大规格钛扁锭凝固过程的非稳态数值计算研究

Research on Unsteady Numerical Calculation of Large Size Titanium Ingot during Solidification Process

在大规格钛扁锭半连铸过程中,固相分数和熔池形貌对得到优质钛锭有着重要影响。本文以有限元为基础,采用数值模拟计算方法对大规格钛扁锭半连铸过程进行非稳态计算,重点研究了不同生产工艺条件对固相分数和熔池形貌的影响。研究表明,随着浇注温度和拉锭速度的增加,固相分数和熔池形貌变化区域的长度呈线性减小,钛锭熔池深度和钛锭1/4处熔池的深度呈线性增加。相对于浇注温度,拉锭速度对固相分数的影响更为显著。

In the semi-continuous casting process of large size titanium ingot, the solid fraction and the molten poolmorphology have an important impact on forming high quality titanium ingot. Based on the finite element method and usingnumerical simulation method, unsteady numerical calculation of large size titanium ingot during solidification process wascarried out, the effects of different process conditions on solid fraction and molten pool morphology were studied. The resultsshow that with casting temperature and pulling speed increasing, solid fraction and length of the region in which molten poolmorphology changes obviously decrease linearly, the depth of molten pool and the depth of 1/4 of molten pool increaselinearly. Compared with casting temperature, the effect of pulling speed on solid fraction is more significant.