Inconel625大型厚壁管挤压损伤行为仿真

Simulation research of damage behavior of large-scale thick-walled inconel 625 pipe during extrusion process

Inconel625难变形合金大型厚壁管挤压成形过程损伤演变行为,是避免挤压管内外表面裂纹缺陷的重要研究内容。通过建立的基于耦合C&L韧性断裂准则的Inconel625合金大型厚壁管挤压有限元模型,模拟揭示了关键挤压参数坯料初始温度、挤压速度、挤压比、摩擦和凹模半角对挤压过程中损伤的影响规律。结果表明,随着坯料初始温度、挤压速度和挤压比的增大,管材表面最大损伤值减小,可有效防止裂纹缺陷产生;而摩擦和凹模半角的增大,则会增大管材表面产生损伤的趋势,不利于获得无损伤的优质管材。

It is necessary to reveal the damage evolution behavior of the of large-scaled thick-walled Inconel 625 pipe in the extrusion process for protecting the surface crack.Therefore,in this paper,the finite element（FE）model coupled with CL ductile fracture criterion for the extrusion process of large-scale thick-walled Inconel 625 pipe was established,and then the influence mechanism and rules of the key extrusion parameters on the damage of the extruded pipe were revealed.The result shows that with increase of initial billet temperature,extrusion speed and extrusion ratio,the maximum damage of the extruded pipe decreases,which can prevent the crack.With the increase of friction and die taper angle,the maximum damage of the extruded pipe becomes larger,which is infaust to obtain the qualified pipe.