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Effect of Aging Applied with the Ultra-Low Heating Rate after CRYO Treatment on the Corrosion Resistance of Metastable β Titanium Alloy’s

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Abstract

Metastable β titanium alloys were used in the aviation field in the first years of their discovery because of their high strength versus low density, providing fuel savings. However, studies conducted in recent years show that the usage areas of metastable alloys will increase owing to their unique properties, such as high heat treatment efficiency. In this study, corrosion resistance of Ti–15V–3Al–3Sn–3Cr alloy was investigated by applying single-step, duplex aging, and cryogenic treatment to the alloy separately or consecutively. The alloy was heated with an ultra-low heating rate of 0.2°C/min to aging treatment temperature to allow the formation of metastable phases. The cryogenic treatment was applied at –196°C for 24 hours, the single-step aging was conducted at 500°C for 6 hours, and the duplex aging treatments were applied for 24 hours at 250°C followed by 6 hours at 500°C. The corrosion behavior of samples treated at different temperatures was also investigated by Tafel extrapolation and linear polarization methods in 0.9% NaCl solutions at 37°C and 3.5% NaCl solutions at 25°C. The thinnest α phases (width and length 40 ± 7 nm by 170 ± 15 nm, respectively) and the highest microhardness (as 446 HV) were measured in the cryo treated plus duplex aged sample. While the corrosion resistance of the solution-treated Ti–15V–3Al–3Sn–3Cr alloy was highest in both environments, the corrosion resistance decreased with the applied heat treatments.

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Yumak, N., Kayali, Y. Effect of Aging Applied with the Ultra-Low Heating Rate after CRYO Treatment on the Corrosion Resistance of Metastable β Titanium Alloy’s. Phys. Metals Metallogr. 123, 1436–1442 (2022). https://doi.org/10.1134/S0031918X22100052

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