Abstract
A self-designed Ti-35421 (Ti-3Al-5Mo-4Cr-2Zr-1Fe wt%) titanium alloy is a new type of low-cost high strength titanium alloy. In order to understand the hot deformation behavior of Ti-35421 alloy, isothermal compression tests were carried out under a deformation temperature range of 750–930 °C with a strain rate range of 0.01–10 s−1 in this study. Electron backscatter diffraction (EBSD) was used to characterize the microstructure prior to and post hot deformation. The results show that the stress–strain curves have obvious yielding behavior at a high strain rate (>0.1 s−1). As the deformation temperature increases and the strain rate decreases, the α phase content gradually decreases in the α + β phase region. Meanwhile, spheroidization and precipitation of α phase are prone to occur in the α + β phase region. From the EBSD analysis, the volume fraction of recrystallized grains was very low, so dynamic recovery (DRV) is the dominant deformation mechanism of Ti-35421 alloy. In addition to DRV, Ti-35421 alloy is more likely to occur in continuous dynamic recrystallization (CDRX) than discontinuous dynamic recrystallization (DDRX).
Highlights
Near-β titanium alloys have excellent mechanical properties and corrosion resistance, which are very suitable for large load-bearing material [1,2,3]
The effect of elements on the stability of the beta phase for titanium alloys can be measured by the Mo equivalent equation [Mo] [21]
When [Mo]eq is over 10, the high-temperature stable β phase of the titanium alloy can be completely maintained at room temperature after solution-treatment with rapid cooling
Summary
Near-β titanium alloys have excellent mechanical properties and corrosion resistance, which are very suitable for large load-bearing material [1,2,3]. Such alloys are widely used in aerospace and marine engineering. V is expensive and causes environmental pollution problems during manufacturing. To solve this problem, great efforts have been made to replace V by other low-cost alloy elements while maintaining or even improving the strength, flexibility, and fracture toughness of the primary alloys. Titanium alloys with added content of Fe have been reported, such as Ti-5Al-2.5Fe alloy, Ti-6Al-5Fe-0.05B-0.05C alloy [3,8,9,10,11]
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