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Open AccessArticle

Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained Structure

1
Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
2
School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
3
Center for Advanced Aerospace Materials, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
4
Advanced Metals Division, Korea Institute of Materials Science, Changwon 51508, Korea
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(5), 684; https://doi.org/10.3390/met10050684
Received: 23 April 2020 / Revised: 15 May 2020 / Accepted: 21 May 2020 / Published: 22 May 2020
(This article belongs to the Special Issue Titanium Alloys and Titanium-Based Matrix Composites)
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. View Full-Text
Keywords: Ti-6Al-4V; step rolling; grain refinement; superplasticity; continuous dynamic recrystallization Ti-6Al-4V; step rolling; grain refinement; superplasticity; continuous dynamic recrystallization
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Kim, G.; Lee, T.; Lee, Y.; Kim, J.N.; Choi, S.W.; Hong, J.K.; Lee, C.S. Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained Structure. Metals 2020, 10, 684.

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