关键词: 电渣重熔, 数学模型, 控制容积积分, 附加源项, 熔池深度, 熔铸速度

Abstract: To investigate the effect of solidification process on electroslag remelting (ESR) ingots's quality, a dynamically fast response model has been developed for large-size ESR ingots in their solidifying processes. In the modeling process, the control-volume method is introduced to discretize the algebraic equations, and the added source term method is used to solve the rapidly iterative convergence problem of a non-linear model. The temperature field and pool shape predicted with the model conform well with the experimental results. Based on the model, a simulation was conducted for the dynamic temperature distribution and pool shape in the solidification process of a typical large-size ESR ingot. The results showed that the pool shape will basically be kept stable if the ingot's height increases linearly and its aspect ratio is over 1:1. The casting rate doesn't affect much the max. depth of pool if the rate is low, but will be more obviously if the rate increases.