Constitutive modeling and prediction of hot deformation flow stress under dynamic recrystallization conditions

Mirzadeh, Hamed

doi:10.1016/j.mechmat.2015.02.014

Cited by 98 publications

(40 citation statements)

References 34 publications

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“…The basic constitutive equations in hot working are based on expressing Z as a function of flow stress as shown below [7,8]:…”

Section: Constitutive Modelingmentioning

confidence: 99%

“…Since the deformation mechanism during hot working is usually based on the glide and climb of dislocations, the lattice self-diffusion activation energy can be employed as the deformation activation energy to determine Z [19]. As a result, the value of Q SD = 270 kJ/mol [8,18] was considered for both steels in this work. Based on Eq.…”

Section: Constitutive Modelingmentioning

confidence: 99%

“…The understanding of the hot deformation behavior together with the constitutive relations describing material flow is a prerequisite for large-scale production in the industry. The constitutive modeling of flow stress is thus important in forming processes because any feasible mathematical simulation needs accurate flow description [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Hot deformation behavior, dynamic recrystallization, and physically-based constitutive modeling of plain carbon steels

Saadatkia

Mirzadeh

Cabrera

2015

Materials Science and Engineering: A

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150

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The high-temperature deformation behaviors of low and medium carbon steels with respectively 0.06 and 0.5 wt.% C were investigated under strain rate and temperature ranges of 10 -4 -10 -1 s -1 and of 900-1100 °C. Three types of dynamic recrystallization (DRX) flow behaviors were identified, namely single peak, multiple transient steady state, and cyclic behaviors. The normalized critical stress (and strain) for the low and medium carbon steels were about 0.846 (0.531) and 0.879 (0.537), respectively. For both steels, the apparent deformation activation energy and the power of the hyperbolic sine law were found to be near the lattice self-diffusion activation energy of austenite (270 kJ/mol) and 4.5, respectively. As a result, it was concluded that the flow stress of plain carbon steels during hot deformation is mainly controlled by dislocation climb, and based on physically-based constitutive analysis, it was found that carbon has a slight effect on the hot flow stress of plain carbon steels. The significance of the approach used in this work was shown to be its reliance on the theoretical analysis based on the deformation mechanisms, which makes the comparison more reliable.

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“…The basic constitutive equations in hot working are based on expressing Z as a function of flow stress as shown below [7,8]:…”

Section: Constitutive Modelingmentioning

confidence: 99%

Section: Constitutive Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hot deformation behavior, dynamic recrystallization, and physically-based constitutive modeling of plain carbon steels

Saadatkia

Mirzadeh

Cabrera

2015

Materials Science and Engineering: A

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150

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“…The understanding of the microstructural behavior of the steel under consideration is therefore required, together with the constitutive equations describing material flow [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…The modeling of hot flow stress and the prediction of flow curves are important in metal-forming processes from the mechanical and metallurgical standpoints because this is an essential part of the numerical simulations in finite element codes. As a result, considerable researches have been focused on this subject in recent years [6,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

A simple constitutive model for predicting flow stress of medium carbon microalloyed steel during hot deformation

2015

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 1 A Simple Constitutive Model for Predicting Flow Stress of Medium Carbon Microalloyed Steel during Hot Deformation AbstractThe constitutive behavior of a medium carbon microalloyed steel during hot working over a wide range of temperatures and strain rates was studied using the Johnson-Cook (JC) model, the Hollomon equation, and their modifications. The original JC model was not able to predict the softening part of the flow curves and the subsequent modifications of the JC model to account for the softening stage and the strain dependency of constants were not satisfactory owing to the uncoupled nature of the JC approach regarding strain rate and temperature. The coupled effect of these variables was considered in the form of Zener-Hollomon parameter (Z) and the constants of the Hollomon equation were related to Z. This modification was found to be useful for the hardening stage but the overall consistency between the experimental flow curves and the calculated ones was not good. Therefore, a simple constitutive model was proposed in the current work, in which by utilization of the peak stress and strain into the Hollomon equation, good prediction abilities were attained. Conclusively, the proposed model can be considered as an efficient one for modeling and prediction of hot deformation flow curves.

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Constitutive Model and Processing Maps for a Ti‐55511 Alloy in β Region

et al. 2019

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The flow behavior of a high‐strength Ti alloy (Ti‐55511) in the β region is studied by hot compressive experiments. A dislocation density–based constitutive equation, together with processing maps, is established to describe the flow behavior and hot workability of the studied Ti alloy. It is found that the strain rate (εfalse˙) and temperature (T) distinctly influence the hot compressive deformation behavior. The flow stress increases distinctly with a rising εfalse˙ or reducing T. The main softening mechanism in the β region is dynamic recovery (DRV). The established constitutive equation based on the work hardening (WH) and DRV mechanisms has the desired prediction accuracy, and the correlation coefficient between the predicted and experimental results is 0.9912. The processing maps indicate that a high strain rate (0.4–10 s−1) easily causes unstable deformation, whereas low and medium strain rates (0.001–0.2 s−1) are suitable for hot compressive deformation of the studied alloy.

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Constitutive modeling and prediction of hot deformation flow stress under dynamic recrystallization conditions

Cited by 98 publications

References 34 publications

Hot deformation behavior, dynamic recrystallization, and physically-based constitutive modeling of plain carbon steels

Hot deformation behavior, dynamic recrystallization, and physically-based constitutive modeling of plain carbon steels

A simple constitutive model for predicting flow stress of medium carbon microalloyed steel during hot deformation

Constitutive Model and Processing Maps for a Ti‐55511 Alloy in β Region

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