期刊
MATERIALS CHARACTERIZATION
卷 148, 期 -, 页码 214-223出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.12.017
关键词
Asymmetric rolling; Microstructure; Texture; EBSD; X-ray diffraction; Mechanical properties
类别
资金
- Polish National Science Centre (NCN) [UMO-2017/25/B/ST8/00134]
- AGH University of Science and Technology within Ministry of Science and Higher Education [11.11.220.01/5]
The paper presents mechanical characteristics of the symmetric and asymmetric rolling processes as well as microstructure and material modifications of asymmetrically rolled polycrystalline copper. Mechanical aspects of the rolling process were examined experimentally and studied using the Finite Element Method. It was confirmed that the rolling normal force is reduced and distribution of torques between two work rolls are strongly modified in asymmetric rolling process, as compared with the symmetric one. The microstructure characteristics of asymmetrically rolled polycrystalline copper were examined using the EBSD technique, optical metallography and X-ray diffraction. It was found that asymmetric rolling leads to a grain refinement, an important modification of selected microstructure parameters, a slight modification of mechanical characteristics, a texture rotation around transverse direction and a homogenization of the shear strain and texture. It has to be underlined that an important contribution of the present work consists in a detailed study of the mechanical characteristics, related with material microstructure examination, for asymmetric and symmetric rolling processes. Experimental determination of the rolling normal force and distribution of torques between two work rolls is accompanied by theoretical predictions. Another interesting result is that microstructure modifications depend not only on the asymmetry ratio, but also on the way of inducing rolling asymmetry (modification of rolling gap geometry in the present case case).
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