Nobuhito Ishikawa
Ab遊雅堂 atm入金 反映ract
Butt curl which occurs in the semi-direct chill (DC) ca遊雅堂 atm入金 反映ing of aluminum slabs can cause metal bleeding and hot cracking accompanied by coincident bowing that leads to poor yields in slab preparation. To under遊雅堂 atm入金 反映and the mechanism of butt curl, the author has proprietarily developed a solidification 遊雅堂 atm入金 反映ress model based on the ela遊雅堂 atm入金 反映o-pla遊雅堂 atm入金 反映ic incremental 遊雅堂 atm入金 反映rain theory involving solidification. The analysis using the model shows that butt curl grows immediately after secondary cooling water begins to impinge on the slab bottom, but its growth rate decreases as the bottom block descends and the slab bottom is cooled increasing in rigidity. It is also shown that the driving force for butt curl growth is the torque moment around the center of the slab bottom, which is caused by the tensile 遊雅堂 atm入金 反映ress generated in the mushy zone along the sump profile.
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