Microstructural Variation and a Physical Mechanism Model for a Ti-55511 Alloy during Double-Stage Hot Deformation with Stepped Strain Rates in the β Region
The microstructural variation and high-temperature flow features of a Ti-55511 alloy in the β region are studied by utilizing double-stage compression with a stepped strain rate. The results demonstrate that the stresses in the latter stage of hot compression markedly reduce as the strain at the pre...
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oai:doaj.org-article:6394eb390a574e628bcf00611ef40e172021-11-11T17:56:27ZMicrostructural Variation and a Physical Mechanism Model for a Ti-55511 Alloy during Double-Stage Hot Deformation with Stepped Strain Rates in the β Region10.3390/ma142163711996-1944https://doaj.org/article/6394eb390a574e628bcf00611ef40e172021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6371https://doaj.org/toc/1996-1944The microstructural variation and high-temperature flow features of a Ti-55511 alloy in the β region are studied by utilizing double-stage compression with a stepped strain rate. The results demonstrate that the stresses in the latter stage of hot compression markedly reduce as the strain at the previous stage or the strain rate at the previous/latter stage drops. Moreover, the annihilation/interaction of substructures is promoted, and the distinct refinement of the dynamic recrystallization (DRX) in the β grain can be found. However, the coarsening of the β grain and the consumption of dislocation substructures are accelerated at high temperatures. Furthermore, the principal DRX nucleation mechanism of the Ti-55511 alloy during double-stage compression with a stepped strain rate in the β region is discontinuous DRX. Additionally, by using the microstructural variation characteristics related to the forming parameters, a physical mechanism equation is modeled to forecast the forming features, the DRX fraction, and the size of the β grain in the investigated alloy. The forecasted results are in accordance with the tested results, indicating that the established model can accurately forecast the microstructure variation and flow features of the studied alloy.Dao-Guang HeGang SuYong-Cheng LinYu-Qiang JiangZhou LiZi-Jian ChenXin-Tao YanYu-Chi XiaYang-Chen XieMDPI AGarticlehot deformationconstitutive modelmicrostructural changetitanium alloyTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6371, p 6371 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
hot deformation constitutive model microstructural change titanium alloy Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
| spellingShingle |
hot deformation constitutive model microstructural change titanium alloy Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Dao-Guang He Gang Su Yong-Cheng Lin Yu-Qiang Jiang Zhou Li Zi-Jian Chen Xin-Tao Yan Yu-Chi Xia Yang-Chen Xie Microstructural Variation and a Physical Mechanism Model for a Ti-55511 Alloy during Double-Stage Hot Deformation with Stepped Strain Rates in the β Region |
| description |
The microstructural variation and high-temperature flow features of a Ti-55511 alloy in the β region are studied by utilizing double-stage compression with a stepped strain rate. The results demonstrate that the stresses in the latter stage of hot compression markedly reduce as the strain at the previous stage or the strain rate at the previous/latter stage drops. Moreover, the annihilation/interaction of substructures is promoted, and the distinct refinement of the dynamic recrystallization (DRX) in the β grain can be found. However, the coarsening of the β grain and the consumption of dislocation substructures are accelerated at high temperatures. Furthermore, the principal DRX nucleation mechanism of the Ti-55511 alloy during double-stage compression with a stepped strain rate in the β region is discontinuous DRX. Additionally, by using the microstructural variation characteristics related to the forming parameters, a physical mechanism equation is modeled to forecast the forming features, the DRX fraction, and the size of the β grain in the investigated alloy. The forecasted results are in accordance with the tested results, indicating that the established model can accurately forecast the microstructure variation and flow features of the studied alloy. |
| format |
article |
| author |
Dao-Guang He Gang Su Yong-Cheng Lin Yu-Qiang Jiang Zhou Li Zi-Jian Chen Xin-Tao Yan Yu-Chi Xia Yang-Chen Xie |
| author_facet |
Dao-Guang He Gang Su Yong-Cheng Lin Yu-Qiang Jiang Zhou Li Zi-Jian Chen Xin-Tao Yan Yu-Chi Xia Yang-Chen Xie |
| author_sort |
Dao-Guang He |
| title |
Microstructural Variation and a Physical Mechanism Model for a Ti-55511 Alloy during Double-Stage Hot Deformation with Stepped Strain Rates in the β Region |
| title_short |
Microstructural Variation and a Physical Mechanism Model for a Ti-55511 Alloy during Double-Stage Hot Deformation with Stepped Strain Rates in the β Region |
| title_full |
Microstructural Variation and a Physical Mechanism Model for a Ti-55511 Alloy during Double-Stage Hot Deformation with Stepped Strain Rates in the β Region |
| title_fullStr |
Microstructural Variation and a Physical Mechanism Model for a Ti-55511 Alloy during Double-Stage Hot Deformation with Stepped Strain Rates in the β Region |
| title_full_unstemmed |
Microstructural Variation and a Physical Mechanism Model for a Ti-55511 Alloy during Double-Stage Hot Deformation with Stepped Strain Rates in the β Region |
| title_sort |
microstructural variation and a physical mechanism model for a ti-55511 alloy during double-stage hot deformation with stepped strain rates in the β region |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/6394eb390a574e628bcf00611ef40e17 |
| work_keys_str_mv |
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