Constitutive equations for modelling flow softening due to dynamic recovery and heat generation during plastic deformation

Zhou, Min; Clode, Michael

doi:10.1016/s0167-6636(97)00035-5

Cited by 102 publications

(65 citation statements)

References 15 publications

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“…It should be noted that due to the lower temperature at the surface area dynamic recrystallization does not occur completely. 8) However, at the inner regions where the temperature drop is not very high and applied strain is larger in comparison with surface area, dynamic recrystallization takes place completely as depicted in Fig. 9 (position 1).…”

Section: Modelling Resultsmentioning

confidence: 98%

“…1) For this reason, a number of investigations have been conducted to determine stressstrain relationship for different materials. [2][3][4][5][6][7][8][9][10][11] Regarding to the published researches, it can be found that a few of the conducted studies have been developed without concerning dynamic phase transformations such as dynamic recovery and dynamic recrystallization. [2][3][4] Although, the derived constitutive relationships give a good agreement with experimental results however because of the effective role of the dynamic microstructural changes, it can cause some limitation in utilizing these kinds of constitutive equation, for example in case of occurring strain accumulation phenomenon, 5) dynamic recrystallization can be taken place and at this point the flow behavior will be different from what is expected.…”

Section: Introductionmentioning

confidence: 99%

“…While in other published research works dynamic recovery and recrystallization have been considered for deriving the flow stress equation but the employed models are applicable only under isothermal and constant strain rate condition. [6][7][8][9][10][11] Therefore, using these models for real deformation condition where both temperature and strain rate are varying, may introduce considerable errors into the calculations.…”

Section: Introductionmentioning

confidence: 99%

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Development of Constitutive Equations for a High Carbon Steel Using Additivity Rule

Serajzadeh

2003

ISIJ International

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Flow behavior of a high carbon steel under hot deformation condition has been studied and a mathematical model for describing the flow stress under isothermal and constant strain rate as well as under nonisothermal and varied strain rates has been developed. For doing so, Bergstrom dislocation model together with the additivity rule for strain have been employed also, hot compression experiments at various temperatures and strain rates have been utilized to achieve the kinetics of dynamic recovery and recrystallization of the high carbon steel. The comparison between the predicted and experimental results under both isothermal and non-isothermal conditions verifies the validity of the proposed model. KEY WORDS: flow stress; finite element method; additivity rule; carbon steel; hot working.

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Section: Modelling Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of Constitutive Equations for a High Carbon Steel Using Additivity Rule

Serajzadeh

2003

ISIJ International

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“…The manufacture of high quality products and optimization of pass schedules require a good knowledge of the relationships between hardening and softening behaviors. Modeling a kinetics equation necessitates a better understanding of the dynamic softening during hot deformation (simultaneous with straining) and the metadynamic or static softening between thermomechanical passes [3][4][5][6]. The modeling results are critical for the optimization of process parameters [7].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Softening Mechanism of 5754 Aluminum Alloy during Multistage Hot Deformation

Deng¹,

Wang²,

Liu³

2017

Preprint

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Abstract:Isothermal interrupted hot compression tests of 5754 aluminum were conducted on a Gleeble-3500 thermo-mechanical simulator at temperatures of 350 °C and 450 °C, and strain rates of 0.1 s −1 and 1 s −1 . To investigate the metadynamic recrystallization behavior, a range of inter-pass delay times (5-60 s) was employed. These tests simulated flat rolling to investigate how softening behaviors respond to controlled parameters, such as deformation temperature, strain rate, and delay times. These data allowed the parameters for the hot rolling process to be optimized. The dynamic softening at each pass and the effect of metadynamic recrystallization on flow properties and microstructural evolution were analyzed in detail. An offset yield strength of 0.2% was employed to calculate the softening fraction undergoing metadynamic recrystallization. A kinetic model was developed to describe the metadynamic recrystallization behaviors of the hot-deformed 5754 aluminum alloy. Furthermore, the time constant for 50% recrystallization was expressed as functions related to the temperature and the strain rate. The experimental and calculated results were found to be in close agreement, which verified the developed model.

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“…[1,[4][5][6] The Garofalo equation is one of the various algebraic equations used for analyzing the stress-strain curves. [7,9] At steady state this equation is usually expressed as:…”

Section: Introductionmentioning

confidence: 99%

A New Constitutive Strain-Dependent Garofalo Equation to Describe the High-Temperature Processing of Materials—Application to the AZ31 Magnesium Alloy

Rieiro

Gutiérrez

Castellanos

et al. 2010

Metall Mater Trans A

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Constitutive equations for modelling flow softening due to dynamic recovery and heat generation during plastic deformation

Cited by 102 publications

References 15 publications

Development of Constitutive Equations for a High Carbon Steel Using Additivity Rule

Development of Constitutive Equations for a High Carbon Steel Using Additivity Rule

Investigation on Softening Mechanism of 5754 Aluminum Alloy during Multistage Hot Deformation

A New Constitutive Strain-Dependent Garofalo Equation to Describe the High-Temperature Processing of Materials—Application to the AZ31 Magnesium Alloy

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