本文在分析强烈塑性变形（ severe plastic deformation）对金属材料组织性能影响的基础上，进一步研究金属材料经过反复塑性弯曲变形后，其内部组织性能的变化规律。以H85黄铜板材为对象，采用MARC有限元等方法计算不同弯曲半径与板厚之比（ r／h，简称：径厚比）对金属材料内部累积应变的影响，同时通过金相组织分析和显微硬度测定，进一步确定其内部晶粒尺寸的变化规律。研究表明，金属板材经过反复塑性弯曲变形后，其内部累积应变量大小沿厚度分布随离中性层距离增加而增大、晶粒尺寸则随之变小、金属的显微硬度随之增加。而且随着径厚比（ r／h）减小，其累积应变量效应越显著。
Based on the analysis of influence of severe plastic deformation on metal microstructure and properties, the changes of internal microstructure and properties of metals after the repeated bending deformation were further studies in this article. We take H85 brass plate as the research object, use the Marc finite element analysis software to calculate the effect of different ratio of curvature radius to plate thickness ( r/h) on metal accumulation strain. After that, we further study the changing law of grain size by analyzing microstructure and calculating its microhardness. Results shows that, after repeating plastic bending deformation, the cumulative strain increases, the grain size becomes smaller and the metal microhardness increases with the increasing the distance from the neutral layer. And as the diameter to thickness ratio ( r/h) decreases, the cumulative effect of the variable is more significant.
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