Mathematical Modeling on Deformation Behavior of Solidified Shell in Continuous Slab Casting with Soft Reduction

摘要

Based on the calculation results of the two-dimensional unsteady heat transfer model for continuous slab casting with soft reduction process, a coupled thermo-elastic-plastic mathematical model has been developed to study the effects of the reduction amount and solid phase fraction in slab centerline on the deformation behavior of solidification shell in this paper. The calculated results show that the displacement along thickness direction of slab changes little in width center region of slab when the reduction amount keeps constant, then it increases and a peak of displacement appears in 0.075 m whose distance is far from the slab narrow face, finally, it decreases severely near the narrow face of slab. When the solid phase fraction is the same, the displacement of solidification shell toward to the width and thickness direction of slab increases with the increasing of reduction amount. When the solid phase fraction is 0.3, the reduction amount in reduction subzone is 0.15 mm and 0.25 mm, respectively, the effective reduction efficiency decreases from 0.463 to 0.436. When the total reduction amount is 5 mm, the solid phase fraction varies from 0.3 to 0.7, the accumulated displacement of solidification front increases from 0.238 mm to 0.805 mm, the reduction efficiency decreases from 0.46 to 0.32.