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Reverse gradient-structured metallic sheet using complex shear deformation and subsequent annealing fabricating method thereof and apparatus for carrying out continuous shear deformation process thereof
Reverse gradient-structured metallic sheet using complex shear deformation and subsequent annealing fabricating method thereof and apparatus for carrying out continuous shear deformation process thereof
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机译：使用复剪切变形和随后的退火制造方法及其用于执行其连续剪切变形过程的装置反向梯度结构的金属片
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摘要
The present invention provides a reverse gradient structure that simultaneously improves the strength and ductility of an existing metal plate by sequentially applying complex shear deformation to a metal plate and then performing subsequent heat treatment to ensure high productivity and express a unique microstructure called a reverse gradient structure. It relates to a metal plate, a method for manufacturing the same, and a continuous shear strain field of the metal plate. The present invention uses a continuous shear deformation device using a single roll to ensure high productivity and at the same time induce complex shear deformation on a metal sheet. Through this, the metal plate undergoes complex shear deformation in the order of circumferential shear deformation, channel angular shear deformation, and surface shear deformation, and a relatively high amount of shear deformation is accumulated in the center compared to the surface portion of the metal plate, and during subsequent heat treatment, the The recrystallization and grain growth behavior is heterogeneous, and a reverse gradient structure with fine grains at the center and coarse grains at the surface is expressed. In addition, as the thickness of the metal sheet is restored to its initial state after the composite shear deformation, it is possible to manufacture a customized reverse gradient structure metal sheet according to the target characteristics of the person being evaluated through adjustment of process variables such as the number of repeated processes, the process route, the subsequent heat treatment time and temperature. possible.
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