Enhancing the creep resistance of electron beam melted gamma Ti-48Al-2Cr-2Nb alloy by using two-step heat treatment

초록

Electron beam melted Ti-48Al-2Cr-2Nb alloy has undesirable creep resistance due to a near-gamma structure that is not proper for creep. We aimed to control the microstructure of EBM-built Ti-48Al-2Cr-2Nb using two-step heat treatment to improve the high-temperature (750 degrees C) creep resistance while also maintaining room-temperature ductility. As a result of two-step heat treatment, heat-treated EBM-built Ti-48Al-2r-2Nb alloy has a nearly lamellar microstructure with a thin lamellar structure and fine equiaxed gamma grains. High-temperature creep resistance was significantly improved after two-step heat treatment by inducing a thin lamellar structure. Room temperature ductility was also maintained even while containing a lamellar structure.

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