Abstract
We proposed a method for the treatment of VT9 alloy, which increases its conventional yield strength by 25% and ultimate strength by 15% at 400-550°C as compared with the traditional strengthening treatment. This method consists of the saturation of blanks with hydrogen, and their deformation, quenching, aging, and dehydrogenating vacuum annealing. Since the growth of strength characteristics is connected with the formation of a special structural state in the alloy, we describe the results of its investigation after each stage of treatment. In this alloy, one can obtain a fine-grained lamellar microstructure with a size of β-grains of 20 to 40 μm and the α-phase, whose composition is close to ordered Ti 3 Al intermetallic compound. The structural state and properties of the alloy remain invariable after its additional holding at 500°C for 100 h.
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