In718合金反挤压成形数值模拟

Numerical Simulation of Inconel718 Hot Backward Extrusion

本文基于粘塑性材料模型,应用有限元模拟技术对In718合金高温下的反挤压成形过程进行了数值模拟。分析了不同挤压工艺的金属流变行为和应力应变分布,得出:在高温条件下,In718合金进行等温反挤压,成形质量较好;摩擦不仅降低反挤压成形范围,并且加剧金属表面裂纹的产生;坯料的等效应力分布较均匀,最大等效应力值出现在凸模工作带端点处;无摩擦、凸模球心夹角=60°、反挤压成形温度T=1000℃时得到的等效应变值比较均匀,产品成形质量相对较好。

Finite Element method has been used to simulate hot backward extrusion process of Inconel718 alloy upon viscoplasticity model. The distribution of Von-Mises stress equivalent and strain equivalent and velocity at different extrusion processing have been analyzed, resulting in that inconel718 alloy had better extrusion quality at high temperature ;friction not only created cracks but also reduced the deforming range;the maximum stress equivalent appeared on the termination point of male die round-angle. In a word, In718 alloy had the better ability of extrusion with male die with 60°included angle and without friction at 1000℃ temperature.