Gurugubelli, Ravi C. and Balla, Vamsi Krishna and Rajasekaran, B. and Krishna, Prasad and Bontha, Srikanth (2024) Laser directed energy deposited Ti-48Al-2Cr-2Nb alloy: An investigation of high temperature oxidation behavior. Materials Letters, 361. ISSN 0167-577X

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Abstract

This study investigates high-temperature oxidation behavior and kinetics of Laser Directed Energy Deposited (LDED) Ti-48Al-2Cr-2Nb (Ti-48-2-2) alloy at 750 degrees C, 850 degrees C, and 950 degrees C, for 30, 60 and 100 h. Results reveal that the oxide-scale consists of alternating bands of TiO2 and Al2O3 and its stability is strongly dependent on the oxidation temperature and duration. At 850 degrees C and 950 degrees C, the oxide-scale delaminated following 100-h exposure. LDED Ti-48-2-2 exhibited an oxidation rate constant of 0.984 mg(2) cm(-4) h(-1) at 850 degrees C (100 h) and 2.09 mg(2) cm(-4) h(-1) at 950 degrees C (100 h), and an activation energy of 83.7 kJ mol(-1) (850 degrees-950 degrees C). LDED Ti-48-2-2 exhibited poor oxidation resistance compared to conventionally processed Y-TiAl alloys. This can be attributed to the absence of N-rich layer and the typical nano-scale alpha(2)/gamma banded lamellar microstructure observed in other processing routes. Post-process heat treatments can be utilized to obtain the desired microstructural features.

Item Type:	Article
Subjects:	Basic Science Crystal Chemistry, Thermodynamics, Phase Equilibria
Divisions:	Bioceramics & Coating
Depositing User:	Ms Upasana Sahu
Date Deposited:	21 May 2024 05:55
Last Modified:	21 May 2024 05:55
URI:	http://cgcri.csircentral.net/id/eprint/5714

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