Effect of multi-pass deformation on microstructure and flow behavior of Ti-6Al-4V alloy fabricated through hot isostatic pressing
Ti-6Al-4V titanium alloy specimens fabricated through hot isostatic pressing (HIP) were made by multi-pass thermal deformation. The temperature was 950 °C, 850 °C and 900 °C for one pass, two passes and three passes, respectively, and each pass corresponded to three strain rate (i.e. 0.01 s ^−1 , 0....
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2021-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/abd8a0 |
| _version_ | 1797746798473773056 |
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| author | Jishi Zhang Haijun Liu Kaihua Xu Zhimin Zhang Qiang Wang Yong Xue |
| author_facet | Jishi Zhang Haijun Liu Kaihua Xu Zhimin Zhang Qiang Wang Yong Xue |
| author_sort | Jishi Zhang |
| collection | DOAJ |
| description | Ti-6Al-4V titanium alloy specimens fabricated through hot isostatic pressing (HIP) were made by multi-pass thermal deformation. The temperature was 950 °C, 850 °C and 900 °C for one pass, two passes and three passes, respectively, and each pass corresponded to three strain rate (i.e. 0.01 s ^−1 , 0.1 s ^−1 and 1 s ^−1 ), in addition, the total reduction in height was 70%. When the true strain was greater than 0.51 and the strain rate was 1 s ^−1 , the stress-strain curves showed the phenomenon of flow softening. X-ray diffraction (XRD) patterns indicated that the diffraction peak of α lattice plane of (0002) increased first and then declined with the strain under the strain rate of 0.1 s ^−1 . Besides, the Vickers hardness increased with the strain at the same strain rate and was not sensitive to strain rate. Moreover, when the strain rate was 0.1 s ^−1 , the fraction of LAGBs decreased from two passes to three passes and the microstructure results showed that the fraction of equiaxed α phases increased with the passes increasing. This is due to the strain energy increased as the increasing passes which could provide driving force for dynamic recrystallization (DRX). At the same amount of deformation, increasing the strain rate, the slender lamellar α bended and the equiaxed α grains gradually took place of the discontinuous lamellar α . Additionally, the spheroidization mechanism of lamellar α phase was mainly through grain boundaries bulging. After completing three passes deformation, the average grain size was approximately 12 μ m. |
| first_indexed | 2024-03-12T15:41:55Z |
| format | Article |
| id | doaj.art-2daace7c2714460599b2e1651dc2a4ce |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:41:55Z |
| publishDate | 2021-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-2daace7c2714460599b2e1651dc2a4ce2023-08-09T15:54:51ZengIOP PublishingMaterials Research Express2053-15912021-01-018101651910.1088/2053-1591/abd8a0Effect of multi-pass deformation on microstructure and flow behavior of Ti-6Al-4V alloy fabricated through hot isostatic pressingJishi Zhang0Haijun Liu1Kaihua Xu2Zhimin Zhang3Qiang Wang4Yong Xue5https://orcid.org/0000-0002-1516-3035College of Material Science and Engineering, North University of China , Taiyuan, 030051, People’s Republic of ChinaCollege of Material Science and Engineering, North University of China , Taiyuan, 030051, People’s Republic of ChinaCollege of Material Science and Engineering, North University of China , Taiyuan, 030051, People’s Republic of ChinaCollege of Material Science and Engineering, North University of China , Taiyuan, 030051, People’s Republic of ChinaCollege of Material Science and Engineering, North University of China , Taiyuan, 030051, People’s Republic of ChinaCollege of Material Science and Engineering, North University of China , Taiyuan, 030051, People’s Republic of ChinaTi-6Al-4V titanium alloy specimens fabricated through hot isostatic pressing (HIP) were made by multi-pass thermal deformation. The temperature was 950 °C, 850 °C and 900 °C for one pass, two passes and three passes, respectively, and each pass corresponded to three strain rate (i.e. 0.01 s ^−1 , 0.1 s ^−1 and 1 s ^−1 ), in addition, the total reduction in height was 70%. When the true strain was greater than 0.51 and the strain rate was 1 s ^−1 , the stress-strain curves showed the phenomenon of flow softening. X-ray diffraction (XRD) patterns indicated that the diffraction peak of α lattice plane of (0002) increased first and then declined with the strain under the strain rate of 0.1 s ^−1 . Besides, the Vickers hardness increased with the strain at the same strain rate and was not sensitive to strain rate. Moreover, when the strain rate was 0.1 s ^−1 , the fraction of LAGBs decreased from two passes to three passes and the microstructure results showed that the fraction of equiaxed α phases increased with the passes increasing. This is due to the strain energy increased as the increasing passes which could provide driving force for dynamic recrystallization (DRX). At the same amount of deformation, increasing the strain rate, the slender lamellar α bended and the equiaxed α grains gradually took place of the discontinuous lamellar α . Additionally, the spheroidization mechanism of lamellar α phase was mainly through grain boundaries bulging. After completing three passes deformation, the average grain size was approximately 12 μ m.https://doi.org/10.1088/2053-1591/abd8a0microstructureTi-6Al-4V alloyhot isostatic pressingmulti-pass deformation |
| spellingShingle | Jishi Zhang Haijun Liu Kaihua Xu Zhimin Zhang Qiang Wang Yong Xue Effect of multi-pass deformation on microstructure and flow behavior of Ti-6Al-4V alloy fabricated through hot isostatic pressing Materials Research Express microstructure Ti-6Al-4V alloy hot isostatic pressing multi-pass deformation |
| title | Effect of multi-pass deformation on microstructure and flow behavior of Ti-6Al-4V alloy fabricated through hot isostatic pressing |
| title_full | Effect of multi-pass deformation on microstructure and flow behavior of Ti-6Al-4V alloy fabricated through hot isostatic pressing |
| title_fullStr | Effect of multi-pass deformation on microstructure and flow behavior of Ti-6Al-4V alloy fabricated through hot isostatic pressing |
| title_full_unstemmed | Effect of multi-pass deformation on microstructure and flow behavior of Ti-6Al-4V alloy fabricated through hot isostatic pressing |
| title_short | Effect of multi-pass deformation on microstructure and flow behavior of Ti-6Al-4V alloy fabricated through hot isostatic pressing |
| title_sort | effect of multi pass deformation on microstructure and flow behavior of ti 6al 4v alloy fabricated through hot isostatic pressing |
| topic | microstructure Ti-6Al-4V alloy hot isostatic pressing multi-pass deformation |
| url | https://doi.org/10.1088/2053-1591/abd8a0 |
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