Separation of dynamic recrystallization parameter domains from a chaotic system for Ti–6Al–4V alloy and its application in parameter loading path design

Quan, Guo-zheng; Ma, Yaoyao; Zhang, Yuqing; Zhang, Pu; Wang, Weiyong

doi:10.1016/j.msea.2019.138745

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…In Figure 8, point A represents the critical point for the initiation of DRX; point B represents the point of peak stress; and point C represents the point of steady state stress in the ideal DRV-type stress-strain curves. The supposed curve in Figure 8 shows that the work hardening rate θ decreases linearly to zero with the flow stress increasing from the critical stress σ c to the peak stress σ p , and it can be represented as Equation (10):…”

Section: The Kinetics Of Drxmentioning

confidence: 99%

“…As for DRX, it is the dominant grain refinement mechanism, and the microstructures with finer grains contribute to improving the comprehensive properties of materials [6,7]. It is well-accepted that the DRX behaviors are sensitively affected by temperature, strain, and strain rate, and show a complicated nonlinear relationship with the three deformation parameters [8][9][10]. Hence, it is of great significance to accurately describe the DRX behaviors and grain evolution mechanisms for controlling the microstructures in the hot forming process of SAE 5137H steel.…”

Section: Introductionmentioning

confidence: 99%

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Description of Dynamic Recrystallization Behaviors and Grain Evolution Mechanisms during the Hot Forming Process for SAE 5137H Steel

et al. 2022

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Describing the dynamic recrystallization (DRX) behaviors and grain evolution mechanisms in the hot forming process contributes to controlling microstructures and enhancing mechanical properties of materials. Here, the isothermal compression experiments for SAE 5137H steel were conducted under temperatures of 1123–1483 K and strain rates of 0.01–10 s−1. The DRX kinetics models, including DRX volume fraction and grain size models, and the meso-scale cellular automaton (CA) models, were established based on the obtained true stress–strain curves and microstructure observation results. In order to dynamically reveal DRX behaviors and grain morphology evolution, a multi-field and multi-scale coupling finite element (FE) model for the hot compression process was developed by embedding the solved DRX kinetics models and CA models. Results show that the DRX volume fraction and grain size increase with temperature increasing and strain rate decreasing. The DRX grains are easier to nucleate at the initial grain boundaries. As strain increases, DRX grains grow up by devouring the matrix grains until DRX occurs completely. The microstructures after compression are composed of equiaxed DRX grains. Finally, the comparisons of grain size between experimental results and simulation results were performed. The mean relative errors between experimental results and predicted results from DRX kinetics models, and between experimental results and predicted results from CA models, were evaluated as 6.5% and 6.0%, respectively. It proves that the developed FE model can well describe the microstructure evolution in the hot deformation process of SAE 5137H steel.

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Section: The Kinetics Of Drxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Description of Dynamic Recrystallization Behaviors and Grain Evolution Mechanisms during the Hot Forming Process for SAE 5137H Steel

et al. 2022

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“…For SAE 5137H steel, hot working processes such as forging, rolling et al play a crucial role in its industries application. In such hot working processes of steels, the processing parameters including temperature, strain rate, and strain have a significant effect on the microstructures resulting in component mechanical properties [ 2 , 3 ]. By designing the processing parameter loading path from a chaotic system, the microstructural characteristics of steels can be adjusted to improve their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…By designing the processing parameter loading path from a chaotic system, the microstructural characteristics of steels can be adjusted to improve their mechanical properties. To obtain excellent mechanical properties, the uniform and refined microstructures induced by dynamic recrystallization (DRX) are often pursued in hot deformation [ 3 ]. However, it is a crucial issue to acquire the anticipated microstructures and even excellent mechanical properties through the processing parameter loading path design [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Response Surface of Speed-Loading Path to Grain Refinement during Current-Heating Compression at SAE 5137H Steel

Quan

Yang

et al. 2022

Materials

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In thermal deformation of materials, grain refinement induced by dynamic recrystallization (DRX) is often pursued to obtain excellent mechanical properties. Here, the thermal deformation behaviors of SAE 5137H steel were investigated and characterized at temperature and strain rate range of 1123–1483 K and 0.01–10 s−1. Meanwhile, a design approach in speed-loading paths for grain refinement during current-heating compression was proposed, and these paths are linked to a typical three-dimensional (3D) response surface. Depending on the acquired stress–strain curves, the flow behaviors of this steel were analyzed and the typical 3D processing map was constructed to clarify the stable processing parameter domains during the continuous deformation process. Then, by the typical 3D processing map and microstructure observation, the 3D deformation mechanism map was constructed to connect the processing parameters and microstructural mechanisms. Subsequently, the 3D activation energy map was constructed to evaluate these deformation mechanisms, and the enhanced deformation mechanism map was constructed. Eventually, based on the enhanced deformation mechanism map, the speed-loading paths for SAE 5137H steel during current-heating compression were designed and they are mapped in a 3D response surface.

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“…Titanium and its alloys are composed of three structural forms being alpha (α), beta (β), and alpha-beta (α, β). Within the titanium alloy, aluminium is the alpha-phase stabilizer, whereas vanadium is the beta-phase stabilizer [8][9][10][11][12]. Commercially pure titanium (CP-Ti) undergoes an allotropic transformation at 882.5°C and transforms from a hexagonal close pack (HCP) crystal structure to body-centered cubic (BCC) [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Mechanical Properties of a 3 mm Commercially Pure Titanium Plate (CP-Ti Grade 2)

Mpumlwana

Msomi

Fourie

2021

Journal of Engineering

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Titanium is seen as a good material for application in many fields due to its compatibility with different environments. However, it remains unclear whether what happens when this material is exposed to certain high temperatures for longer periods of time. The primary objective of this study was to investigate the effect of heat on a 3 mm commercially pure titanium grade 2 plate at a constant temperature of 900°C at different heating times. Three different heating times were employed in this study: 30 minutes for the first period, 60 minutes for the second period, and 90 minutes for the third period. All heated samples were air cooled to room temperature after each heating period. Microhardness, microstructure, tensile strength, and scanning electron microscopy (SEM) tests were performed. All the results were analyzed and compared with the parent sample. It was observed that the heating period influenced microstructural arrangement of the material. The microstructural changes affected negatively the ultimate tensile strength while percentage elongation was improved. The microhardness of the heat treated samples were firstly negatively affected which later jumped and exceeded that of the parent material.

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Separation of dynamic recrystallization parameter domains from a chaotic system for Ti–6Al–4V alloy and its application in parameter loading path design

Cited by 10 publications

References 22 publications

Description of Dynamic Recrystallization Behaviors and Grain Evolution Mechanisms during the Hot Forming Process for SAE 5137H Steel

Description of Dynamic Recrystallization Behaviors and Grain Evolution Mechanisms during the Hot Forming Process for SAE 5137H Steel

Response Surface of Speed-Loading Path to Grain Refinement during Current-Heating Compression at SAE 5137H Steel

Effect of Heat Treatment on the Mechanical Properties of a 3 mm Commercially Pure Titanium Plate (CP-Ti Grade 2)

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