Abstract
Asymmetric rolling is an attractive metal forming process due to its simplicity, low cost and capability to produce unique characteristics in materials. The asymmetry promoted by the process leads to a formation of a large collection of texture components and a refined structure which is capable to improve the mechanical behavior of metallic materials. The aim of this work is to present a perspective of the process and to construct the bases for future development and application of this technique. Thus, several aspects are addressed such as process methods (i.e., dissimilarity of the rolls diameters, rolls angular speed or friction conditions), the process parameters (i.e., total thickness reduction, thickness reduction per pass, peripheral speed ratio, rolling routes) and their effect on material properties, including texture and microstructure evolution, and mechanical properties. This review is focused on the experimental description of asymmetric rolling applied to aluminum alloys and steels. Although the asymmetric rolling application was mostly at a laboratory scale, there is a good perspective for its implementation in the industry. The pros and cons based on the up to date literature and authors’ experience are presented and discussed.
Highlights
Nowadays, the demanding request for lighter and safer structures, the low cost, recyclability, and green manufacturing is a priority
Asymmetric rolling is a process that can lead to grain refinement and/or shear texture components which are associated with an increase in strength and formability
They evaluated the effect of asymmetry imposed by the variation of rolls speed ratio in aluminum alloys in only one pass of rolling with a reduction of 36%, and concluded that a minimal existence of asymmetry as low as
Summary
The demanding request for lighter and safer structures, the low cost, recyclability, and green manufacturing is a priority. The first study in asymmetric rolling has been performed in 1948 by Sachs and Klinger [1] for the development of a homogeneous deformation model. Based on this first approach, some researchers used this concept to study the evolution of rolling process parameters, such as rolling torque, force separation or sheet curvature [2,3,4,5,6,7]. Others studied the metal flow behavior during asymmetric rolling [8,9] and the relation between geometrical parameters and the initial blank and the kinetics of material [10,11,12,13]
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