Prediction of the critical conditions for initiation of dynamic recrystallization

Mirzadeh, Hamed; Najafizadeh, A.

doi:10.1016/j.matdes.2009.09.038

Cited by 233 publications

(121 citation statements)

References 21 publications

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“…The critical stresses for initiation of DRX (σ C ) were obtained from the inflection points in the work hardening rate (θ=dσ/dε) versus flow stress (σ) curves (before the peak stress) or from the minimums in the -dθ/dσ versus σ curves [16,17]. The former plots were used to determine other characteristic stresses.…”

Section: Work Hardening Rate Analysismentioning

confidence: 99%

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

Saadatkia

Mirzadeh

Cabrera

2015

Materials Science and Engineering: A

148

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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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Section: Work Hardening Rate Analysismentioning

confidence: 99%

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

Saadatkia

Mirzadeh

Cabrera

2015

Materials Science and Engineering: A

148

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“…The study of dynamic recrystallization by metallography has been extensively reported in the literature and more recently by Achary and Venugopalan (2000) and Mirzadeh and Najafizadeh (2010).…”

Section: Dynamic Recrystallization Microstructurementioning

confidence: 99%

“…At this temperature, SG iron is in the range of stability of the austenite phase. According to previous studies (Mirzadeh and Najafizadeh, 2010) and due to the low stacking fault energy of austenite, the major restoration process during hot deformation is dynamic recrystallization. In fact, the low stacking fault of the face centered cubic structure such as the austenite promotes most of the lattice dislocations to dissociate into partials.…”

Section: Introductionmentioning

confidence: 96%

“…Concerning the austenitic stainless under hot compression tests (Mirzadeh and Najafizadeh, 2010) or hot torsion tests (Ryan and McQueen, 1990) at temperatures of 900-1200°C with strain rate of 0.001-10 s -1 , the kinetic of dynamic recovery in austenite phase is deemed low. The authors also show that the most often dynamic recrystallization is activated at a critical condition of stress accumulation.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the brittle–ductile transition in hot cutting of SG iron specimens

Fouilland

Mansori

2013

Journal of Materials Processing Technology

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. When cutting data were discussed with respect to the influences of cutting parameters and obtained cut surface, the correlation is significantly rich. Both cut surface integrity, cutting force curves and metallographic results show a BDT indicating a change in the dominating hot cutting process mechanism. Such a transition is associated with the dynamic recrystallization promoting strain softening and hot cutting by ductile shearing.

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“…Due to low stacking fault energy of austenite, the major restoration process during hot deformation is dynamic recrystallization (DRX) [10][11][12][13][14]. DRX is an important phenomenon for controlling microstructure and mechanical properties in hot working.…”

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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Prediction of the critical conditions for initiation of dynamic recrystallization

Cited by 233 publications

References 21 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

Experimental study of the brittle–ductile transition in hot cutting of SG iron specimens

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

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