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首页> 外文期刊>Materials Science and Engineering >Prediction of flow stress and surface roughness of stainless steel sheets considering an inhomogeneous microstructure
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Prediction of flow stress and surface roughness of stainless steel sheets considering an inhomogeneous microstructure

机译：考虑不均匀组织的不锈钢薄板流动应力和表面粗糙度的预测

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摘要

The aim of this study is to model the mechanical behavior of ultra-thin sheets of stainless steel taking into account the heterogeneous distribution of the mechanical properties of the grains. EBSD analysis and micro-hardness measurements are performed to characterize the grain size and shape as well as the local hardness distribution. A finite element model of a representative volume, based on the grain size distribution and Vorono polyhedrons, is developed using the dedicated free software Neper and the material inhomogeneity is introduced via a discrete distribution of the flow stress of the grains. Four different flow stress distributions are considered, by changing either the flow stress range or the corresponding volume fractions. A uniaxial tensile test of the representative volume is simulated and compared to experimental data. Then, the influence of the grain heterogeneity on the hysteresis of loading-unloading sequences in tension and on the Bauschinger effect in simple shear is investigated numerically and compared with experiments. In particular, it is shown that the type of the flow stress distribution influences significantly the magnitude of the Bauschinger effect. Finally, the surface roughness is characterized numerically both in tension and simple shear and is shown to reproduce faithfully the experimental values.
机译：这项研究的目的是考虑到晶粒力学性能的不均匀分布，对超薄不锈钢板的力学行为进行建模。进行EBSD分析和显微硬度测量以表征晶粒尺寸和形状以及局部硬度分布。使用专用的免费软件Neper，基于晶粒尺寸分布和Vorono多面体，开发了具有代表性的体积有限元模型，并通过晶粒流动应力的离散分布引入了材料不均匀性。通过更改流应力范围或相应的体积分数，可以考虑四种不同的流应力分布。模拟了代表体积的单轴拉伸试验，并将其与实验数据进行了比较。然后，数值研究了晶粒异质性对拉伸中加载-卸载序列的磁滞的影响以及对简单剪切中的鲍辛格效应的影响，并与实验进行了比较。特别地，示出了流动应力分布的类型显着影响包辛格效应的大小。最后，在粗糙度和简单剪切力两个方面表征了表面粗糙度，并显示出忠实地再现了实验值。

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