Enhancement of the Strength and the Corrosion Resistance of a PT-7M Titanium Alloy Using Rotary Forging

• Published in: Russian metallurgy Metally Vol. 2021; no. 5; pp. 600 - 610
• Main Authors: Chuvil’deev, V. N., Kopylov, V. I., Nokhrin, A. V., Bakhmet’ev, A. M., Tryaev, P. V., Tabachkova, N. Yu, Chegurov, M. K., Kozlova, N. A., Mikhailov, A. S., Ershova, A. V., Gryaznov, M. Yu, Shadrina, Ya. S., Likhnitskii, K. V., Stepanov, S. P., Myshlyaev, M. M.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-05-2021; Springer Nature B.V
• Subjects: Alloying elements; Aluminum; Chemistry and Materials Science; Corrosion effects; Corrosion resistance; Corrosion resistant alloys; Crystal lattices; Deformation effects; Forging; Grain boundaries; Materials Science; Mechanical properties; Metallic Materials; Pitting (corrosion); Plastic deformation; Recrystallization; Titanium alloys; Titanium base alloys; titanium alloy; fine-grained structure; strength; grain boundaries; rotary forging; corrosion resistance
• ISSN: 0036-0295; 1555-6255; 1531-8648
• DOI: 10.1134/S0036029521050050

The effect of severe plastic deformation by rotary forging on the mechanical properties and the corrosion resistance of a pseudo-α-titanium PT-7M alloy is studied. The corrosive character of fracture the fine-grained alloy under hot salt corrosion (HSC) conditions is found to change: pitting corrosion at the onset of recrystallization processes changes into intercrystalline corrosion. The HSC resistance of the fine-grained PT-7M titanium alloy is shown to depend on the structure–phase state of grain boundaries, whose intense migration with developing recrystallization leads to “sweeping out” of corrosion-hazardous alloying elements (aluminum, zirconium) from the crystal lattice of the titanium alloy.