An Efficient Superplastic Deformation Method Based on Minimum m Value
A superplastic deformation, m value technology, applied in the direction of using stable tension/pressure to test the strength of materials, etc., can solve the problems of low efficiency and long forming time
Inactive Publication Date: 2016-03-02
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology
Although the previous maximum m-value superplastic deformation method can obtain a large amount of superplastic deformation of metal materials, it requires a long forming time and relatively low efficiency, and for practical production applications, the superplastic deformation of the workpiece The amount of deformation is often as long as it meets the needs of forming
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[0010] Below in conjunction with accompanying drawing and example the present invention is described in detail:
[0011] In the superplastic deformation high-temperature tensile test, the present invention adopts the minimum m value efficient superplastic deformation to replace the conventional superplastic deformation, and according to the minimum m value high-efficiency superplastic deformation requirement, the m value meets the plastic forming requirements of metal material workpieces Under the premise, the value of m should be kept as small as possible, and the strain rate should be in the superplastic high-speed region, that is, the deformation process can be completed at a high rate at the minimum value of m corresponding to the plasticity requirements. as follows figure 1 shown. Due to the unimodality of the m value and logarithmic strain rate curve, if the m value is not the maximum value, the corresponding strain rate has two points, that is, the high speed point and...
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The invention discloses an efficient superplastic deformation method based on a minimum m value. The m value is enabled to be minimum as much as possible on the premise of ensuring the plasticity required by formation in a high-speed region of superplasticity, the m value corresponding to the required plasticity is named as the minimum m value, the efficient superplastic deformation is carried out near a high strain rate corresponding to the minimum m value, the advantages of minimum m value, high strain rate and high forming efficiency and the defect of poorer superplasticity are provided, and therefore, the minimum m value is required to be obtained on the basis of ensuring the plasticity requirement in engineering application. The efficient superplastic deformation method based on the minimum m value is innovatively adopted for carrying out superplastic deformation on a metal material, so that the requirement of actual production application on efficient superplastic deformation is met. The method lays the firm theoretical and experimental foundation for the wide application of superplastic deformation to the metal material.
Description
technical field [0001] The present invention relates to the field of research and application of superplasticity of metal materials, in particular to an efficient superplastic deformation method using the minimum m value, that is, performing superplastic tensile tests on material electronic tensile testing machines or superplastic forming hydraulic presses. method of molding. Background technique [0002] In the superplastic deformation of metal materials, the sensitivity index m value of the flow stress to the strain rate is an important characteristic of the superplasticity of the material, which reflects the ability of the material to resist the development of shrinkage during the tensile deformation process, and its value is equal to stress( )-strain rate ( ) the slope of the logarithmic curve. Although the previous maximum m-value superplastic deformation method can obtain a large amount of superplastic deformation of metal materials, it requires a long forming tim...
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IPC IPC(8): G01N3/08
Inventor 王高潮郑漫庆马超
Owner NANCHANG HANGKONG UNIVERSITY