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采用完全热力耦合模型,通过跟踪物质点的真实应变分量计算Zener-Hollomon参数,并由此计算搅拌区内的焊后晶粒尺寸。结果表明:热力影响区和搅拌区边界可以通过材料流动的不同行为进行界定;搅拌区随搅拌针直径的增加而增加,同时热力影响区变窄;在搅拌区域内,应变率对最终晶粒尺寸有明显影响;靠近搅拌针的材料,在快速绕针流动与旋推的作用下,经历了较大的应变率,最终得到较为细小的材料晶粒。
The complete thermomechanical coupling model was used to calculate the Zener-Hollomon parameters by tracking the true strain components of the material points and to calculate the post-weld grain size in the agitation zone. The results show that the boundaries between the heat affected zone and the mixing zone can be defined by the different behaviors of the material flow. The mixing zone increases with the diameter of the mixing rod and the heat affected zone becomes narrower. In the mixing zone, the strain rate affects the final grain size Have a significant effect; near the pin material, under the action of rapid flow around the needle and rotary push, undergone a greater strain rate, and finally get a smaller grain of the material.