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Grain refinement in the surface layer of metallic materials by means ofmachine hammer peening (FinePeening)

通过机锤喷丸（FinePeening）细化金属材料表层晶粒

基本信息

批准号：
326729428
负责人：
Professor Dr.-Ing. Thomas Bergs, since 7/2019
金额：
--
依托单位：
Werkzeugmaschinenlabor - WZL
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/326729428?language=en
关键词：
Grain refinement surface layer metallic

项目摘要

Metallic materials with a fine-grained microstructure have better mechanical properties as in a coarse-grained state. An increase of strength, fatigue strength, wear, and corrosion resistance of fine grained metallic materials has already been proven experimentally. Therefore, the grain refinement of metallic materials is a promising approach to significantly improve their mechanical properties.The surface layer is often the most loaded zone of technical components. Due to this fact a local grain refinement in the surface layer improves the performance of the complete component. A grain refinement in the surface layer can be achieved through severe plastic deformation (SPD) by means of mechanical surface treatment. Machine hammer peening (MHP) is an industrially used process for mechanical surface treatment of highly loaded technical components.A smoothening oft the surface asperities, strain hardening, and induction of compressive residual stresses in the surface layer are achiever by means of MHP. Furthermore, MHP structures to improve the tribological characteristics of the surfaces can be produced. Both mentioned aspects were in the focus of previous research in the field of MHP. Furthermore, MHP is a potentially suitable technology for a generation of a fine-grained surface layer. However, there exist no explanation models with regard to the process parameters of MHP and the resulting grain refinement in the surface layer.In order to enable a goal-oriented industrial implementation of MHP for the grain refinement, basic cause-and-effect relationships between the MHP process parameters and the resulting grain refinement in the surface layer must be explained. Furthermore, the influence of the fine-grained surface layer of MHP treated components on the wear and fatigue strength is to be characterized.

具有细晶微观结构的金属材料具有比粗晶状态更好的机械性能。细晶粒金属材料的强度、疲劳强度、耐磨性和耐腐蚀性的提高已被实验证明。因此，金属材料的晶粒细化是显着提高其机械性能的一种有前途的方法。表面层通常是技术部件负载最大的区域。因此，表面层的局部晶粒细化提高了整个部件的性能。通过机械表面处理的剧烈塑性变形（SPD）可以实现表面层的晶粒细化。机锤喷丸 (MHP) 是一种工业上用于对高负载技术部件进行机械表面处理的工艺。通过 MHP 可以实现表面粗糙度的平滑、应变硬化以及在表面层中产生压缩残余应力。此外，还可以生产改善表面摩擦学特性的 MHP 结构。这两个方面都是 MHP 领域先前研究的重点。此外，MHP 是一种潜在适合生成细粒度表面层的技术。然而，目前还没有关于MHP工艺参数和由此产生的表层晶粒细化的解释模型。为了使MHP晶粒细化能够以目标为导向的工业实施，必须解释MHP工艺参数和由此产生的表层晶粒细化之间的基本因果关系。此外，还需要表征经过 MHP 处理的部件的细晶粒表面层对磨损和疲劳强度的影响。