Investigation of the Evolution of Central Defects in Ultra-Heavy Plate Rolled Using Gradient Temperature Process

Li, Gaosheng; Yu, Wan-Chin; Cai, Qingwu

doi:10.1007/s11663-014-0235-4

Cited by 19 publications

(4 citation statements)

References 19 publications

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“…One is that the central microcracks and severe segregation generated during casting are difficult to eliminate by the rolling process due to limited ingot-to-plate reduction ratios. [5,6] The other challenge is that the martensite fraction cannot be guaranteed in the centerthickness layer due to the weak capability of immersion quenching in water tanks, which has been widely used in the production of ultraheavy steel plates with thickness over 120 mm. Thus, the detrimental strength and toughness at the center have long been the well-known bottleneck for ultraheavy steel plate.…”

Section: Introductionmentioning

confidence: 99%

Superior Through‐Thickness Homogeneity of Microstructure and Mechanical Properties of Ultraheavy Steel Plate by Advanced Casting and Quenching Technologies

Wang

et al. 2021

steel research int.

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Keeping through‐thickness homogeneity of mechanical properties has been a great challenge for producing heavy gauge steel plates. Herein, a superior homogeneity of microstructure and hence strength and toughness achieved in a quenched and tempered (QT) 210 mm‐thickness steel plate produced by advanced electroslag remelting casting and roller quenching (ESR–RQ) technologies are reported. Some comparisons are made with a QT 178 mm steel plate produced by conventional mold casting and immersion quenching in the water tank (MC‐IQ). The martensite of the as‐quenched ESR–RQ steel is distributed homogeneously across the thickness with a fraction of 39% at the 1/2 thickness, remarkable higher 34% than that of MC‐IQ steel. ESR–RQ steel appears excellent comprehensive mechanical properties even for the as‐quenched samples, as well as QT samples. Comparing with the MC‐IQ steel, the Charpy impact energy at −60 °C is 150 J (278%) higher for the samples tempered at 650 °C, and the yield strength is 137 MPa (18%) higher for the samples tempered at 600 °C than those of MC‐IQ steel, respectively. The considerable improvement can be attributed to homogeneous through‐thickness microstructures, including refined prior austenite grains, effective grain size, and carbide precipitates.

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Section: Introductionmentioning

confidence: 99%

Superior Through‐Thickness Homogeneity of Microstructure and Mechanical Properties of Ultraheavy Steel Plate by Advanced Casting and Quenching Technologies

Wang

et al. 2021

steel research int.

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“…It uses a laminar cooling/rapid cooling process to form a temperature gradient in the thickness direction of the slab before rolling, with the center temperature being far higher than the surface temperature [4,8]. The lower deformation resistance of the higher center temperature makes deformation easier to penetrate into the center, resulting in more uniform deformation and recrystallization of the steel plate in the thickness direction [8,13].…”

Section: Introductionmentioning

confidence: 99%

Effect of a Gradient Temperature Rolling Process on the Microstructure and Mechanical Properties of the Center of Ultra-Heavy Plates

Cong,

Zhao,

Wang

et al. 2024

Metals

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As there is a small amount of deformation in the center during the rolling process of ultra-heavy plates, it is extremely easy to cause poor mechanical properties in the center. Increasing the deformation in the center is the most feasible method to eliminate the deformation effects in the cross-section of ultra-heavy plates. In this study, the gradient temperature rolling (GTR) process is compared with the traditional uniform temperature rolling (UTR) process. It is found that the GTR process can significantly increase the deformation in the center and thereby refine the grains.. The room temperature tensile test and instrumented Charpy impact test are used to test the strength at room temperature and impact energy at low temperature. Combined with the obtained impact load/energy displacement curve, the deformation and damage process under impact load are analyzed. The microstructure morphology and impact fracture obtained by different rolling processes in the center are analyzed by experimental methods such as OM, SEM, EBSD, etc. The prior austenite grain (PAG) boundary morphology is analyzed and the densities of grain boundaries are statistically quantified. The results showed that the strength, plasticity, and low-temperature toughness of the GTR process are improved compared to the UTR process, with increased dislocation density in the center microstructure, the density of PAG boundaries, and the density of packet boundaries. The size of the PAG in the center is refined by ~49%, the density of PAG boundaries increased by ~140%, the density of high-angle packet boundaries increased by ~39%, and the density of low-angle packet boundaries increased by ~49%. The crack propagation in the instrumented Charpy impact test of the GTR process showed stable expansion, indicating a ductile fracture compared to the semi-brittle fracture of the UTR process. The densities of PAG boundaries and high-angle packet boundaries are the most important factors affecting the strength and low-temperature toughness.

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“…When the size of the workpiece is large, due to the problem that the workpiece is difficult to bite, this pass reduction is difficult to achieve. Compared with isothermal deformation, when there is a temperature gradient between the workpiece's surface and center, it is easier to eliminate the voids in the workpiece center [5,9,10]. The temperature gradient causes a difference in the deformation resistance between the surface and the core of the workpiece and leads to greater plastic deformation in the billet center.…”

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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Investigation of the Evolution of Central Defects in Ultra-Heavy Plate Rolled Using Gradient Temperature Process

Cited by 19 publications

References 19 publications

Superior Through‐Thickness Homogeneity of Microstructure and Mechanical Properties of Ultraheavy Steel Plate by Advanced Casting and Quenching Technologies

Superior Through‐Thickness Homogeneity of Microstructure and Mechanical Properties of Ultraheavy Steel Plate by Advanced Casting and Quenching Technologies

Effect of a Gradient Temperature Rolling Process on the Microstructure and Mechanical Properties of the Center of Ultra-Heavy Plates

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

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