Abstract
Step rolling can be used to mass-produce ultrafine-grained (UFG) Ti-6Al-4V sheets. This study clarified the effect of subsequent annealing on the tensile properties of step-rolled Ti-6Al-4V at room temperature (RT) and elevated temperature. The step-rolled alloy retained its UFG structure after subsequent annealing at 500–600 °C. The RT ductility of the step-rolled alloy increased regardless of annealing temperature, but strengthening was only attained by annealing at 500 °C. In contrast, subsequent annealing rarely improved the elevated-temperature tensile properties. The step-rolled Ti-6Al-4V alloy without the annealing showed the highest elongation to failure of 960% at 700 °C and a strain rate of 10−3 s−1. The ambivalent effect of annealing on RT and elevated-temperature tensile properties is a result of microstructural features, such as dislocation tangles, subgrains, phases, and continuous dynamic recrystallization.
Highlights
Ti-6Al-4V alloy is widely used in aerospace industries due to its high specific strength, excellent corrosion resistance, and high service temperature [1]
EL at elevated temperatures was affected by strain rate, deformation temperature, and type of sample (Figure 5)
This study investigated the room temperature (RT) and elevated-temperature deformation behaviors of UFG Ti-6Al-4V
Summary
Ti-6Al-4V alloy is widely used in aerospace industries due to its high specific strength, excellent corrosion resistance, and high service temperature [1]. Many complicated aircraft structures are manufactured from Ti-6Al-4V alloys, using superplastic forming to reduce the material’s weight for cost saving [2] This process is typically performed at relatively high temperatures of over 850 ◦ C and low strain rates of less than 10−3 s−1 ; these processes are expensive, so they increase production cost. The grains of Ti-6Al-4V alloy have been reduced to a size variety of severe plastic deformation (SPD) processes, such as equal-channel angular pressing (ECAP). Formability of the rolling materialsuppresses so that thegrain plategrowth can be rolled at progressively lower temperatures in low-temperature and thereby achieves significant grain refinement subsequent rolling passes This low-temperature rolling suppresses grain growth and thereby with a relatively low amount of plastic strain [12]. Room temperature and elevated temperatures under a range of ε
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