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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: 2006-02-08
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 structural schematic diagram of the test device adopted in the present invention. Concrete steps of the present invention are as follows:

[0019] 1) Install cylindrical upper and lower anvils 1 and 2 on the upper and lower pressing heads 3 and 4 of the press respectively, and a thrust bearing is also installed between the lower anvil 2 and the lower pressing head 4, through which the lower The anvil head 2 can rotate axially, and the ends of the upper and lower anvil heads 1 and 2 are textured;

[0020] 2) The upper and lower anvils 1 and 2 are fitted with side rings 5. The side rings 5 ​​are double-layered structures inside and outside. The inner layer is made of ASSAB88 tool steel, which has high hardness and toughness. The outer layer is made of medium carbon. Steel has high toughness, and the side ring 5 fits with the upper and lower anvil heads 1 and 2 with zero clearance;

[0021] 3) The sample 6 to be processed is placed in the side ring 5, ...

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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 preparation method of a nanostructure metal material, in particular to a high pressure torsion [High Pressure Torsion (HPT)] clamping test method used on a material testing machine. Background technique [0002] Using severe plastic deformation SPD technology (Progress in Materials, 2000, 45(2): 103-189) can refine the grain size of metal materials to submicron or even nanometer level. Compared with other nanostructure material preparation techniques, it can obtain non-pollution, 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 torsional deformation under high pressure for the first time to conduct experiments. The devices used are such as figure 1 As shown, the anvil head and the anvil block are integrated to form upper and lowe...

Claims

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Application Information

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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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