Abstract
In this study, the effects of various heat treatment procedures on the mechanical properties of the Ti-15V-3Al-3Sn-3Cr metastable β titanium alloy were investigated. Single-step and duplex aging treatments were applied to the alloy at low and high aging temperatures. Duplex aging treatments were carried out by selecting two different pre-aging times and temperatures: 10 h at 300 °C and 24 h at 250 °C. Thus, the effects of pre-aging on the mechanical properties of the alloy were examined. Optimum tensile properties were obtained in the duplex-aged samples, which was aged at 550 °C for 20 h after being pre-aged at 250 °C for 24 h. While fine, high volume fraction and uniformly dispersed α phases increased the tensile strength and % elongation of the alloy in the aging treatment, the fatigue crack propagation rate also increased. Also, it was observed that the threshold stress intensity factor range (ΔKth) increased with the aging treatment. While the lowest ΔKth value was obtained at the solution-treated sample, the highest ΔKth value was obtained in the sample to which duplex aging treatment was applied depending on precipitation of fine and high volume fraction of α phases.
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