结晶器溢流口位置对电子束熔炼钛锭凝固过程的影响

The Influence of Crystallizer's Overflow Position on the Titanium Electron Beam Cold Hearth Solidification Process

使用有限元方法模拟计算电子束冷床熔炼大规格钛锭稳态连铸凝固过程中温度场流场耦合行为,分析结晶器溢流口位置对大规格钛锭凝固过程的影响。结果表明:当工艺条件相同时,流场耦合温度场后会导致凝固界面形貌不规则,糊状区体积增加;当溢流口的位置不在结晶器内宽面正中间时,相对于溢流口另一边的熔池深度会降低;溢流口位置的变化对固相率的影响不大,但是对凝固界面的影响较大,当溢流口位置位于钛锭熔池表面中心时熔池和凝固界面更加均匀和平稳。

The model of large scale electron beam cold hearth melting titanium ingot steady state model with the finite element method was established, and the influence of crystallizer＇s overflow position on titanium electron beam cold hearth solidification process was analyzed under the condition of the coupled temperature field and the flow field. The results show that： with the fixed technological parameters, the solidification process will become irregular and mushy zone increase when the flow field is coupled with temperature field, the molten depth will decrease on the opposite side of the inlet position when the overflow is not on the center of the ingot molten surface; the effect of overflow position on the solidification interface is obvious, but no obvious on the solid fraction, the molten pool and solidification interface will be more steady and balanced when the overflow on the center of the ingot molten surface.