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High strain rate deformation of ARMOX 500T and effects on texture development using neutron diffraction techniques and SHPB testing
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2017-09-17 , DOI: 10.1016/j.msea.2017.09.022
Michael Saleh , Muhammad M. Kariem , Vladimir Luzin , Karl Toppler , Huijun Li , Dong Ruan

The authors evaluated the crystallographic texture, defined as the distribution of orientation of crystals (or grains), to gauge the deformation and microstructural evolution of ARMOX 500T armour plates at elevated strain rates. Using neutron diffraction, the authors examined a number of specimens deformed at room temperature and high strain rates and contrasted these with equivalent samples deformed quasi-statically. Since crystallographic texture can play a part in the armour's ballistic response the authors were able to observe a rate dependent textural development, with the strengthening of the rolling α-fibre. The hot rolling process used in the manufacture of these steels leads to a through thickness texture variation that leads to an asymmetric transitional texture in the strain regime (1–2%) but with increased strain a symmetric texture develops irrespective of the strain rate, albeit with different intensities. By extending the testing program the authors were also able to deduce the strength parameters for the Johnson-Cook model through split Hopkinson pressure bar testing at high strain rates (1000–3000 s−1) and elevated temperatures (20–600 °C). The results, when compared with existing literature, show deviations in the strain rate sensitives of the tested specimens and, subsequently, variations in the computed flow stress parameters.



中文翻译:

使用中子衍射技术和SHPB测试,ARMOX 500T的高应变率变形及其对织构发展的影响

作者评估了晶体学织构,定义为晶体(或晶粒)取向的分布,以评估在较高应变速率下ARMOX 500T装甲板的变形和微结构演变。使用中子衍射,作者检查了许多在室温和高应变率下变形的标本,并将它们与准静态变形的等效标本进行对比。由于晶体织构可以在装甲的弹道反应中发挥作用,因此作者能够观察到速率相关的织构发展以及滚动α纤维的增强。在这些钢的制造中使用的热轧工艺会导致厚度变化,从而导致应变状态下的不对称过渡织构(1-2%),但是随着应变的增加,尽管应变率高,对称织构也会发展,尽管具有不同的强度。通过扩展测试程序,作者还能够通过在高应变率(1000–3000 s)下进行的霍普金森压力棒分裂测试来推断约翰逊库克模型的强度参数。-1)和高温(20–600°C)。与现有文献相比,结果显示了被测样品的应变率敏感度出现偏差,随后,计算出的流动应力参数发生了变化。

更新日期:2017-09-17
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