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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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Autores principales: He, Dao-Guang, Su, Gang, Lin, Yong-Cheng, Jiang, Yu-Qiang, Li, Zhou, Chen, Zi-Jian, Yan, Xin-Tao, Xia, Yu-Chi, Xie, Yang-Chen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585474/
https://www.ncbi.nlm.nih.gov/pubmed/34771895
http://dx.doi.org/10.3390/ma14216371
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author He, Dao-Guang
Su, Gang
Lin, Yong-Cheng
Jiang, Yu-Qiang
Li, Zhou
Chen, Zi-Jian
Yan, Xin-Tao
Xia, Yu-Chi
Xie, Yang-Chen
author_facet He, Dao-Guang
Su, Gang
Lin, Yong-Cheng
Jiang, Yu-Qiang
Li, Zhou
Chen, Zi-Jian
Yan, Xin-Tao
Xia, Yu-Chi
Xie, Yang-Chen
author_sort He, Dao-Guang
collection PubMed
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.
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spelling pubmed-85854742021-11-12 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 He, Dao-Guang Su, Gang Lin, Yong-Cheng Jiang, Yu-Qiang Li, Zhou Chen, Zi-Jian Yan, Xin-Tao Xia, Yu-Chi Xie, Yang-Chen Materials (Basel) Article 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. MDPI 2021-10-25 /pmc/articles/PMC8585474/ /pubmed/34771895 http://dx.doi.org/10.3390/ma14216371 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
He, Dao-Guang
Su, Gang
Lin, Yong-Cheng
Jiang, Yu-Qiang
Li, Zhou
Chen, Zi-Jian
Yan, Xin-Tao
Xia, Yu-Chi
Xie, Yang-Chen
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 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_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_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
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585474/
https://www.ncbi.nlm.nih.gov/pubmed/34771895
http://dx.doi.org/10.3390/ma14216371
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