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High pressure torsion test method capable of fining sample grain

A technology of high-pressure torsion and experimental methods, applied in the preparation of test samples, etc., can solve difficult problems, achieve the effect of reducing requirements and improving bearing capacity

Inactive Publication Date: 2008-06-04
INST OF MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to quantitatively study the influence of process parameters (deformation, pressure) on grain refinement in the HPT process.

Method used

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  • High pressure torsion test method capable of fining sample grain
  • High pressure torsion test method capable of fining sample grain
  • High pressure torsion test method capable of fining sample grain

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Experimental program
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Embodiment Construction

[0018] figure 2 It is a schematic diagram of the structure of the test device used in the present invention. The specific steps of the present invention are as follows:

[0019] 1) Cylindrical upper and lower anvils 1 and 2 are installed on the upper and lower indenters 3 and 4 of the press. A thrust bearing is also installed between the lower anvil 2 and the lower indenter 4. The anvil 2 can be rotated axially, and the ends of the upper and lower anvils 1 and 2 are textured;

[0020] 2) Side rings 5 ​​are fitted on the upper and lower anvil heads 1 and 2. The side ring 5 has an inner and outer double layer structure. The inner layer is selected as ASSAB88 tool steel, which has higher hardness and toughness, and the outer layer is medium carbon. Steel, with high toughness, zero clearance fit between the side ring 5 and the upper and lower anvils 1, 2;

[0021] 3) The sample 6 to be processed is placed in the side ring 5, between the upper and lower anvils 1, 2. The diameter of t...

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Abstract

The invention discloses a high pressure deflection experimental method which can lead the sample grain refined. It comprises the following steps: 1) fixing cylinder-type up-and-down peg bars on the up-and-down rams of the presser, wherein one of the up-and-down peg bars can rotate and the end part of the rams is after fur handle; 2) cover-fixing a flank ring on the up-and-down peg bars with zero gap matching; 3) depositing the sample inside the flank ring and between the up-and-down peg bars, wherein the sample and the flank ring have the same internal diameter; 4) pressing 1-9GPa vertical pressure to the sample by presser and then keeping it and rotating the ram 0.1-10 loops.

Description

Technical field [0001] The invention relates to a method for preparing a nano-structured metal material, in particular to a high pressure torsion (HPT) clamping experiment method used on a material testing machine. Background technique [0002] Using the severe plastic deformation SPD technology (Progress in Materials, 2000, 45(2): 103-189), the grain size of metal materials can be refined to the submicron or even nanometer level. Compared with other nanostructured material preparation technologies, it can obtain non-polluting, fully dense bulk samples, which is of great significance for the study of the intrinsic properties of nanocrystalline materials and future industrial applications. [0003] Zhorin et al. (1984) and Kuznetsov et al. (1985) used the method of severe torsion deformation under high pressure for the first time to conduct experiments. figure 1 As shown, the anvil and the anvil are integrated to form the upper and lower anvils with dimples. The diameter of the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 上官丰收洪友士谢季佳周承恩武晓雷
Owner INST OF MECHANICS CHINESE ACAD OF SCI
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