CN100392373C - High pressure torsion test method capable of fining sample grain - Google Patents
High pressure torsion test method capable of fining sample grain Download PDFInfo
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- CN100392373C CN100392373C CNB200510089151XA CN200510089151A CN100392373C CN 100392373 C CN100392373 C CN 100392373C CN B200510089151X A CNB200510089151X A CN B200510089151XA CN 200510089151 A CN200510089151 A CN 200510089151A CN 100392373 C CN100392373 C CN 100392373C
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- anvil head
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- anvil
- high pressure
- side ring
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Abstract
The present invention discloses a high pressure torsion test method for grain refinement of samples, which comprises the following steps that an upper press head and a lower press head of a pressing machine are respectively provided with an upper cylindrical anvil head and a lower cylindrical anvil head, one of which can axially rotate, and the ends of the upper anvil head and the lower anvil head are roughly processed; the upper anvil head and the lower anvil head are sheathed with side rings which form zero clearance fit with the upper anvil head and the lower anvil head; samples to be tested are arranged in the side rings and between the upper anvil head and the lower anvil head, and the diameters of the samples to be tested are the same as the internal diameter of the side rings; the pressing machine exerts the vertical pressure of 1 to 9 GPa to the samples to be tested, and then keeps unchanged, and the rotatable anvil head is rotated for 0.1 circle to 10 circles. The fit of the side rings and the anvil heads of the present invention is the zero clearance fit, the diameters of the anvil heads are thickened when the anvil heads bear pressure P, the fit of the side rings and the anvil heads becomes an interference fit, so that the sample materials are difficult to be extruded from the contact surfaces of the anvil heads and the side rings in the process of deformation, and the thickness of the samples is not changed.
Description
Technical field
The present invention relates to a kind of preparation method of nano structure metal materials, particularly a kind of high pressure torsion that on Material Testing Machine, uses (High Pressure Torsion (HPT)) clamping experimental technique.
Background technology
Utilize violent plastic yield SPD technology (Progress in Materials, 2000,45 (2): 103～189) crystallite dimension of metal material can be refine to sub-micron even nanometer scale.Compare with other nano structural material technology of preparing, it can obtain pollution-free, fully dense block sample, and this research and commercial Application in the future for the nanocrystalline material intrinsic performance has significant meaning.
(1985) such as Zhorin etc. (1984) and Kuznetsov have adopted first that the method for violent torsional deflection experimentizes under the high pressure, used device as shown in Figure 1, anvil head and anvil block are made of one, and form the upper and lower incus with pit.The diameter of sample is suitable with the internal diameter of upper and lower incus, and the thickness of sample forms the height of cavity greater than upper and lower incus.In whole load deflection process, sample material will be full of the cavity that is formed jointly by upper and lower incus fully like this, and have the part sample material to extrude between the surface of contact of incus.Sample thickness will diminish like this, and (generally can drop to original half (Progress in Materials, 2000,45 (2): 103～189)), the deformation process of sample is the composite deformation that compresses and reverse, and is not easy to the quantitative test of being out of shape like this.Hydrostatic force P realizes by applying a constant load between the upper and lower incus.In loading, deformation process, changed the area of bearing load from the sample material of extruding between the incus.Owing to the variation of receiving area, the big young pathbreaker of hydrostatic force P changes like this.Therefore be difficult to use of the influence of the technological parameter (deflection, pressure) of quantitative research HPT process to grain refinement.
Summary of the invention
Problem at above-mentioned existence, the object of the present invention is to provide a kind of high pressure torsion experimental technique of test sample grain refining, it is uncontrollable to overcome in the prior art hydrostatic force P of process, and the difficulty that is difficult to quantitative test at the deflection of processing procedure.
