涡轮盘是航空发动机的核心关键零件，质量要求严格，制造难度大。通过锻造等热加工获得具有均匀细晶组织的锻件是涡轮盘制造的关键环节。然而，目前采用普通模锻成形的涡轮盘锻件存在严重的粗晶/混晶缺陷，从而导致材料利用率低和产品品质不达标。本项目针对该技术瓶颈，提出应用delta相影响的静/亚动态再结晶机制均匀细化锻造混晶组织的新方案。拟开展如下研究：(1)研究涡轮盘材料预处理、模锻成形和再结晶热处理过程中delta相、晶粒组织与位错能演变行为与建模，揭示通过静态/亚动态再结晶热处理消除粗晶和混晶的机制，提出通过调控delta相含量促进再结晶形核与抑制晶粒长大的细晶方法；(2)建立时效预处理—锻造变形—再结晶热处理全过程的组织演变仿真模型，阐明微观组织在模锻成形和再结晶热处理过程中的遗传演化规律；(3)形成涡轮盘锻件组织均匀细化的调控原理与技术，为制备高品质涡轮盘锻件提供理论基础与技术支撑。

Turbine disk is one of key parts of aero-engine. To achieve the high performance, it is important to obtain the turbine disk forgings of which the grain sizes are small and uniform. However, there are some serious coarse and mixed grains in turbine disk forgings formed by die forging. It results in a low material utilization and product quality. Therefore, a new method, i.e., “die forging and recrystallizing heat treatment”, is proposed in this application to refine the coarse and mixed grains in turbine disk forgings. The main research contents are as follows: (1) The evolution of delta phase, grain and dislocation energy during hot die forging and heat treatment of turbine disk forgings; and the method to gain the fine and uniform grains though control the content of delta phase which can promote the nucleation of recrystallized grains and inhibit the grain growth. (2) Establishment of a simulation model which can describe the microstructural evolution in the whole process of solid solution, aging treatment, forging and recrystallizing heat treatment. (3) Control principle and technology to refine the grains of turbine disk forgings. The study will provide the theory base for obtaining the turbine disk forgings with high performances.