TC18钛合金盘件等温模锻过程有限元模拟及试验

摘要

Arrhenius constitutive relationship of TC18 Ti alloy obtained from thermal simulation test was used to simulate the isothermal die forging of reduced-scale TC18 disc by finite element method. The suitable deformation conditions were obtained and applied to guide the experiment through systemically investigating the influence of deformation temperature, rate and friction factor on the isothermal die forging process. The result show that the suitable isothermal die forging conditions are that the temperature is 840℃, rate is 0.1 mm/s and friction factor is 0.03. The TC18 Ti disc is successfully fabricated under the guidance of finite element simulation, while the accuracy of simulation is also verified by the forging experiment. The related investigation can provide the numerical and technological support for other complex components.%通过热模拟试验建立TC18合金的Arrhenius型本构关系，采用有限元模拟方法系统研究变形温度、变形速率和摩擦因数等因素对TC18缩比盘件等温模锻过程的影响，从而得到该合金较合理的模锻工艺条件，并用于指导具体试验。结果表明：变形温度840℃、变形速率0.1 mm/s、摩擦因数0.03为该合金较合理的等温模锻变形条件；在有限元模拟工艺的指导下成功锻造出该合金盘件，并验证有限元模拟结果的正确性；同时，为其他钛合金复杂件的等温模锻工艺提供数值依据与技术指导。