Abstract
The plastic anisotropy of rolled Al sheets is the result of a crystallographic texture. It leads to the formation of uneven cup heights during deep-drawing, which is called earing. A new, simple and rapid method had been previously developed by the authors to predict earing directly from {h00} pole figures. In the present manuscript, this method is applied to cross-rolling for the first time. 5056 type aluminum sheets were unidirectionally- (conventionally) and cross-rolled from 4 to ~1 mm thickness in 6 or 12 passes. Earing was predicted from recalculated {200} pole figures obtained after X-ray diffraction texture measurements. The results were validated by deep-drawing tests. It is shown that the proposed method predicts the type (locations of ears) and magnitude of earing with satisfactory results. However, a different scaling factor must be used to calculate the magnitude of earing for cross-rolling than for unidirectional rolling even if all other parameters (including cold rolling, texture measurements, and deep-drawing) are the same. This is because the cross-rolled sheets exhibit a similar type but weaker earing compared to the unidirectionally rolled samples.
Highlights
The term cross-rolling is used for different special types of rolling processes [1]
Wronski et al used cross-rolling on low carbon ferritic steel and copper and found that plastic anisotropy was decreased in copper; it increased in the low carbon steel [3]
It can be seen that the both rolling types resulted in elongated grains and notable differences cannot be observed
Summary
The term cross-rolling is used for different special types of rolling processes [1]. Here, cross-rolling means a modified version of conventional or unidirectional sheet rolling, where the sheet—and the rolling direction (RD)—is rotated by 90◦ about its normal direction (ND) between subsequent passes [2,3,4,5]. Applied cross-rolling on magnesium sheets and concluded that large basal plane scatter was achieved, which resulted in a more random texture [2]. Wronski et al used cross-rolling on low carbon ferritic steel and copper and found that plastic anisotropy was decreased in copper; it increased in the low carbon steel [3]. Huh et al applied cross-rolling to suppress cube texture formation in 5182 aluminum after annealing and observed a close to random structure and better formability [4]. Tang et al obtained similar results on cross-rolled AZ31 aluminum, and besides negligible earing, they found that increased ductility was achieved by cross-rolling [5]. It can be safely stated that, in general, a more random texture and decreased plastic anisotropy is expected in aluminum alloys after cross-rolling
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