本项目旨在传统电渣重熔理论和技术基础上，探索电渣重熔制备大型镍基合金锭的新方法，采用单电源双回路导电结晶器的方式重熔，以改善大型镍基合金锭的凝固条件、解决铸锭凝固质量和表面质量之间相互矛盾的可行性，揭示其工艺参数对铸锭内部凝固质量和表面质量的影响机制。建立基于导电结晶器条件下电渣重熔大型镍基合金锭的凝固数学模型，通过电磁场、流场、温度场的模拟分析，弄清镍基合金锭中易偏析元素的扩散、迁移行为规律及其控制机理。开展对电渣重熔镍基合金用渣系物理化学性质的研究，解决镍基合金电渣重熔过程中元素烧损，铸锭头尾成分不均的问题，且该渣系适合于抽锭电渣重熔工艺。建立电渣重熔镍基合金过程渣系及合金成分关系的动力学模型，为制备高均匀度的镍基合金铸锭提供理论基础。通过上述研究，建立大型镍基合金铸锭制备新方法，为生产满足国家重大工程和重大装备所需的大型和超大型镍基合金材料奠定理论基础。

The purpose of this project is to explore a new electroslag remelting withdrawing(ESRW) method for production of large nickel base alloy ingots by means of double circuit of current supply and current conductive mold with a single power supply in order to improve the solidification condition, solve the contradictory relation between solidification quality and surface quality of the large nickel base alloy ingot, and reveal the mechanism on the effect of process parameters on surface quality and internal solidification quality of the ingot, on the basis of traditional ESR theory and technology. The rules of diffusion and movement of easily segregated elements, and the control mechanism will be found, through the simulation analysis of the electromagnetic field, flow field and temperature field based on the solidification mathematical model during the ESR process of large nickel base alloy ingot with the usage of current conductive mold. The physical chemistry of ESR slags which will be used in withdrawing ESR of nickel base alloys, in order to solve the problem of easily oxidized elements losses and nonuniform composition from top to bottom during the ESR　process of nickel base alloy. In addition, ａdynamic mathematical model for prediction of relationship between slag and alloy composition in the ESR process of nickel base alloy, in order to provide the theoretical basis for the production of high-level uniform composition nickel base alloy ingot. Finally, a new method for munafactureing large nickel base alloy ingot will be established to provide the theoretical basis for the production of large and super large nickel base alloy materials which meet the requirements of national major engineering projects and major equipment.