Microstructure Evolution and a Unified Constitutive Model of Ti-55511 Alloy Compressed at Stepped Strain Rates

The flow behavior and microstructure change of the Ti-55511 alloy are investigated by thermal compression experiments with stepped strain rates. The phase transformation features, the dynamic recrystallization (DRX) behavior of the β matrix, the dynamic spheroidization mechanism of the lamellar α ph...

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Published inMaterials Vol. 14; no. 22; p. 6750
Main Authors Su, Gang, Yun, Zhong, Lin, Yong-Cheng, He, Dao-Guang, Zhang, Song, Chen, Zi-Jian
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 09.11.2021
MDPI
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ISSN1996-1944
1996-1944
DOI10.3390/ma14226750

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Abstract The flow behavior and microstructure change of the Ti-55511 alloy are investigated by thermal compression experiments with stepped strain rates. The phase transformation features, the dynamic recrystallization (DRX) behavior of the β matrix, the dynamic spheroidization mechanism of the lamellar α phase and the evolution of the β sub-grain size are quantitatively analyzed. A unified constitutive model is constructed to characterize the hot deformation features of the Ti-55511 alloy. In the established model, the work hardening effect is taken into account by involving the coupled effects of the equiaxed and lamellar α phases, as well as β substructures. The dynamic softening mechanisms including the dynamic recovery (DRV), DRX and dynamic spheroidization mechanisms are also considered. The material parameters are optimized by the multi-objective algorithm in the MATLAB toolbox. The consistency between the predicted and experimental data indicates that the developed unified model can accurately describe the flow features and microstructure evolution of the hot compressed Ti-55511 at stepped strain rates.
AbstractList The flow behavior and microstructure change of the Ti-55511 alloy are investigated by thermal compression experiments with stepped strain rates. The phase transformation features, the dynamic recrystallization (DRX) behavior of the β matrix, the dynamic spheroidization mechanism of the lamellar α phase and the evolution of the β sub-grain size are quantitatively analyzed. A unified constitutive model is constructed to characterize the hot deformation features of the Ti-55511 alloy. In the established model, the work hardening effect is taken into account by involving the coupled effects of the equiaxed and lamellar α phases, as well as β substructures. The dynamic softening mechanisms including the dynamic recovery (DRV), DRX and dynamic spheroidization mechanisms are also considered. The material parameters are optimized by the multi-objective algorithm in the MATLAB toolbox. The consistency between the predicted and experimental data indicates that the developed unified model can accurately describe the flow features and microstructure evolution of the hot compressed Ti-55511 at stepped strain rates.
The flow behavior and microstructure change of the Ti-55511 alloy are investigated by thermal compression experiments with stepped strain rates. The phase transformation features, the dynamic recrystallization (DRX) behavior of the β matrix, the dynamic spheroidization mechanism of the lamellar α phase and the evolution of the β sub-grain size are quantitatively analyzed. A unified constitutive model is constructed to characterize the hot deformation features of the Ti-55511 alloy. In the established model, the work hardening effect is taken into account by involving the coupled effects of the equiaxed and lamellar α phases, as well as β substructures. The dynamic softening mechanisms including the dynamic recovery (DRV), DRX and dynamic spheroidization mechanisms are also considered. The material parameters are optimized by the multi-objective algorithm in the MATLAB toolbox. The consistency between the predicted and experimental data indicates that the developed unified model can accurately describe the flow features and microstructure evolution of the hot compressed Ti-55511 at stepped strain rates.The flow behavior and microstructure change of the Ti-55511 alloy are investigated by thermal compression experiments with stepped strain rates. The phase transformation features, the dynamic recrystallization (DRX) behavior of the β matrix, the dynamic spheroidization mechanism of the lamellar α phase and the evolution of the β sub-grain size are quantitatively analyzed. A unified constitutive model is constructed to characterize the hot deformation features of the Ti-55511 alloy. In the established model, the work hardening effect is taken into account by involving the coupled effects of the equiaxed and lamellar α phases, as well as β substructures. The dynamic softening mechanisms including the dynamic recovery (DRV), DRX and dynamic spheroidization mechanisms are also considered. The material parameters are optimized by the multi-objective algorithm in the MATLAB toolbox. The consistency between the predicted and experimental data indicates that the developed unified model can accurately describe the flow features and microstructure evolution of the hot compressed Ti-55511 at stepped strain rates.
Author Zhang, Song
Lin, Yong-Cheng
He, Dao-Guang
Chen, Zi-Jian
Su, Gang
Yun, Zhong
AuthorAffiliation 3 State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China
2 School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; daoguanghe@csu.edu.cn
1 Light Alloy Research Institute, Central South University, Changsha 410083, China; sugang@csu.edu.cn (G.S.); 203801010@csu.edu.cn (S.Z.); zjchen@csu.edu.cn (Z.-J.C.)
AuthorAffiliation_xml – name: 1 Light Alloy Research Institute, Central South University, Changsha 410083, China; sugang@csu.edu.cn (G.S.); 203801010@csu.edu.cn (S.Z.); zjchen@csu.edu.cn (Z.-J.C.)
– name: 3 State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China
– name: 2 School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; daoguanghe@csu.edu.cn
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Snippet The flow behavior and microstructure change of the Ti-55511 alloy are investigated by thermal compression experiments with stepped strain rates. The phase...
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SubjectTerms Algorithms
Artificial intelligence
Aviation
Constitutive models
Deformation
Ductility
Dynamic recrystallization
Evolution
Experiments
Grain size
Mathematical models
Microstructure
Multiple objective analysis
Neural networks
Phase transitions
Spheroidizing
Temperature
Titanium alloys
Titanium base alloys
Work hardening
Title Microstructure Evolution and a Unified Constitutive Model of Ti-55511 Alloy Compressed at Stepped Strain Rates
URI https://www.proquest.com/docview/2602102961
https://www.proquest.com/docview/2604022155
https://pubmed.ncbi.nlm.nih.gov/PMC8623177
Volume 14
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