为有效利用冷坩埚,更优控制工艺参数,获得良好冶金质量的铸棒,计算了冷坩埚连续熔铸与定向凝固Ti6A14V温度场,对冷坩埚熔凝条件下的边界条件、驼峰和运动单元作相应处理.计算结果表明:在52 kW,抽拉速度为1.2、3、4.8、6 mm/min时,随抽拉速度增加,送料棒熔化量减小,驼峰过热度变小,凝固界面位置下移,形状变凹;抽拉速度为1.2 mm/min时为平凝固界面.在抽拉速度为3 mm/min,功率为44、48、52 kW和56 kW时,随功率增大,送料棒熔化区域变大且过热度增加,驼峰体积增大且过热度增加,凝固界面位置下移,形状变凹;48 kW时为平凝固界面.工艺参数对凝固界面的影响计算结果与实验结果基本一致.
In order to make use of cold crucible efficiently, optimize parameters and obtain billet with high quality, temperature fields of continuous melting and solidification of Ti6A14V with cold crucible were calcu-lated, and corresponding boundary conditions, liquid meniscus and moving cell were set up. Calculation re-sults show that, at the velocity of 1.2, 3, 4. 8 and 6 mm/min under the power of 52 kW, the volume of feed-ing billet that can be melt and the superheat degree of meniscus is decreased with the increase of velocity, the position of solidification front is lowered and the shape becomes concave. Planar solidification front can be ob-tained at velocity of 1.2 mm/min. For the power of 44, 48, 52 and 56 kW at the velocity of 3 mm/min, the volume of feeding billet can be melt and the superheat degree of meniscus is increased with the increasing pow-er, the position of solidification front is lowered and its shape becomes concave. Planar solidification front can be obtained at 48 kW. Calculation results of the effect of processing parameters on the solidification are in good agreement with experimental data.
参考文献
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