超薄轧制过程中第二相颗粒与润滑油膜的相互作用机理

发布时间：2018-04-18 19:40

本文选题：Deform-3D + 铝合金箔轧　；参考：《北方工业大学》2017年硕士论文

【摘要】：在铝合金箔材的轧制过程中,铝合金箔材的表面质量主要受到黏度、添加剂含量、和坯料洁净度的影响。与此同时,有的杂质元素是固定存在于工业纯铝中,但有些杂质元素是刻意添加进去的,就像Ti和B是作为晶粒细化剂添加进去的。虽然这些杂质元素的含量很低,但对箔材的各种性能产生影响。在工业纯铝中总是会存在着FeSiAl化合物,在冷轧制过程中几乎不会发生种类、形态和个数的变化,这些会保存到最后的铝合金箔材产品中,但第二相的类型、粒径、形状、区域分布、颗粒数量等却会对材料的强度、加工的性能、耐疲劳性以及耐腐蚀性等性能产生重要的影响。第二相颗粒与润滑油膜之间在箔材轧制的过程中的相互作用还是未知,本文旨在探究在铝合金箔材轧制过程中,第二相颗粒与润滑油膜的相互作用机理。本文的计算基于有限元软件Deform-3D,研究发现当第二相颗粒的硬度值与基体硬度值的比接近的时候(硬度比接近于1),第二相颗粒对位错的阻碍作用类似于位错切割机制。当第二相颗粒的硬度值与基体硬度值的比介于1-6之间时,第二相颗粒对基体的强化机制从位错切割机制向奥罗万强化机制转变。当第二相颗粒的硬度值与基体硬度值的比高于6的时候,第二相颗粒对位错的阻碍运动完全变成了奥罗万强化机制。第二相颗粒在轧制过程中从基体中的暴露时间与颗粒深度呈线性关系,位错机制也会随着第二相颗粒距离基体表面深度的变化而变化,当第二相颗粒距离基体表面较近或是较远时,随轧制的进行第二相颗粒没有破碎。处于2-4 μ m之间的第二相颗粒随着压下量的增加会破碎。
[Abstract]:In the process of aluminum foil rolling, the surface quality of aluminum alloy foil is mainly affected by viscosity, additive content and blank cleanliness.At the same time, some impurity elements are fixed in industrial pure aluminum, but some impurity elements are added deliberately, just as Ti and B are added as grain refiners.Although the content of these impurity elements is very low, it has an effect on the properties of chaff.In industrial pure aluminum, there are always FeSiAl compounds. During cold rolling, there will be almost no change in type, shape and number. These will be preserved in the final aluminum foil products, but the type, size, shape of the second phase,The regional distribution and the number of particles have an important effect on the strength, processing performance, fatigue resistance and corrosion resistance of the material.The interaction between the second phase particle and lubricating oil film in foil rolling is still unknown. This paper aims to explore the interaction mechanism between the second phase particle and lubricating oil film in the process of aluminum alloy foil rolling.Based on the finite element software Deform-3D, it is found that when the hardness ratio of the second phase particle is close to that of the matrix (the hardness ratio is close to 1), the hindrance of the second phase particle to the dislocation is similar to that of the dislocation cutting machine.When the ratio of the hardness of the second phase particle to the matrix hardness value is between 1-6, the strengthening mechanism of the second phase particle to the matrix changes from dislocation cutting mechanism to Orovan strengthening mechanism.When the ratio of hardness value of the second phase particle to that of the matrix hardness value is higher than 6, the hindering movement of the second phase particle's dislocation becomes the mechanism of Orovan strengthening completely.The exposure time of the second phase particle in the rolling process is linearly related to the particle depth, and the dislocation mechanism changes with the change of the depth of the second phase particle from the surface of the matrix.When the second phase particle is near or far from the substrate surface, the second phase particle does not break with rolling.The second phase particles in the range of 2-4 渭 m will break up with the increase of reduction.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG339

【参考文献】