金属箔材轧制过程中第二相颗粒的尺寸效应研究

发布时间：2018-03-21 11:46

本文选题：金属箔材　切入点：第二相颗粒　出处：《华中师范大学学报(自然科学版)》2017年06期 　论文类型：期刊论文

【摘要】：金属箔材轧制时,箔材的厚度最小为几个微米.微米级甚至是亚微米量级尺寸的第二相颗粒都可能对基体的力学性能,甚至是箔材的表面形状造成影响.相对于基体而言,颗粒的软硬程度及其大小对轧制过程中箔材的影响是截然不同的.该文通过有限元模拟的方法研究了单个的硬质及软质第二相颗粒对箔材基体性能及形状的影响.论文中引入参量:颗粒直径/箔材厚度比(以下简称d/T).结果表明,箔轧时,相较于硬质颗粒而言,不同尺寸的软质颗粒对箔材的影响较大.第二相颗粒为软质颗粒时,应力集中程度及箔材表面变形程度随着颗粒尺寸的增大而增大,当d/T小于1/20时,第二相颗粒周边基体应力集中现象不明显;当d/T为1/20~1/5时,应力集中比较明显,箔材表面发生轻微变形;当d/T大于1/5时,基体中应力集中明显,箔材表面变形严重.第二相颗粒为硬质颗粒时,随着d/T的增加应力集中现象越不明显,基体表面几乎没有变形.
[Abstract]:When metal foil is rolled, the minimum thickness of foil is several microns. Second phase particles of micron or submicron size may affect the mechanical properties of the matrix and even the surface shape of the foil. The effect of soft and hard particles and their size on the properties and shape of foil in rolling process is very different. In this paper, the effect of single hard and soft second phase particles on the properties and shape of foil matrix is studied by finite element simulation. . the paper introduces the parameter: particle diameter / foil thickness ratio (d / T). The results show that, In foil rolling, different sizes of soft particles have a greater effect on foil than hard particles. When the second phase particles are soft particles, the degree of stress concentration and the deformation of foil surface increase with the increase of particle size. When D / T is less than 1/20, the stress concentration in the matrix around the second phase particle is not obvious. When d / T is 1 / 20 / 1 / 5, the stress concentration is obvious and the surface of foil is slightly deformed. When d / T is greater than 1/5, the stress concentration in the matrix is obvious. When the second phase particles are hard particles, the stress concentration is less obvious with the increase of D / T, and there is almost no deformation on the matrix surface.
【作者单位】：北方工业大学机械与材料工程学院;
【基金】：国家自然科学基金项目(51675007) 北京市长城学者项目(CIT&TCD20140301)
【分类号】：TG331

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