链式异型坯结晶器内浇钢过程热-力学数值模拟

THERMO-MECHANICAL NUMERICAL SIMULATION OF BEAM BLANK STEEL CASTING IN CHAIN PLATE MOULD

通过建立二维热．力耦合分析有限元模型，研究了一种新型链式异型坯结晶器内浇钢过程凝固坯壳与结晶器铜板间的热一力学状态。揭示了该结晶器链板和结晶器内铸坯的温度场与应力场。结果表明，铜板热面最高温度出现在弯月面以下150～300mm，以腹板位置温度为最高，达198．2℃；冷面最高温度出现在翼缘中心位置，约为115℃，冷面其他位置温度在100℃以下，冷面喷淋状态良好。在10m／min的拉速下，结晶器弯月面下200mm处开始生成固相坯壳，结晶器出口处腹板中心位置开始进入两相区。计算结果对该链式异型坯结晶器的设计及其连铸工艺的优化具有一定指导意义。

A 2-D coupled thermal and mechanical finite element model for thermo-mechani cal state between strand and mold in chain plate mold was presented for the simulation of steel casting. The thermo-mechanical behavior of both the steel strand and chain plate mold was revealed. It was showed with the calculated temperature field and stress field that the maximal temperature at the plate hot side was located below the meniscus from 150 mm to 300 mm, which was about 198.2 ℃ at the fillet center. The maximum temperature of the plate cold side was around 115 ℃ at the centre region of the wings, while the temperature of other part of the cold side was all below 100 ℃. At casting speed of 10 m/min, the solidified shell began to develop from 200 mm below the meniscus. Mushy zone appeared in the fillet center at the mould exit.