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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。
Inconel625 hardfacing alloy large thick-walled tube during the extrusion damage evolution behavior is to avoid cracks in the extrusion tube surface defects of important research. Based on the finite element model of Inconel625 large-wall thick-walled tube extruded with established C & L ductile fracture criterion, the simulation reveals the critical extrusion parameters such as initial temperature, extrusion speed, extrusion ratio, friction and die half-angle to extrusion process The impact of the law of injury. The results show that with the increase of the initial temperature, extrusion speed and extrusion ratio, the maximum damage value of the pipe surface can be reduced, which can effectively prevent the occurrence of crack defects. However, the increase of the half-angle of the friction and die will increase the pipe The tendency of the surface to produce damage is not conducive to obtaining good quality tubing without damage.