基于两相区微观组织的结构及其力学行为的基础上 ,研究了影响两相区变形行为的主要因素·首次将固相率的影响加入到本构方程中 ,并将塑性应变与蠕变应变统一考虑 ,建立了适合于两相区变形的本构方程·同时包括了凝固过程中相变的影响项 ,此本构方程为以后模拟两相区的变形打下了基础 Based on the structure and mechanical behavior of microstructure in two-phase region, the main factors affecting the deformation behavior in two-phase region were studied. For the first time, the influence of solid fraction was added to the constitutive equation, and the plastic strain and creep strain Unified consideration, the constitutive equation suitable for the deformation of the two-phase zone is established, and the influence term of the phase transition in the solidification process is also included. This constitutive equation lays the foundation for simulating the deformation of the two-phase zone in the future