摘要
High strength β titanium alloys are widely used in large load bearing components in the aerospace field. At present, large parts are generally formed by die forging. Different initial microstructures and deformation process parameters will significantly affect the flow behavior. To precisely control the microstructures, researchers have conducted many studies to analyze the microstructure evolution law and deformation mechanism during hot compression. This review focuses on the microstructure evolution of high strength β titanium alloys during hot deformation, including dynamic recrystallization and dynamic recovery in the single-phase region and the dynamic evolution of the α phase in the two-phase region. Furthermore, the optimal hot processing regions, instability regions,and the relationship between the efficiency of power dissipation and the deformation mechanism in the hot processing map are summarized. Finally, the problems and development direction of using hot processing maps to optimize process parameters are also emphasized.
高强度β钛合金广泛应用于航空领域的大型承重部件。目前,大型零件一般采用模锻成型。不同的初始显微组织和变形工艺参数会显著影响流动行为。为了实现显微组织的精确控制,研究人员进行了大量的研究工作去分析热压缩过程中的组织演变和变形机制。本文重点综述高强度β钛合金在热变形过程中的组织演变,包括单相区的动态再结晶和动态回复,以及两相区中α相的动态演变。此外,总结热加工图中的最佳热加工区域、不稳定区域以及功率耗散效率与变形机制之间的关系。最后,强调利用热加工图优化工艺参数存在的问题和发展方向。
基金
supported by the Project of National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, China (No. 6142909190207)
Shaanxi Key Laboratory of High-performance Precision Forming Technology and Equipment (SKL-HPFTE), China (No. PETE-2019-KF-01)。
