ASYMMETRIC ROLLING OF SHEETS AND STRIPS: HISTORY AND DEVELOPMENT PROSPECTS
DOI:
https://doi.org/10.14529/met200309Keywords:
schools of thought, asymmetrical rolling, severe plastic deformation, nanostructure, rolling millAbstract
A brief historical analysis of asymmetric rolling by well-known Russian scholarly traditions was carried out in this article. The article notes that there has been renewed interest in asymmetric rolling since the 2010s. These processes were considered from a different angle in terms of obtaining the required metal structure. It is shown that one of the most advanced high-performance methods of severe plastic deformation for the metal materials ultrafine-grained structure production of is the process of asymmetric fine-sheet rolling, based on purposefully created asymmetry due to the mismatch of the rolls peripheral speeds. The theoretical foundations of the metals and alloys asymmetric fine-sheet rolling as a method of severe plastic deformation are presented. A comparison of the shear deformation during equal-channel angular pressing for symmetric and asymmetric rolling is made. It is shown that in asymmetric fine-sheet rolling process with a reduction of 60% at optimal process parameters, the shear angle exceeds 80°, and the true strain in one pass is ≈ 3.8…4.8 in sheet thickness. The regularities of the ultra-high shear deformations creation in the processed materials are established based on computer modeling by the finite element method. It is include bimetallic layered composites, during rolling with a mismatch of the rolls peripheral speeds, as well as during asymmetric cryogenic rolling. The analysis of the rolling bimetallic-layered composites possibility in work rolls with a special surface microrelief is carried out. The characteristics of a unique experimental laboratory duo mill with an individual drive of the work rolls for the asymmetric and accumulating rolling processes implementation in the SPD mode, designed and manufactured in South Korea, are given. The mill will be installed in the laboratory of gradient nanomaterials mechanics of the Nosov Magnitogorsk State Technical University.References
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