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首页> 外文期刊>Journal of Materials Processing Technology >Integrated physical and numerical simulations of weld seam formation during extrusion of magnesium alloy
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Integrated physical and numerical simulations of weld seam formation during extrusion of magnesium alloy

机译：镁合金挤出过程中焊缝形成的集成物理和数值模拟

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Solid-state bonding takes place during the extrusion process to produce a hollow metal profile through a porthole die, known as extrusion welding. Defective weld seams degrade extruded products in mechanical properties. The present research was aimed to determine the effect of extrusion condition on the longitudinal weld seam quality of a magnesium alloy, Mg-8Al-0.5Zn-0.5RE, using an integrated physical and numerical simulation method. A special die set-up for physical simulation was designed, through which two magnesium alloy rods were welded in the solid-state under high hydrostatic pressure. Extrusion welding experiments under different conditions were performed. It was demonstrated that, with this die set-up, the formation of weld seams during extrusion to produce hollow profiles could be physically simulated. The extrusion welding experiments were then numerically simulated to reveal strains, stresses and hydrostatic pressures that could not be experimentally measured. Finally, the tensile strength and elongation of the extrusion-welded magnesium alloy were determined and its microstructure was examined. The results showed that the bonding strength increased with decreasing extrusion speed and rising extrusion temperature. For well-bonded rods, weld seam was invisible under optical microscope. Attributed to high temperature and large equivalent strain, complete dynamic re crystallization occurred across the interface, leading to a reduced average grain size and disappearance of weld seam. By applying the integrated physical and numerical simulation method, extrusion process parameters for a particular magnesium alloy can be optimized to ensure weld seam quality of extruded hollow profiles.
机译：在挤出过程中发生固态粘合，以通过舷窗模具生产中空金属型材，称为挤出焊接。有缺陷的焊缝在机械性能下降低挤出产品。本研究旨在使用集成物理和数值模拟方法确定挤出条件对镁合金，Mg-8A10.5Zn-0.5re的纵向焊缝质量的影响。设计了物理模拟的特殊模具设置，通过在高静水压力下，在固态中焊接两个镁合金棒。进行不同条件下的挤出焊接实验。据证明，通过该模具设置，可以物理模拟挤出以产生中空分布期间的焊缝的形成。然后在数值上模拟挤出焊接实验以揭示无法通过实验测量的菌株，应力和静压压力。最后，测定挤出焊接镁合金的拉伸强度和伸长率，并检查其微观结构。结果表明，粘合强度随着挤出速度和上升挤出温度的降低而增加。对于良好的粘合棒，焊缝在光学显微镜下是不可见的。归因于高温和大量的等效应变，在界面上发生完整的动态RE结晶，导致焊缝的平均晶粒尺寸和消失。通过应用集成的物理和数值模拟方法，可以优化特定镁合金的挤出工艺参数，以确保挤出空心型材的焊缝质量。

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