Flow behaviour and constitutive modelling of a ferritic stainless steel at elevated temperatures

Zhao, Jingwei; Jiang, Zhengyi; Zu, Guoqing; Du, Wei; Zhang, Xin; Jiang, Laizhu

doi:10.1007/s12540-016-5541-8

Cited by 18 publications

(16 citation statements)

References 44 publications

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“…In the present study, at the higher strain rate of 10 and 50 s -1 , all the flow stress flow stress curves, however, show slowly continuous flow softening after peak stress. Zhao et al [31] observed a similar phenomenon in cylindrical isothermal compression of 430 FSS, but no intensive study. Han et al [34] pointed out that the hot deformation is not an isothermal process.…”

Section: Flow Stress Behaviourmentioning

confidence: 91%

“…The constitutive modelling and microstructure characteristics are the two major technologies applied to describe the deformation mechanism and optimize deformation parameters. An accurate constitutive model is essential for calculating hot rolling force and computer simulation the forming processes of the alloy [29][30][31]. The understanding of microstructure characteristics under different hot deformation parameters is quite significant to optimize the workability and achieving microstructural control from an engineering viewpoint [16].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Temperature and Strain Rate on the Hot Deformation Behaviour of Ferritic Stainless Steel

Yan

et al. 2019

Met. Mater. Int.

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The flow behaviour and microstructure characteristics of a ferritic stainless steel were investigated using plain strain compression test on a Gleeble 3500 thermo-mechanical test simulator with a hydrawedge system in the temperature range of 850-1100 °C and strain rate range of 0.1-50 s −1. The phenomenological constitutive model and the relationship between the Zener-Hollomon (Z) parameter and flow stress were established. The results reveal that the flow softening phenomenon occurs at high strain rate, which is caused by the coupling effect of the adiabatic heating and dynamic recrystallisation (DRX). New grains nucleate preferentially at the original grain boundaries by strain-induced grain boundary migration. With an increase of temperature or strain rate, a part of new grains form in the interior of deformed grains. The DRX grain size and fraction increase with the increase of temperature, however, exhibit a non-linear relationship with strain rate.

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Section: Flow Stress Behaviourmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Effect of Temperature and Strain Rate on the Hot Deformation Behaviour of Ferritic Stainless Steel

Yan

et al. 2019

Met. Mater. Int.

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“…The liability of the constitutive equation is also being quantified by employing the standard statistical parameters, such as average absolute relative error (AARE) and correlation coefficient (R cc ). These may be presented as [42,43]:…”

Section: Authentication Of the Constitutive Equationsmentioning

confidence: 99%

Hot Deformation Characteristic and Strain Dependent Constitutive Flow Stress Modelling of Ti + Nb Stabilized Interstitial Free Steel

et al. 2020

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An effort has been made to establish a relation between Zener-Hollomon parameter, flow stress and dynamic recrystallization (DRX). In this context, the plastic flow behavior of Ti + Nb stabilized interstitial free (IF) steel was investigated in a temperature range of 650-1100 °C and at constant true strain rates in the range 10 −3-10 s −1 , to a total true strain of 0.7. The flow stress curves can be categorized into two distinct types, i.e. with/without the presence of steady-state flow following peak stress behavior. A novel constitutive model comprising the strain effect on the activation energy of DRX and other material constants has been established to predict the constitutive flow behavior of the IF steel in both α and γ phase regions, separately. Predicted flow stress seems to correlate well with the experimental data both in γ and α phase regions with a high correlation coefficient (0.982 and 0.936, respectively) and low average absolute relative error (7 and 11%, respectively) showing excellent fitting. A detailed analysis of the flow stress, activation energy of DRX and stress exponent in accord with the modelled equations suggests that dislocation glide controlled by dislocation climb is the dominant mechanism for the DRX, as confirmed by the transmission electron microscopy analysis.

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“…To evaluate the accuracy of the constitutive equation, the absolute relative error (E) between the calculated flow stress and the experimental flow stress given by Eq. (9) [18,29,30] was calculated at each strain, and averages over all the strains were calculated, (9) where σ e is the experimental flow stress, σ c is the calculated flow stress, and N is the number of data points at each strain.…”

Section: Constitutive Analysis Following the Standard Proceduresmentioning

confidence: 99%

“…While Eq. (2) generally relates the peak stress or steady-state flow stress, the steady state may not be reached even after a large deformation [4][5][6][7][8][9][10][11] if the microstructure has not yet reached a stable configuration. Dynamic recrystallization (DRX) tends to occur easily in magnesium (Mg) alloys with low stacking fault energies [12].…”

Section: Introductionmentioning

confidence: 99%

Constitutive modeling and understanding of the hot compressive deformation of Mg–9.5Zn–2.0Y magnesium alloy with reduced number of strain-dependent constitutive parameters

Kim

Kwak

2017

Met. Mater. Int.

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The hot compressive flow behavior of the cast Mg-9.5Zn-2.0Y alloy as a function of strain was analyzed, and the degree of dependence of the parameters (A: material constant, n2: stress exponent, Qc: activation energy for plastic flow and : stress multiplier) of the constitutive equation ( ) upon the strain was examined in a systematic manner. This is to explore the possibility of representing the hot compressive deformation behavior of metallic alloys in a simple way by using a reduced number of strain-dependent constitutive parameters. The analysis results for several different cases can be interpreted as follows: (1) Qc can be treated as being strain-independent, which is physically sensible; (2) while only the microstructure changes as a function of strain at low flow stresses, as the flow stress increases, the power-law creep deformation and power-law breakdown mechanisms change; (3) the regime where only A is strain dependent expanded to higher strain rates and lower temperatures as the strain increased, suggesting that the number of the straindependent parameters decreases as the initial microstructure is refined by dynamic recrystallization, and the microstructure approaches a steady state.

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Flow behaviour and constitutive modelling of a ferritic stainless steel at elevated temperatures

Cited by 18 publications

References 44 publications

Effect of Temperature and Strain Rate on the Hot Deformation Behaviour of Ferritic Stainless Steel

Effect of Temperature and Strain Rate on the Hot Deformation Behaviour of Ferritic Stainless Steel

Hot Deformation Characteristic and Strain Dependent Constitutive Flow Stress Modelling of Ti + Nb Stabilized Interstitial Free Steel

Constitutive modeling and understanding of the hot compressive deformation of Mg–9.5Zn–2.0Y magnesium alloy with reduced number of strain-dependent constitutive parameters

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