High-strength, high-plasticity and high-toughness titanium alloy material based on microalloying and preparation method thereof

Abstract

According to the high-strength, high-plasticity and high-toughness titanium alloy material based on microalloying, the chain action of beta-phase stability regulation, structure refinement, brittle phase inhibition and phase change toughening activation is achieved through Fe-Mo-Cr microalloying, and deep coupling is formed with forging, rolling and solid solution aging in the preparation process; on the premise that plasticity and toughness are not sacrificed, synergistic improvement of strength, plasticity and toughness of the titanium alloy is achieved through a multi-stage mechanism of solid solution strengthening, fine grain strengthening, precipitation strengthening and a TRIP effect, the strength is improved to 1000 MPa or above through the synergistic effect of Fe, Cr and Mo on the basis that the original advantages of TC4 alloy are kept, meanwhile, it is ensured that the ductility is larger than or equal to 15%, and the fracture toughness is larger than or equal to 90 MPa.m < 1 / 2 >; and a core material with high performance and economical efficiency is provided for deep sea equipment.

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