Thermal optimization of secondary cooling systems in the continuous steel casting process

Pourfathi, A.; Tavakoli, Rouhollah

doi:10.1016/j.ijthermalsci.2022.107860

Cited by 12 publications

(2 citation statements)

References 56 publications

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“…The intervention of an external stress field forces the flow of the un-solidified liquid phase for forced feeding. The criterion formula for predicting shrinkage porosity on the basis of the Niyama criterion [ 32 ] is as follows:

where

is the viscosity coefficient of the liquid phase,

is the liquid fraction,

is the solidification shrinkage,

is the temperature difference of the solidus-liquidus temperatures,

is the gravitational acceleration,

is the correction coefficient, and

is the pressure difference.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Local Pressurization on Microstructure and Mechanical Properties of Aluminum Alloy Flywheel Housing with Complex Shape

Chen,

Ge,

Jiang

et al. 2023

Materials

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In this work, squeeze casting experiments of flywheel housing components with a large wall thickness difference and a complex shape were carried out with AlSi9Mg aluminum alloy. The defects, microstructures, and mechanical properties under different process parameters were investigated. Furthermore, the local pressurization process was applied to the thick-walled positions to force-feed the cast defects. The mechanical properties and microstructures at these positions were analyzed. The results showed that the surface quality of formed components was good and that local pressurization could effectively reduce the shrinkage cavity and shrinkage porosity in thick walls, but the scope and effect of forced feeding were limited. The optimum process parameters were a pouring temperature of 650 °C, a specific pressure of 48 MPa, a mold temperature of 220 °C, a local pressurization of 800 MPa, and pressure delay times of 15 s (side A) and 17 s (side B). The ultimate tensile strength, yield strength, and elongation of the formed component under validation experiments of the optimum process parameters were 201 MPa, 103 MPa, and 5.1%. Meanwhile, the fine grains of primary α-Al were mainly rosette and equiaxed grains, and the average grain size was about 40 μm. The microstructure of the eutectic silicon was acicular and was prone to segregation under pressure. According to profile morphology, the positions after pressurization were divided into a deformation zone, a direct action zone, and an indirect action zone. The coexistence of as-cast and plastic deformation microstructures was observed. The effect of local pressurization mainly involved a change in the solidification process, plastic deformation, and forced feeding.

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