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Microstructural evolution during uniaxial tension-compression in-plane deformation of an IF steel

机译：IF钢单轴拉伸压缩面内变形过程中的组织演变

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摘要

In many metallic materials, load path changes result in Bauschinger effects, i.e., a reduction of yield strength. In this study, we present results of a microstructural investigation on Bauschinger effects in the sheet metal DC06 subjected to in-plane uniaxial loading. We performed tension-compression tests with different values of maximum tensile strains in a novel tool that was especially designed to prevent buckling under compressive loading subsequent to tension. The material exhibits a distinct Bauschinger effect when subjected to the corresponding load path change, which can be rationalized by considering the results of TEM and EBSD investigations on the evolution of dislocation substructures, and of X-ray diffraction measurements of residual stresses, at the different stages of uniaxial loading. Our experimental results clearly show that a combination of different dislocation densities in different grains and back stresses caused by pile-ups of geometrical necessary dislocations leads to the Bauschinger effect observed in the DC06 sheet material.
机译：在许多金属材料中，载荷路径的变化会导致包辛格效应，即屈服强度降低。在这项研究中，我们介绍了在平面内单轴载荷下金属薄板DC06的Bauschinger效应的微观结构研究结果。我们在一种新颖的工具中对不同的最大拉伸应变值进行了拉伸压缩试验，该工具专门用于防止拉伸后在压缩载荷下发生屈曲。该材料在受到相应的载荷路径变化时会表现出明显的包辛格效应，这可以通过考虑TEM和EBSD对位错亚结构演变以及残余应力的X射线衍射测量结果的合理化来合理化。单轴加载的阶段。我们的实验结果清楚地表明，不同晶粒中不同的位错密度和几何必要位错的堆积所引起的背应力的组合，会导致在DC06板材中观察到的鲍辛格效应。

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