Gradation extrusion - Severe plastic deformation with defined gradient
Gradation extrusion - Severe plastic deformation with defined gradient
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DOI：
10.1002/mawe.201200004
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发表时间：
2012-07-01
影响因子：
1.1
通讯作者：
Bergmann, M.
中科院分区：
文献类型：
--
作者：
Neugebauer, R.;Sterzing, A.;Bergmann, M.
在严重塑性变形（SPD）过程中，通常整个材料体积都受到严重变形。生成的细粒度结构建议均匀分布在整个组件中。所得的物理和机械性能在均匀水平上具有比较均匀的分布。提出的研究工作的目标是产生一个定义的非均匀结构，该结构具有与局部荷载相对应的有利性质分布。为此开发了一种新的成形技术——级配挤压成形技术。这种方法是制造具有确定粒度的圆柱形零件的基础，允许物理和机械性能的新局部组合。这项新技术有可能产生一种超细颗粒结构，可以延伸到表面以下几毫米深。该层的特点是强度增加，而内部材料具有粗晶结构，具有良好的延展性。这样的属性组合对于许多实际应用具有很高的相关性。所提出的技术方法可以弥补全体积精炼方法和表面精炼方法之间的差距。
In Severe Plastic Deformation (SPD) processes usually the whole material volume is subjected to the severe deformation. The generated fine-grained structure is proposed to be uniformly distributed throughout the component. The resulting physical and mechanical properties have a comparatively even distribution at a homogeneous level. The goal of the presented research work is to generate a defined inhomogeneous structure with advantageous property distributions corresponding to local loads on the component. The new forming technology gradation extrusion has been developed for this purpose. This method is the base for the manufacture of cylindrical parts with a defined gradation of the grain size allowing new local combinations of physical and mechanical properties. The new technology has the potential to produce an ultrafine-grained structure which can extend up to several mm deep below the surface. This layer is characterized by an increased strength while the inner material with a coarse grained structure has excellent ductility. Such a property combination has a high relevance for many practical applications. The presented technological approach can bridge the gap between methods refining the complete volume and methods of surface refinement only.