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3102 3F03微通道扁管

微通道扁管 是汽车空调全铝制微通道换热器的重要组成部分。它们是承载制冷剂的核心部件。它们通常通过挤出制备。热挤压成型的铝扁管在挤压模具的出口处往往存在弯曲和扭曲问题。因此,铝扁管只有在冷轧和上浆后才能用于微通道换热器的组装,

Micro channel flat tubes are an important part of all aluminum microchannel heat exchanger of automobile air conditioner. They are the core component carrying refrigerant. They are often prepared by extrusion. The aluminum flat tube formed by hot extrusion often has bending and twisting problems at the outlet of the extrusion die. Therefore, the aluminum flat tube can be used for the assembly of microchannel heat exchanger only after cold rolling and sizing,  The range of cold rolling reduction in cold rolling sizing is usually 2% ~ 10%. In the assembly of heat exchanger, the process of high-temperature annealing will lead to abnormal large grains in the structure of cold-rolled aluminum flat tube, which will lead to the decline of mechanical properties of aluminum flat tube. By adjusting the cold rolling reduction, the strength of the annealed aluminum flat tube can be changed, and the corresponding annealed aluminum flat tube has the lowest strength  The depression is called the critical depression. For example, the critical downforce of 3102 and 3003 alloy aluminum flat tubes is 4% and 6% respectively.   The critical downforce of aluminum flat tubes of different alloys is determined by the differences of work hardening behavior of alloys. The work hardening behavior of alloy materials is affected by various structural characteristics such as solute atoms, grain size and second phase particles. Compared with 3102 aluminum alloy, 3f03 alloy contains higher concentration of Mn element and has excellent corrosion resistance  In addition to corrosion resistance, it is found that increasing the content of Mn in aluminum alloy is conducive to improving the strength of the alloy through solid solution strengthening. At present, there are few studies on the microstructure characterization and work hardening behavior of 3f03 aluminum flat tube, so it is impossible to compare the differences of work hardening behavior between 3102 alloy and 3f03 alloy. The microstructure evolution of metals during cold rolling and annealing is one of the key issues that have attracted continuous attention in industrial production. It is found that after cold rolling deformation, there is residual strain in the structure in the form of dislocation in the alloy. The dislocation structure remaining in the grain structure determines the evolution behavior of the grain structure in the subsequent annealing process. Due to the different work hardening behavior, different grain structure characteristics will appear in the two alloys during cold rolling / annealing under the same conditions.   (1) the average grain long short axis ratio of 3102 3f03 micro channel flat tubes is 1 5 ~ 1. In the range of 6, the average grain size of 3f03 extruded aluminum flat tube is large. After 5% cold rolling, the grain structure of 3102 aluminum flat tube reinforcement has a high degree of work hardening. After annealing at 600 ℃ / 3 min, abnormal large grains appeared in the microstructure of the two alloy aluminum flat tubes.  (2) the constitutive model with strain strengthening correction term can accurately calculate the stress-strain curve of 3xxx aluminum flat tube material, and can solve the dislocation density and the average free path evolution of dislocations in the process of unidirectional tension.  (3) 3102 micro channel flat tubes have higher Si solid solution concentration and smaller grain size, lower dislocation average free path and higher work hardening rate in the process of plastic deformation. Compared with 3f03 extruded aluminum flat tube, 3102 extruded aluminum flat tube has lower critical downforce.

冷轧施胶中冷轧还原的范围通常为2%~10%。在换热器的装配中,高温退火的过程会导致冷轧铝扁管结构中出现异常大的晶粒,从而导致铝扁管机械性能的下降。通过调整冷轧还原,可以改变退火铝扁管的强度,相应的退火铝扁管具有最低的强度

抑郁症被称为严重抑郁症。例如,3102和3003合金铝扁管的临界下压力分别为4%和6%。

不同合金铝扁管的临界下压力是由合金的加工硬化行为的差异决定的。合金材料的加工硬化行为受溶质原子、晶粒尺寸和二相颗粒等各种结构特性的影响。与3102铝合金相比,3f03合金含有更高浓度的Mn元素,具有优异的耐腐蚀性

除了耐腐蚀性外,还发现增加铝合金中Mn的含量有利于通过固溶强化来提高合金的强度。目前,关于3f03铝扁管的显微组织表征和加工硬化行为的研究很少,因此无法比较3102合金和3f03合金之间加工硬化行为的差异。金属在冷轧和退火过程中的微观结构演变是工业生产中不断受到关注的关键问题之一。研究发现,冷轧变形后,合金中以位错的形式在结构中存在残余应变。晶粒结构中残留的位错结构决定了晶粒结构在后续退火过程中的演化行为。由于加工硬化行为不同,在相同条件下的冷轧/退火过程中,两种合金中会出现不同的晶粒结构特性。

  • (1) 3102微通道扁管3102的平均 晶粒长短轴比为1 5~1。在6的范围内,3f03挤压铝扁管的平均晶粒尺寸较大。5%冷轧后,3102铝扁管增强的晶粒结构具有较高的加工硬化度。在600°C / 3 min下退火后,两个合金铝扁管的微观结构中出现异常的大颗粒。
  • (2)具有应变强化校正项的本构模型可以精确计算出3xxx铝扁管材料的应力-应变曲线,并且可以求解单向张力过程中位错密度和位错的平均自由程演变。
  • (3) 3102微通道扁管 在塑性变形过程中具有较高的Si固溶体浓度和更小的晶粒尺寸,较低的位错平均自由程和较高的加工硬化率。与3f03挤压铝扁管相比,3102挤压铝扁管具有较低的临界下压力。

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