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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Forming limit diagrams of fine-grained Al 5083 produced by equal channel angular rolling process
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Forming limit diagrams of fine-grained Al 5083 produced by equal channel angular rolling process

机译：等径角轧制法制得的细晶粒Al 5083的成形极限图

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摘要

The objective of this research is to study the strain forming limits of Al–Mg alloy (5083) sheet, fabricated by equal channel angular rolling process at room temperature. For this purpose, the equal channel angular rolling process was executed at room temperature in three passes. Mechanical properties, microhardness, and microstructure were investigated after the equal channel angular rolling process. Uniaxial tensile tests of the equal channel angular rolling process produced samples and showed that yield and ultimate stresses increase, while the uniform elongation to fracture decreases in comparison with the annealed state. There was a continuous hardness enhancement by increasing the number of the equal channel angular rolling passes. After the third pass, the amount of hardness raised by 73% in comparison with the annealed sample. In the fourth pass, the hardness reduced slightly, that was attributed to the strain saturation in room temperature and was followed by high surface cracks. In the annealed condition, the average grain size was 45 µm, and after the third equal channel angular rolling pass, this amount was reduced to 10 µm. Furthermore, the forming limit diagrams were determined experimentally, using the Nakazima test. The obtained results show that after the third pass, the forming limit diagrams’ level move downward, meaning that a reduction occurred in the forming limits of equal channel angular rolled samples.
机译：这项研究的目的是研究在室温下通过等通道转角轧制工艺制成的Al-Mg合金（5083）板的应变形成极限。为此，在室温下分三道次进行等通道角轧制。等通道角钢轧制后，研究了机械性能，显微硬度和显微组织。与退火状态相比，等径角钢轧制过程的单轴拉伸试验产生了样品，结果表明屈服强度和极限应力增加，而均匀的断裂伸长率降低。通过增加等通道角向轧制道次的次数，硬度不断提高。在第三次通过之后，与退火样品相比，硬度增加了73％。在第四道次中，硬度略有降低，这归因于室温下的应变饱和，随后出现高表面裂纹。在退火状态下，平均晶粒尺寸为45μm，并且在第三次等通道角轧制道次之后，该量减小到10μm。此外，使用中岛试验通过实验确定了成形极限图。获得的结果表明，在第三遍之后，成形极限图的水平向下移动，这意味着等通道角钢轧制样品的成形极限减小了。

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