Asymmetric (Hot, Warm, Cold, Cryo) Rolling of Light Alloys: A Review

Abstract

Asymmetric sheet rolling is a process used when there are differences in any technological parameters in the horizontal plane across the width of the deformation zone or in the vertical plane between the top and bottom surfaces of the deformation zone. Asymmetry can either have random causes, or it can be created purposefully to reduce rolling force, improve sheet flatness, minimize the ski effect, obtain thinner sheets and for grain refinement and improvement of texture and mechanical properties of sheet metals and alloys. The purpose of this review is to analyze and summarize the most relevant information regarding the asymmetric (hot, warm, cold, cryo) rolling processes in terms of the effect of purposefully created asymmetry on grain size and mechanical properties of pure Mg, Al, Ti and their alloys. The classification and fundamentals of mechanics of the asymmetric rolling process are presented. Based on the analysis of publications related to asymmetric rolling, it was found that a superior balance of strength and ductility in pure Mg, Al, Ti and their alloys could be achieved due to this processing. It is shown that asymmetric rolling in comparison with conventional severe plastic deformation methods have an undeniable advantage in terms of the possibility of the production of large-scale sheets.

Study on Symmetry and Asymmetry Rolling of AA2519-T62 Alloy at Room-Temperature and Cryogenic Conditions

“…In the literature on the processes of asymmetric rolling of aluminum alloys, authors used various asymmetry coefficients up to 2.5 [ 35 , 36 , 37 , 38 ], but there are also examples of very large asymmetry coefficients of 4.0 [ 39 ]. In the work on the basis of the literature data as well as the earlier studies of the authors concerning the asymmetric rolling processes [ 33 , 34 ], the asymmetry coefficients ranging from 1.2 to 1.6 were used, which should reveal the influence of the asymmetry on the properties of the rolled material.…”

Investigation of materials flow during the manufacturing process by experimental evidence and numerical approaches

“…The models can be extended by crystallographic and texture calculations for determining the anisotropic and general mechanical properties of the deformed material. Examples for applying the FEM to modeling the rolling process can be found in literature [1, 3,5,49,50,52,53,[62][63][64][65][66][67][68].…”

Grain Refinement and Phase Transformation of Pure Titanium Foils During Asymmetrical Rolling

“…In the meantime, the materials prepared through the ASR process can be used to refine grains and weaken the texture, thus improving the formability of the materials. [ 3–5 ] As indicated by M. Wronski, [ 6,7 ] the grain size of aluminum alloys and pure titanium is smaller and they are more evidently broken during the ASR process than in the SR process. As revealed by Zhiming Li, [ 8 ] the microstructure of pure titanium sheet after the ASR process and annealing is comprised of ultrafine grains, showing high stability.…”