Method for reinforcing metal through roll bending and combined deformation

A deformation strengthening and metal technology, which is applied in the field of rolling and bending combined deformation strengthening metal to achieve the effect of simple realization process, optimized size and strengthening of metal materials

Inactive Publication Date: 2015-12-09
SHANGHAI INST OF TECH
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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 incre

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  • Method for reinforcing metal through roll bending and combined deformation
  • Method for reinforcing metal through roll bending and combined deformation
  • Method for reinforcing metal through roll bending and combined deformation

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specific Embodiment

[0054] 1. Experimental analysis of the metallographic structure of the metal plate after bending deformation

[0055] In order to further analyze the effect of the internal cumulative strain on the metal structure of the H85 brass plate after repeated plastic bending deformation. Sampling at different positions along the thickness direction of the sample (such as Figure 4 Shown, is the sampling position) for metallographic observation and analysis.

[0056] The metallographic samples taken are: fully annealed sample before bending deformation, 3 cycles of bending deformation with diameter-thickness ratio r / h=1.5, 5 cycles of bending deformation with diameter-thickness ratio r / h=4 Sample, the metallographic microstructure of the sample is as follows Figure 5 shown. From Figure 5 (a) It can be seen that the grains of the annealed material are mostly equiaxed, and the average grain size is about 60 μm. Figure 5 (b) is r / h=1.5, after 3 cycles of bending deformation, the m...

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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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Application Information

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IPC IPC(8): C21D7/02
Inventor 魏立群肖壮卢冬华
Owner SHANGHAI INST OF TECH
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