Microstructural evolution on streamlines during hot strip rolling using internal state variables

Toloui, Mostafa; Serajzadeh, S.

doi:10.1016/j.jmatprotec.2008.04.019

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…Horstemeyer and Bammann (2010) reviewed the development and usage of internal state variables (ISV) and stated that the ISV equations can be implemented into common CAE codes and thus materials processes can be modelled and optimized. Toloui and Serajzadeh (2009) employed the ISV method and developed a set of microstructural evolution constitutive equations for predicting static recrystallization fraction change after hot strip rolling. Although it is difficult to determine the constants arising in the model due to the complication of the equations, the power of the material model has been demonstrated for real applications.…”

Section: Introductionmentioning

confidence: 99%

A new application of unified constitutive equations for cross wedge rolling of a high-speed railway axle steel

Huo

Bai

Wang

et al. 2015

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

A new application of unified constitutive equations for cross wedge rolling of a high-speed railway axle steel

Huo

Bai

Wang

et al. 2015

Journal of Materials Processing Technology

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“…Horstemeyer and Bammann [15] reviewed the development and usages of ISV and stated that the ISV equations can be implemented into common CAE codes and thus materials processes can be modelled and optimised. Toloui and Serajzadeh [16] employed the ISV method to develop a set of microstructure evolution model for predicting the static recrystallization fraction change after hot strip rolling. Lin [4,10] and Liu [11,12] have conducted a lot of work on viscoplastic damage model using ISV method.…”

Section: Introductionmentioning

confidence: 99%

Viscoplastic Damage Constitutive Modelling of High-Speed Railway Axle Steel 25CrMo4

Huo

Wang

Bai

et al. 2014

KEM

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Ductile damage inadvertently exists in the steel during hot tension. The ductile damage during hot forming directly influences the mechanical properties of 25CrMo4 steel for high-speed railway axle. To investigate the grain growth/refinement rule and damage features of 25CrMo4 in hot forming, grain growth test and grain refinement test were conducted using the thermal mechanical simulator Gleeble-1500. In the grain growth test, the specimens were compressed to ensure that the initial austenitic grain size was small enough, then held at the deformation temperatures (1223K, 1273K, 1323K and 1373K) for 0min, 10min, 20min and 30min, respectively, to study the grain growth rule. In the grain refinement test, the specimens were stretched to different strain level at three temperatures (1313K, 1373K and 1433K) with two strain rates of 1.0/s and 10.0/s to study the grain refinement rule. The micro-voids and micro-cavities were found in tensile specimens during grain refinement test. Based on damage evolution mechanisms, damage constitutive equations are formulated to model the evolution of micro-voids and micro-cavities for 25CrMo4 under hot forming conditions. Partial experiment data were used to determine the material constants in damage constitutive equations by using the Genetic Algorithm (GA) method. To validate the model, the experimental data and computed curves of effective stress and grain size were compared. Close agreements were found between the experimental and prediction results. The developed viscoplastic damage equations are able to characterize the deformation behaviour of 25CrMo4 in hot tension process.

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“…Sitdikov et al [4] investigated the evolution of the fine-grained structure of Al-Mg-Sc alloy caused by both dynamic and static recrystallization during equal channel angular pressing (ECAP) process. Furu and Toloui et al [5][6] investigated the static recrystallization behavior of Al alloys under varying strain-rate conditions, based on which an internal state variable model for static recrystallization was developed. Li et al [7] studied the mechanisms of static recrystallization behavior of 7050 aluminum alloy during the cooling process after hot compression.…”

Section: Introductionmentioning

confidence: 99%

Static softening characteristics and static recrystallization kinetics of aluminum alloy A6082 after hot deformation

Zhang

2010

J. Shanghai Jiaotong Univ. (Sci.)

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The static softening behavior of aluminum alloy A6082 was investigated by interrupted hot tests conducted on Gleeble-1500 simulator at deformation temperatures from 573 to 773 K and strain rates from 0.1 to 10 s −1 , with a pre-strain from 0.3 to 0.7 and variable inter-pass delay times. The offset method was applied to convert the changes in flow stress between two passes to static softening fraction. The microstructural changes were characterized by the quantitative metallography of quenched specimens. The results showed both static softening and static recrystallization curves exhibited a simple sigmoidal shape; the static softening is related to the static recrystallization in a nonlinear manner with 50% static recrystallized volume fraction corresponding to 80% static softening fraction; an increase in temperature, strain rate or pre-strain yields a decrease in the time for 50% static recrysallized volume fraction, on which the temperature has the most remarkable influence; Si and Mn additions accelerate the process of static recrystallization. Finally, the equations of static recrystallization kinetics of this alloy were developed with a good agreement between the predicted and experimental results.

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Microstructural evolution on streamlines during hot strip rolling using internal state variables

Cited by 4 publications

References 25 publications

A new application of unified constitutive equations for cross wedge rolling of a high-speed railway axle steel

A new application of unified constitutive equations for cross wedge rolling of a high-speed railway axle steel

Viscoplastic Damage Constitutive Modelling of High-Speed Railway Axle Steel 25CrMo4

Static softening characteristics and static recrystallization kinetics of aluminum alloy A6082 after hot deformation

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