钛合金锻造成形时的微观组织敏感性模型与调控研究

项目名称： 钛合金锻造成形时的微观组织敏感性模型与调控研究

项目编号： No.51205318

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 机械工程学科

项目作者： 罗皎

作者单位： 西北工业大学

项目金额： 26万元

中文摘要： 钛合金是一种微观组织敏感型材料，其微观组织形态决定了锻件的使用性能，影响着锻造成形行为。目前，以试验研究为基础的经验模型和针对等轴晶粒的内变量模型，不能反映钛合金锻造成形时多种微观组织形态的演变行为，因而，难以准确获得钛合金锻造成形过程中的微观组织敏感性信息。本项目通过深入研究多种微观组织形态共存的钛合金锻造成形微观组织演化行为与动态响应特性，建立耦合宏观与微观变形机制的钛合金锻造成形时微观组织敏感性模型，与数值分析相结合，阐明钛合金锻造成形过程中微观组织演变与动态响应规律，提出钛合金锻造成形过程中的微观组织调控方法与准则，解决钛合金锻造成形时的微观组织控制难题，为发展先进锻造成形技术提供理论依据。

中文关键词： 钛合金；锻造；微观组织；敏感性；控制

英文摘要： The microstructure of titanium alloys is sensitive to the processing parameters during the forging process. And the microstructure morphology of titanium alloys greatly affects the mechanical properties and deformation behavior. Nowadays, it is difficult for titanium alloys to acquire accurate sensitivity information of the microstructure using empirical mathematical models and internal-state-variable models based on equiaxed microstructure because these models can not describe the evolution behavior of different kinds of microstructure morphology. In present study, the microstructure evolution and dynamic response characteristics of titanium alloys are investigated in depth during the forging process, in which titanium alloys contain different kinds of microstructure morphology. Moreover, new microstructure sensitivity models of titanium alloys are developed to predict the sensitivity of different kinds of microstructure morphology with respect to processing parameters during the forging process. And the microstructure evolution and the sensitivity law are acquired with the help of numerical analysis. Finally, the appropriate optimality criterion is proposed based on the sensitivity law and used to solve the problem of microstructure control. Present study lays a foundation for developing advance plastic formin

英文关键词： Titanium alloy；Forging；Microstructure；Sensitivity；Control