Microstructure evolution and a unified constitutive model for a Ti-55511 alloy deformed in β region

Jiang, Yu-Qiang; Lin, Y.C.; Wang, Guan-Qiang; Pang, Guo-Dong; Chen, Mingsong; Huang, Zhichao

doi:10.1016/j.jallcom.2021.159534

Cited by 68 publications

(17 citation statements)

References 66 publications

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“…Moreover, the value of

was 1.2. Because of the narrow high-temperature forming window, the strain rate of titanium alloys usually ranges from 0.001 s −1 to 1 s −1 , as noted in previous studies [ 8 , 47 , 52 ]. So, in the present study, the selected values of

and

were 0.001 s −1 , 0.01 s −1 , 0.1 s −1 , and 1 s −1 , respectively.…”

Section: Materials and Experimentsmentioning

confidence: 98%

“…The isothermal double-stage thermal compression tests were conducted using a Gleeble 3500 technique. Investigations into the microstructural changes and flow features of Ti-55511 titanium alloys during hot deformation with a constant strain rate are widely reported in previous works [ 47 , 52 ]. Nevertheless, the strain rate during the actual industrial manufacturing of parts is normally varied.…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…The evolution and interaction of microstructures can induce the activation of intricate metallurgical mechanisms, i.e., work-hardening (WH), DRV, and DRX, which then leads to the changes in flow behaviors. Therefore, the change in flow stress for the alloy during hot deformation can be given as [ 47 , 52 ]:

where

is flow stress,

is a short-range component, and

is dislocation interaction stress.…”

Section: The Physical Mechanism Constitutive Modelmentioning

confidence: 99%

“…However, the two aforementioned types of constitutive models have difficulty clarifying the microstructural change mechanisms of alloys during high-temperature forming. To develop constitutive models which consider the effects of metallurgical evolution mechanisms, several physical mechanism-based (PMB) equations were proposed to describe the high-temperature flow features of alloys [ 46 , 47 ]. Two representative PMB models, including the viscoplastic flow equation [ 48 ] and the internal-state-variable equation [ 49 , 50 ], were established and utilized to exactly predict the hot-forming features of some titanium alloys.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 2. Original microstructures of the researched alloy (OIM image is indicated in a previous study[47]). …”

mentioning

confidence: 99%

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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

Lin

et al. 2021

Materials

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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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“…Moreover, the value of

and

were 0.001 s −1 , 0.01 s −1 , 0.1 s −1 , and 1 s −1 , respectively.…”

Section: Materials and Experimentsmentioning

confidence: 98%

Section: Materials and Experimentsmentioning

confidence: 99%

where

is flow stress,

is a short-range component, and

is dislocation interaction stress.…”

Section: The Physical Mechanism Constitutive Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Figure 2. Original microstructures of the researched alloy (OIM image is indicated in a previous study[47]). …”

mentioning

confidence: 99%

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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

Lin

et al. 2021

Materials

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Dynamic Recrystallization Behavior of Low‐Carbon Steel during the Flexible Rolling Process: Modeling and Characterization

Liu

Mapelli

Peng

et al. 2021

steel research int.

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Dynamic recrystallization (DRX) is the predominant softening mechanism under high‐temperature large‐plastic deformation and determines the microstructure evolution of steel. Herein, an equivalent substitution method is proposed to investigate the coupling effect of deformation conditions on microstructural evolution during the flexible rolling process. Low‐carbon steel is compressed using a Gleeble 3800‐GTC thermal–mechanical physical simulation system at temperatures ranging from 900 to 1100 °C and strain rates ranging from 0.01 to 10 s−1. The flow stress behaviors under different deformation conditions are discussed. Accordingly, the relationship between strain rate and temperature is established using the Zener–Hollomon equation. Further, a new DRX model is proposed by combining the theoretical implications of previous models. The effectiveness of the experimental model and predicted model is statistically evaluated to accurately determine the DRX volume fraction of the experimental steel. Based on the dynamic material model, a hot processing map of the experimental steel is also developed to evaluate the steel's hot workability. Finally, the microstructure of the experimental steel is analyzed under specific deformation parameters. The results demonstrate that DRX behavior decreases as the upper roller is raised and the lower roller is lowered during the flexible rolling process.

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The phenomenological and physical constitutive analysis of hot flow behavior of Al/Cu bimetal composite

Shayanpoor

Ashtiani

2022

Appl. Phys. A

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Microstructure evolution and a unified constitutive model for a Ti-55511 alloy deformed in β region

Cited by 68 publications

References 66 publications

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

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

Dynamic Recrystallization Behavior of Low‐Carbon Steel during the Flexible Rolling Process: Modeling and Characterization

The phenomenological and physical constitutive analysis of hot flow behavior of Al/Cu bimetal composite

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