针对钛合金加工中切削应力大、切削温度高易造成刀具寿命短、可靠性低和加工效率低等问题，亟待开展适应钛合金高速切削使役环境的新型梯度功能刀具的设计制备研究。项目基于微波烧结，重点研究微波与刀具材料的相互作用规律，揭示梯度刀具材料微波烧结致密化机理；研究梯度刀具由表及里的力学性能演变和高温力学行为规律，阐明表层硬化、亚表层韧化和基体强化的关联性，揭示表层耐磨损行为、亚表层抗剥落行为和基体抗断裂行为间交互作用；评价钛合金高速切削极端环境下梯度功能刀具的切削使役性能，分析梯度结构对载荷传递、应力分布和裂纹扩展的作用机理。项目旨在突破梯度功能刀具材料的微波烧结致密化机理这一瓶颈问题，揭示梯度功能刀具高温力学行为与切削使役性能间的映射关系，为新型刀具组分和结构的逆向设计提供理论指导。项目可在钛合金高速切削用梯度功能刀具的设计制备上取得突破，对高速切削刀具技术的发展具有重要的理论与实际意义，应用前景广泛。

During the cutting process of titanium alloys, high cutting stress and high cutting temperature result in some questions, such as short tool life, low tool reliability, and low processing efficiency. Therefore, it is necessary to design and prepare a new gradient functional cutting tools which is suitable for titanium alloy high-speed machining environment. Based on the advantages of microwave sintering technology, the interaction between microwave and cutting tool material will be studied detailly, and the mechanism of microwave sintering of gradient cutting tool material will be revealed. By studying the mechanical properties and high temperature mechanical behavior of the gradient cutting tool, the relationships between surface hardening, subsurface toughening and substrate strengthening will be clarified and the interaction effects of surface wear resistance, subsurface peeling resistance and matrix fracture resistance will be revealed. The correlation between tool gradient microstructure, mechanical behavior and cutting performance during the high-speed machining of titanium alloys will be studied, and the mapping model of mechanical behavior at high cutting temperature and cutting performance will be established. The project is expected to solve bottlenecks of microwave sintering densification mechanism of gradient cutting tool materials. The effect mechanism of gradient structure on load transfer, stress distribution and crack propagation will be analyzed. It will provide theoretical guidance for the reverse design of tool components and structures. The project can make a breakthrough in the design and preparation of gradient functional cutting tools for the high-speed machining of titanium alloys, and provide a strong guarantee for the efficient manufacturing of advanced equipment such as aerospace. Therefore, it has important theoretical and practical significance and wide application prospect.