstructures associated with the cooling effect were discussed in terms of materials properties and phase transformation. (Received November 29, 2017; Accepted February 19, 2018)

Microstructural Evolution in Cast and HIP’ed Ingot Material of Beta Gamma TiAl Alloy by Two Step Cooling