Method for reinforcing metal through roll bending and combined deformation

Abstract

The invention relates to a method for reinforcing metal through roll bending and combined deformation. After a metal material is rolled to a certain size by using a rolling mill, the metal material is introduced to a bending roll system capable of realizing repeated plastic bending deformation through a pair of pinch rolls so as to be subjected to repeated plastic bending deformation. A metal structure of which accumulative strains from a neutral layer to a surface layer are progressively increased and grain structures are refined and progressively increased is formed inside the metal material through the repeated plastic bending deformation of the metal material in the bending roll system, so that a deformation method for increasing the strain capacity inside the metal and improving the toughness of the metal material and particularly the surface toughness of the metal material under the condition that the size of the metal material is basically invariable, namely the method for reinforcing metal through roll bending and combined deformation, is achieved

Description

technical field [0001] The invention relates to a method for strengthening metal materials, in particular to a method for strengthening metal through rolling and bending combined deformation. Background technique [0002] In recent years, with the rapid development of the global economy, people's awareness of the consumption of resources and the protection of the green environment is increasing day by day. While the demand for metals that humans rely on for survival is increasing, it is hoped that high-strength metal materials will be developed to replace conventional metal materials in order to save metal resources. There are two methods to improve the strength of metal materials, one is alloying, which is a resource-consuming strengthening mechanism; the other is microstructure (grain) refinement, which is a resource-saving strengthening mechanism, according to the Hal1-Petch relationship σ s = σ 0 +k·d -1 / 2 (d is the size of the crystal grain), refining the grain can ...

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Problems solved by technology

[0003] The present invention is to provide a method for strengthening metal through rolling and bending combined deformation. A device for repeated plastic bending of metal materials is added to the rolled products to realize the repeated plastic bending deformation of metal materials in a set of bending roll systems. Internally, the cumulative strain from the neutral layer to the surface layer is gradually increased, and the grain structure is gradually refined, so as to increase the internal strain of the metal and improve the strength and toughness of the metal material under the condition that the size of the metal material is basically unchanged. Especially a deformation method for the surface strength and toughness of metal materials, that is, combined deformation of rolling and bending to strengthen metal materials

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