Numerical analysis of temperature and residual stresses in hot-rolled steel strip during cooling in coils

Witek, Szczepan; Milenin, A.

doi:10.1016/j.acme.2017.11.002

Cited by 17 publications

(8 citation statements)

References 14 publications

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“…The intercept of Equation ( 7) was negligible. Substituting Equation ( 6) into Equation (7), the multiple regression model of Y * and x * i could be obtained, and the results are shown in Equation (8).…”

Section: Effect Of Edge Masking On Microstructure Heterogeneitymentioning

confidence: 99%

“…On the other hand, it will cause the differences in the microstructure of the strip which will lead to the heterogeneous distribution of mechanical property [5][6][7]. The heterogeneity will not only reduce the product yield, but also affect the downstream processing [8]. As a result, the final product quality of high-strength low-alloy hot-rolled strip is highly dependent on the laminar cooling control technology [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…inverse operation of Equation(8) with Equation (2). Y = −0.00007x 1 + 0.00414x 2 − 0.01278x 3 − 0.03107x 4 − 0.02253x 5 + 0.00200x 6 + 4.16010(9) …”

mentioning

confidence: 99%

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Homogeneous cooling control technology for high-strength low-alloy hot-rolled strip

Fei

Zhao

Xue

2023

Ironmaking & Steelmaking

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Heterogeneities of transverse temperature during laminar cooling of high-strength low-alloy hotrolled strip can cause heterogeneous distribution of microstructure, mechanical property and internal stress. Edge masking is a control technology that can be used to improve laminar cooling heterogeneities. In this paper, different edge masking schemes were set up based on the transverse transformation characteristics of the strip. The results show that a slow cooling of 7.1 s during transformation could reduce the heterogeneity of grain size, internal stress and microhardness at the edge and middle of the strip. In addition, the relationship model between grain size and six variables such as transformation start temperature was established by PCA. It provided a new idea for the construction of a microstructure prediction model under nonlinear cooling.

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Section: Effect Of Edge Masking On Microstructure Heterogeneitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Homogeneous cooling control technology for high-strength low-alloy hot-rolled strip

Fei

Zhao

Xue

2023

Ironmaking & Steelmaking

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“…They found that the cooling mode changing the length direction cannot reduce the transverse temperature difference and had little effect on the distribution of residual stress. Witek and Milenin [14] studied the residual stress level in the final coil by using early and late laminar cooling mode. The appropriate selection of laminar cooling conditions allowed to reduce the phase transformation in the coil and reduce the level of residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Residual stress control of hot-rolled strips during run-out table cooling

Sun

Wen

et al. 2023

Int J Adv Manuf Technol

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The strips with good flatness after finish rolling will have flatness defects such as edge wave after run-out table cooling. These defects are caused by the residual stress due to inhomogeneous thermal and microstructural behaviors during the cooling stage.The traditional residual stress control methods rely too much on experience, resulting in poor control effect and poor universality. Therefore, this study proposed two residual stress control methods based on model calculation: water flow central crown, and center wave compensation control. The former is mainly based on controlling the uniformity of strip transverse temperature and microstructure. The latter is mainly controlled by mutual compensation of internal stresses. In this paper, the mathematical models of water flow central crown cooling and critical center wave compensation stress were established respectively. Meanwhile, a post-buckling model of hot-rolled strip was established to calculate the aim flatness value at exit of finishing mill under critical compensation stress. Furthermore, a fully coupled finite element model based on temperature, phase transitions, and stress was developed and it was verified using experimental data. Finally, the above two residual stress control methods were realized in the finite element model. The results showed that the two methods can reduce the residual stress and improve the flatness, and the application of center wave compensation control is more effective.

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“…18,19 Thermomechanical models can predict residual stresses developed in various manufacturing processes. 20,21 Implementing other constitutive models in industrial processes is computationally difficult due to large number of variables involved. 22,23 Garafalo and extended Ludwik models are used for modelling solid-state quenching and casting processes of AZ31 alloy in the present work.…”

Section: Introductionmentioning

confidence: 99%

Analysis of hot tensile behaviour and prediction of thermal stresses during processing of AZ31 magnesium alloy

Divya

Penumakala

Kalyan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The use of magnesium alloys is rapidly increasing in automotive and aerospace industries. Accurate constitutive modelling of material at high temperature is a key input for numerical simulation of manufacturing processes. In the present work, hot tensile deformation behaviour of AZ31 alloy was studied by performing uniaxial tensile tests in the temperature range of 250°C–450°C and strain rates ranging from 0.1 to 0.001 s−1. The flow stress behaviour of AZ31 alloy was modelled using two rate-dependent inelastic models, viz. Garafalo law and extended Ludwik law. Various constants in these models were predicted as a function of strain rate and temperature. These rate dependent laws were integrated using Finite Element (FE) based algorithms for thermo-mechanical simulation. Evolution of thermal stresses in solid state quenching and static casting of AZ31 alloys were studied. Results reveal that both material models accurately predict the evolution of thermal stresses for high temperature quenching and casting processes.

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Numerical analysis of temperature and residual stresses in hot-rolled steel strip during cooling in coils

Cited by 17 publications

References 14 publications

Homogeneous cooling control technology for high-strength low-alloy hot-rolled strip

Homogeneous cooling control technology for high-strength low-alloy hot-rolled strip

Residual stress control of hot-rolled strips during run-out table cooling

Analysis of hot tensile behaviour and prediction of thermal stresses during processing of AZ31 magnesium alloy

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