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采用实验和数值建模方法探究微成形中材料变形行为和晶粒变形行为的关系。拉伸实验结果表明,流动应力的离散度随厚度晶粒尺寸比(T/d)的减小而增大,这与流动应力的变化规律相反。显微硬度测试结果表明,每个晶粒都有其独特的变形行为且随机分布于试样中。含晶粒数量越少的试样越容易形成易变形区和发生变形集中现象。最后,建立了一个同时考虑晶粒尺寸、几何尺寸和个体晶粒变形行为的尺寸依赖模型,并通过对比实验证实了该模型的有效性和实用性。
The relationship between deformation behavior and grain deformation behavior in micro-forming was investigated by means of experiments and numerical modeling. Tensile test results show that the dispersion of flow stress increases with the decrease of the thickness grain size ratio (T / d), which is opposite to the variation of flow stress. Microhardness test results show that each grain has its own unique deformation behavior and randomly distributed in the sample. The smaller the number of grains, the easier the sample is to form a deformable zone and deform the concentration phenomenon. Finally, a dimensional dependence model considering both the grain size, the geometric size and the individual grain deformation behavior was established. The effectiveness and practicability of the model were verified through comparative experiments.