Hot deformation behavior of a medium carbon microalloyed steel

Mirzadeh, Hamed; Cabrera, J.M.; Prado, J. M.; Najafizadeh, A.

doi:10.1016/j.msea.2011.01.098

Cited by 240 publications

(133 citation statements)

References 15 publications

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“…The obtained value of normalized critical strain is also consistent with previous studies (mainly on steels) which have reported a value in the range of 0.3-0.9 [3]. The normalized critical strain of ~ 0.53 is lower than the one reported for medium carbon microalloyed steel (~ 0.62) [18], which reveals that carbon does not significantly affect this value but the microalloying elements are effective in retardation of recrystallization. …”

Section: Work Hardening Rate Analysissupporting

confidence: 90%

“…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%

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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

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 Analysissupporting

confidence: 90%

Section: Constitutive Modelingmentioning

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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“…Similar value of apparent activation energy was reported for medium carbon microalloyed steel. 19,20) This activation energy value is much larger than the self -diffusion activation energy of austenitic steel (311.1 KJ/mol) due to influence of alloying elements having lower stacking fault energy. 21) By putting the values of the strain rate, temperatures and flow stress, the relationship between ln[sinh (α σ)] and ln (Z)(R 2 = 0.987) can be obtained (Fig.…”

Section: Determination Of Materials Constantsmentioning

confidence: 88%

Modelling of Flow Stress and Prediction of Workability by Processing Map for Hot Compression of 43CrNi Steel

Kumar

Rajput

et al. 2017

ISIJ International

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The isothermal hot compression tests of 43CrNi steel was carried out at temperatures 800°C to 1 050°C at an interval of 50°C and at constant strain rates of 0.01, 0.1, 1.0 and 10 s − 1 for total true strain of 0.7. The values of experimental stress were corrected for adiabatic heating which was used for flow stress modeling, and further its predictability was verified with experimental results. The true stress-true strain curves exhibit peak stresses followed by softening due to occurrence of DRX. The activation energy was calculated based on sinh type equation and found to be increasing with increase in strain. The obtained stress exponent 5.4, suggests that the mechanism of hot deformation is dislocation glide controlled by dislocation climb. Strain rate sensitivity maps and processing maps were developed using dynamic materials model (DMM), modified DMM with different instability criteria. The instability parameter, κ j , is directly related to the dissipative function which is associated to microstructural changes, J, whereas the instability parameters, ξ and κ, are associated with the strain rate sensitivity parameter, m. Therefore, the instability parameter, κ j , is more mathematically precise as it eliminates m from its calculations. The microstructures of deformed specimens were studied and correlated with the domains of processing maps to validate the workability region.KEY WORDS: medium carbon low alloy steel; processing maps; hot deformation; constitutive analysis; thermo mechanical simulator.

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“…During initial stages of deformation, the dislocations multiplication and interaction result in an dislocation density reaches a critical value, the DRX becomes operative and because of softening that occurs by DRX process, the flow curve experiences a peak and afterward, a flow softening region appears and continues till reaching the steady-state stress. [6,18]. As shown in Fig.…”

Section: Flow Curvesmentioning

confidence: 87%

“…The elastic region of flow curves was subtracted for subsequent flow stress analyses and modeling. More information about the hot deformation experiments on this material has been reported elsewhere [3,18] and are here revisited. …”

Section: Experimental Materials and Proceduresmentioning

confidence: 94%

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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Hot deformation behavior of a medium carbon microalloyed steel

Cited by 240 publications

References 15 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

Modelling of Flow Stress and Prediction of Workability by Processing Map for Hot Compression of 43CrNi Steel

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

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