钛合金真空自耗电弧熔炼过程的多尺度模拟

Multiscale Modeling of the Vacuum Arc Remelting Process of Titanium Alloy

采用以ANSYS软件建立的有限元模型对Ti6Al4V合金600 mm铸锭真空自耗电弧熔炼过程中的温度场变化以及熔炼电流对熔池形貌的影响进行了研究,并耦合微观模拟的CAFD模型对铸锭几个特征区域凝固前沿的枝晶生长和V元素溶质偏析进行了模拟。结果表明,熔炼电流的增大使熔池深度和糊状区宽度变大,使熔炼达到稳态的时间提前;熔炼达到稳态时,铸锭中心处形成较短而不是十分连续柱状晶组织,二分之一半径处和边部则形成连续的柱状晶组织。

： With the help of the software ANSYS, a finite element model was proposed to simulate the vacuum arc remelting process of a 0600 mm Ti6A14V alloy ingot, and the temperature field variation and effect of melting current on the morphology of molten pool in the process was studied. And then the re- suits were coupled to a microstructure simulating model, namely, the CAFD model, to simulate the den- drite growth and segregation behavior of the element V on the solidification front in several characteristic regions. According to the results, the molten pool becomes deeper and mushy zone becomes wider with the increase of the melting current, so that less time is required to achieve steady state of melting; in the steady state of the melting process, relatively short and discrete columnar dendrites grow in the center of the ingot, while continuous columnar dendrites form in the middle-radius and marginal regions.