Efficient superplastic deformation method based on minimum m value
A technology of superplastic deformation and m value, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of long forming time and low efficiency, and achieve the effect of meeting the needs of efficient superplastic deformation
Inactive Publication Date: 2013-05-22
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 embodiment the present invention is described in detail;
[0011] In the high-temperature tensile test of the high-efficiency method superplastic deformation based on the minimum m value, the present invention adopts the minimum m-value high-efficiency method superplastic deformation to replace the conventional superplastic deformation, and according to the requirements of the minimum m-value high-efficiency method, the m value meets the requirements of the metal Under the premise of the plastic forming requirements of the material workpiece, the value of m should be 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 under the minimum value of m corresponding to the plasticity requirements. as follows figure 1 As shown, due to the unimodality of the m value and the logarithmic strain rate curve, there are two points ...
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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 invention relates to the field of research and application of superplasticity of metal materials, in particular to a method for performing a superplastic tensile test on a material electronic tensile testing machine by using a minimum m value high-efficiency method. 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 time and relatively low efficiency, and for practical production applications, the s...
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IPC IPC(8): G01N3/08
Inventor 王高潮郑漫庆马超
Owner NANCHANG HANGKONG UNIVERSITY