Effects of Reduction Pretreatment on the Internal Quality of Casting Billets

Wang, Yuwei; Cai, Qingwu; Li, Gaosheng; Yu, Wei

doi:10.1002/srin.201600337

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…The empirical equation can fit the relationship between austenite grain size and Z parameter 𝑑 = 𝐶 𝑍 . The fitting equation is shown in Equation (12), and the fitting curve is shown in Figure 12b.…”

Section: Grain Size Prediction Modelmentioning

confidence: 99%

“…To control internal defects, researchers proposed many processes such as the soft reduction (SR) process [8,9] and heavy reduction (HR) process. Compared with the conventional process, the HR process applies a larger equivalent strain through a small reduction amount, pressuring the billet's internal shrinkage and porosity [10,11], breaking the dendrite [12], refining the grain, and improving density and segregation [13] based on the temperature gradient rolling. Liu et al [11,13] found that large deformation, induced by temperature gradient…”

Section: Introductionmentioning

confidence: 99%

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Deformation Behavior and Constitutive Equation of 42CrMo Steel at High Temperature

Liu

Cheng

et al. 2021

Metals

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High-temperature reduction pretreatment (HTRP) is a process that can significantly improve the core quality of a billet. The existing flow stress data cannot meet the needs of simulation due to lack of high temperature data. To obtain the hot forming process parameters for the high-temperature reduction pretreatment process of 42CrMo steel, a hot compression experiment of 42CrMo steel was conducted on Gleeble-3500 thermal-mechanical at 1200–1350 °C with the rates of deformation 0.001–10 s−1 and the deformation of 60%, and its deformation behavior at elevated temperature was studied. In this study, the effects of flow stress temperature and strain rate on austenite grain were investigated. Moreover, two typical constitutive models were employed to describe the flow stress, namely the Arrhenius constitutive model of strain compensation and back propagation artificial neural network (BP ANN) model. The performance evaluation shows that BP ANN model has high accuracy and stability to predict the curve. The thermal processing maps under strains of 0.1, 0.2, 0.3, and 0.4 were established. Based on the analysis of the thermal processing map, the optimal high reduction process parameter range of 42CrMo is obtained: the temperature range is 1250–1350 °C, and the strain rate range is 0.01–1 s−1.

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Section: Grain Size Prediction Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Constitutive Equation of 42CrMo Steel at High Temperature

Liu

Cheng

et al. 2021

Metals

Self Cite

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“…The main content of this article is to further study the influence of the RP process on the thick plate quality based on the previous research [14,25]. For this purpose, two billets were produced in the laboratory, and the RP process was applied to one of them.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Simulation Study on the Effect of Reduction Pretreatment on the Void Healing of Heavy Plate

Zhang

Liu

et al. 2022

Metals

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In addition to eliminating voids in a billet, the reduction pretreatment (RP) process can refine the austenite structure after reheating and can deform the residual voids, which affect the void healing behavior during insulation before rolling, and then can affect the final quality of the steel plate. In this study, the effect of the RP process on the evolution of voids in billets and steel plates was investigated by experimental and numerical simulation. RP and non-RP billets were reheated and rolled into 60 mm-thick steel plates, respectively, and the evolutionary behavior of voids within the plates was analyzed using ultrasonic flaw detection methods. Finite element method (FEM) and phase-field method (PFM) were used to investigate the mechanism behind improving the quality of steel plates under the RP process. The simulation results show that, in addition to directly closing the voids through plastic deformation, the RP process can promote the diffusive healing behavior during insulation before rolling by refining the reheated austenite organization and by increasing the curvature of the void surface. Due to the reduction in voids inside the steel plate, the impact energy of the RP steel plate is higher.

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Temperature Influence on Section Uniformity of Casting Steel Rolled with the Hot-Core Heavy Reduction Rolling Process and Traditional Hot Rolling Process

Ning

et al. 2022

J. of Materi Eng and Perform

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Effects of Reduction Pretreatment on the Internal Quality of Casting Billets

Cited by 7 publications

References 21 publications

Deformation Behavior and Constitutive Equation of 42CrMo Steel at High Temperature

Deformation Behavior and Constitutive Equation of 42CrMo Steel at High Temperature

Experimental and Simulation Study on the Effect of Reduction Pretreatment on the Void Healing of Heavy Plate

Temperature Influence on Section Uniformity of Casting Steel Rolled with the Hot-Core Heavy Reduction Rolling Process and Traditional Hot Rolling Process

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