Research shows aging at 500°C decreases static crack resistance in titanium alloy, suggesting optimal quenching modes.
The mechanical properties and structure of (α + β) - titanium alloy VT23 have been studied after various modes of quenching and hardening aging. It is shown that aging at 500 °C for 8 h reduces the index of static crack resistance of the alloy quenched from 800 or 860 °C by factors of 1.4 and 2.4, respectively. The highest complex of strength properties and static crack resistance (σ0.2 = 1130 MPa, σt = 1252 MPa, K1c = 39.2 MPa m1 / 2) while maintaining a sufficient structural strength margin T = 44.4·103 MPa2·m1 / 2 is achieved after quenching from 800 °C and subsequent aging at 500 °C for 8 h. The evolution regularities of the phase composition and structure of the alloy depending on the modes of heat treatment were established. Features of the macro- and microstructure of fractures in compact tension (CT) specimens after tests for static crack resistance were determined.
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Gladkovsky et al. (2022) studied this question.
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