Residual Stress Simulation for Hot Strip Bimetallic Roll during Quenching

Noda, Nao–Aki; Hu, Kejun; Sano, Yoshikazu; Ono, Katsma; Hosokawa, Yusuke

doi:10.1002/srin.201500430

Cited by 22 publications

(24 citation statements)

References 21 publications

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“…Assume the cylinder surface temperature Ts = T(300) = 800°C, which may produce the surface stress σ z (300) ≅ − 600 MPa often appearing at the surface after the standard quenching. 9,10) Here, assume that all material data of DCI are depending on temperature distribution T(r) as shown in Figs. 4(a), 4(b) and 4(c) for Young's modulus E, thermal expansion coefficient α and Poisson's ratio ν.…”

Section: Thermo-elastic Stress For Cylinder and Diskmentioning

confidence: 99%

“…This thermal breakage originates near the roll center and breaks out to the barrel surface. [6][7][8] In our previous studies, 9,10) therefore, different quenching methods were discussed through FEM simulation to produce suitable surface compressive residual stresses and reduce the center tensile residual stress. In real work rolls, however, the existence of suitable residual stress distribution should be confirmed experimentally.…”

Section: Introductionmentioning

confidence: 99%

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Accuracy of Disk Method to Predict Roll Residual Stress by Measuring the Sliced Disk Stress

Noda

Sano

et al. 2017

ISIJ Int.

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Bimetallic rolls are widely used in steel rolling industries because of the excellent hardness, wear resistance and high temperature properties. Controlling the residual stress distribution is necessary since the compressive residual stress at the surface may improve fatigue life though the tensile residual stress at the center may reduce the strength. Therefore, it is necessary to measure the residual stress distribution from the surface to center correctly to ensure the roll quality. The disk method has been widely used in predicting the roll residual stress by measuring the stress of the thin sliced disk from the roll. In this study, therefore, the relation between the original roll residual stress and the sliced disk residual stress is investigated for the single material roll and bimetallic roll on the basis of thermo-elastic-plastic FEM analysis. The effect of the quenching time is discussed as well as the effect of the sliced disk thickness on the residual stress.

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Section: Thermo-elastic Stress For Cylinder and Diskmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Accuracy of Disk Method to Predict Roll Residual Stress by Measuring the Sliced Disk Stress

Noda

Sano

et al. 2017

ISIJ Int.

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“…Volume expansions of core and shell accompany the phase transformations. Similar to the previous study, [15] the thermal expansion coefficients are used as input data to express the volume expansions.…”

Section: Quenching After Non-uniform Heating and Fem Modelingmentioning

confidence: 99%

“…In the previous study, [15] the residual stress was discussed for the quenching process after conventional uniform heating. To discuss the effects of non-uniform heating quenching, the results of the uniform heating quenching should be summarized.…”

Section: Summary Of Residual Stress Due To Uniform Heating Quenchingmentioning

confidence: 99%

“…Therefore, in our previous study, the residual stress simulation was performed for quenching of bimetallic rolls after the roll was heated up uniformly. [15] Then, the generation mechanism and distribution of residual stress were investigated. Also, the effects of the shell-core ratio, diameter, phase transformation, and material heat treatment process on the residual stress were discussed.…”

Section: Introductionmentioning

confidence: 99%

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Usefulness of Non-Uniform Heating and Quenching Method for Residual Stress of Bimetallic Roll: FEM Simulation Considering Creep Behavior

Noda

Sano

et al. 2016

steel research int.

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Bimetallic rolls are widely used in steel rolling industries because of the excellent hardness, wear resistance, and high temperature properties. Controlling the residual stress distribution is important to improve the roll fatigue life due to the compressive residual stress at the roll surface. Recently, to reduce the tensile residual stress appearing at the roll center, quenching heat treatment is performed just after heating the roll non-uniformly instead of heating the roll uniformly with enough time. In this paper, therefore, the residual stresses are compared after between the uniform heating quenching and the non-uniform heating quenching on the basis of the FEM simulation. The results show that tensile stresses at the roll center for non-uniform heating are smaller than that for uniform heating by 400 MPa, although the same compressive stresses appear at the surface. The effect of creep on stress relaxation is also considered in this study. By considering creep, the maximum tensile residual stress decreases by 8% for uniform heating and by 15% for non-uniform heating.

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Evaluation of Thermal Breakage in Bimetallic Work Roll Considering Heat Treated Residual Stress Combined with Thermal Stress during Hot Rolling

Xia

Fang

et al. 2017

steel research int.

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Bimetallic rolls are widely used in steel rolling industry because of their excellent hardness, wear resistance, and high temperature properties. Heat treated residual stresses consist of compressive stress in the shell and tensile stress in the core are produced in the bimetallic roll during heat treatment. In the subsequent hot rolling process, severe thermal stresses are caused by heating-cooling thermal cycles at the roll surface. The combination of heat treated residual stresses and thermal stresses will cause a complex stress field in work roll during hot rolling process. The high combined tensile stress at the roll center may cause thermal breakage, once the tensile stress exceeds the material strength. Consequently, it is necessary to investigate the combined stresses to improve roll service life during hot rolling process. In this paper, the combined stresses in the work roll during hot rolling are investigated based on the FEM simulation, considering the heat treated residual stress after tempering process and thermal stress generated during hot rolling. In addition, the thermal breakage of work roll is evaluated in breakdown of water cooling systems and rolling incidents.

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Residual Stress Simulation for Hot Strip Bimetallic Roll during Quenching

Cited by 22 publications

References 21 publications

Accuracy of Disk Method to Predict Roll Residual Stress by Measuring the Sliced Disk Stress

Accuracy of Disk Method to Predict Roll Residual Stress by Measuring the Sliced Disk Stress

Usefulness of Non-Uniform Heating and Quenching Method for Residual Stress of Bimetallic Roll: FEM Simulation Considering Creep Behavior

Evaluation of Thermal Breakage in Bimetallic Work Roll Considering Heat Treated Residual Stress Combined with Thermal Stress during Hot Rolling

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