Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained Structure
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 subs...
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MDPI AG
2020-05-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/5/684 |
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| author | Geonhyeong Kim Taekyung Lee Yongmoon Lee Jae Nam Kim Seong Woo Choi Jae Keun Hong Chong Soo Lee |
| author_facet | Geonhyeong Kim Taekyung Lee Yongmoon Lee Jae Nam Kim Seong Woo Choi Jae Keun Hong Chong Soo Lee |
| author_sort | Geonhyeong Kim |
| collection | DOAJ |
| description | 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<sup>−3</sup> s<sup>−1</sup>. 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. |
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| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T19:40:12Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-edcf36dd13af4f88974bdd9f32eb27712023-11-20T01:23:44ZengMDPI AGMetals2075-47012020-05-0110568410.3390/met10050684Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained StructureGeonhyeong Kim0Taekyung Lee1Yongmoon Lee2Jae Nam Kim3Seong Woo Choi4Jae Keun Hong5Chong Soo Lee6Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang 37673, KoreaSchool of Mechanical Engineering, Pusan National University, Busan 46241, KoreaCenter for Advanced Aerospace Materials, Pohang University of Science and Technology (POSTECH), Pohang 37673, KoreaGraduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang 37673, KoreaAdvanced Metals Division, Korea Institute of Materials Science, Changwon 51508, KoreaAdvanced Metals Division, Korea Institute of Materials Science, Changwon 51508, KoreaGraduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang 37673, KoreaStep 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<sup>−3</sup> s<sup>−1</sup>. 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.https://www.mdpi.com/2075-4701/10/5/684Ti-6Al-4Vstep rollinggrain refinementsuperplasticitycontinuous dynamic recrystallization |
| spellingShingle | Geonhyeong Kim Taekyung Lee Yongmoon Lee Jae Nam Kim Seong Woo Choi Jae Keun Hong Chong Soo Lee Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained Structure Metals Ti-6Al-4V step rolling grain refinement superplasticity continuous dynamic recrystallization |
| title | Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained Structure |
| title_full | Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained Structure |
| title_fullStr | Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained Structure |
| title_full_unstemmed | Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained Structure |
| title_short | Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained Structure |
| title_sort | ambivalent role of annealing in tensile properties of step rolled ti 6al 4v with ultrafine grained structure |
| topic | Ti-6Al-4V step rolling grain refinement superplasticity continuous dynamic recrystallization |
| url | https://www.mdpi.com/2075-4701/10/5/684 |
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