挤压速度对Ti_3Al基合金包套挤压过程影响的数值模拟

Numberical Simulation on Effect of Extrusion Speed on Sheathed Extrusion Process of Ti_3Al-Based Alloy

目的研究挤压速度对Ti_3Al基合金包套挤压过程的影响规律。方法利用数值模拟技术在Deform-2D有限元软件中模拟Ti_3Al基合金的包套挤压过程。结果挤压速度越大,坯料及包套的温度和等效应变越高,并且坯料成形的挤压比也越大;在模拟的挤压速度范围内,挤压速度对坯料的等效应力场和模具载荷影响较小。结论选择挤压速度时应使坯料温度和应变速率有良好匹配,这样可以提高坯料成形的均匀性,降低模具载荷以及坯料所受到的应力,为Ti_3Al基合金的包套挤压开坯过程提供参考。

The paper aims to study influence rule of extrusion speed on sheathed extrusion process of Ti3Al-based alloy. The sheathed extrusion process of Ti3Al-based alloy was simulated using numberical simulation technique in Deform-2D finite ele- ment software. The higher the extrusion speed was, the higher temperature and effective strain of billets and sheath were, and the larger extrusion ratio of billets forming was; the extrusion speed had minor influence on equivalent stress field of billets and die load within the scope of simulated extrusion speed. The extrusion speed must be controlled to obtain a good match between temperture and strain rate of billets, so as to further improve and provide reference for sheathed extrusion co^ain~ orocess uniformity of billets forming, reduce die load and stress of billets, of TidAl-based allov.