For achieving the above object, the high pressure torsion experimental technique of a kind of test sample grain refining of the present invention comprises the steps:
1) cylindric upper and lower anvil head is installed respectively on the upper and lower pressure head of pressing machine, but one of described upper and lower anvil head axial rotation, and handle through texturing the end of upper and lower anvil head;
2) on upper and lower anvil head, be set with side ring, cooperate for the zero stand-off between side ring and the upper and lower anvil head;
3) pending sample is placed in the side ring, and between the upper and lower anvil head, the diameter of sample to be tested is identical with the internal diameter of side ring;
4) pressing machine applies the pressure at right angle of 1～9GPa to sample to be tested, remains unchanged then, and rotates rotatable anvil head 0.1～10 circle.
Further, described side ring is interior outer double-layer structure, and internal layer is selected hardness and all higher material of toughness, as tool steel; The outer higher material of toughness of selecting is as medium carbon steel or tool steel.
Further, the model of described tool steel is ASSAB88.
Further, described upward anvil head or following anvil head are installed on described seaming chuck or the push-down head by thrust bearing is rotatable.
The invention has the beneficial effects as follows: the matching design between side ring and the anvil head becomes the zero stand-off to cooperate, the diameter chap of anvil head when bearing pressure P, cooperation between them will become interference fit, sample material is difficult to extrude between the surface of contact of anvil head and side ring in deformation process like this, the thickness that has guaranteed sample can not change, therefore it is uncontrollable enough to overcome in the prior art hydrostatic force P of process, and the difficulty that is difficult to quantitative test at the deflection of processing procedure; In addition, the mould side ring is designed to double-deck ring structure, effectively improves the load-bearing capacity of side ring, has reduced the requirement of offside ring material intensity.
Description of drawings
Fig. 1 is the structural representation of the test unit that prior art adopted.
Fig. 2 is the structural representation of test unit of the present invention.
The EBSD figure that Fig. 3 a, b are forward and backward for HPT of the present invention handles.
Fig. 4 is degree of grain refinement (d/d
0) along sample radial distribution curve map.
Embodiment:
Fig. 2 is the structural representation of test unit of the present invention.Concrete steps of the present invention are as follows:
1) cylindric upper and lower anvil head 1,2 is installed respectively on the upper and lower pressure head 3,4 of pressing machine, between following anvil head 2 and the push-down head 4 thrust bearing is installed also, but by anvil head 2 axial rotation under this thrust bearing, handle through texturing the end of upper and lower anvil head 1,2;
2) be set with side ring 5 on upper and lower anvil head 1,2, side ring 5 is interior outer double-layer structure, and it is the tool steel of ASSAB88 that internal layer is selected model, its hardness and toughness are all higher, the outer medium carbon steel of selecting, its toughness is higher, cooperates for the zero stand-off between side ring 5 and the upper and lower anvil head 1,2;
3) pending sample 6 is placed in the side ring 5, and between the upper and lower anvil head 1,2, the diameter of sample to be tested 6 is identical with the internal diameter of side ring 5;
4) pressing machine applies the pressure at right angle of 1.2GPa to sample to be tested 6, remains unchanged then, and rotates anvil head 2 0.25,0.5,8,10 circles by thrust bearing.
Wherein, pending sample 6 materials be fine copper T2 (〉=99.90%wt), be machined to physical dimension Φ 8.00mm * 0.86mm, again through 650 ℃ of vacuum annealing 100min, obtain former primary state sample.As shown in the table, different number of turns HPT handle grain size distribution on the pure copper samples 6 of back:
After the HPT processing, the crystallite dimension of pure copper samples refine to 0.27 μ m from 13.24 original μ m, and the crystallite dimension refinement is two magnitudes nearly.
Fig. 4 is degree of grain refinement (d/d
0) along sample radial distribution curve map.
In addition, generally be that diameter is 8～20mm for the size of sample, thickness is 1-2mm.
Claims (4)
1. the high pressure torsion experimental technique of a test sample grain refining is characterized in that, comprises the steps:
1) cylindric upper and lower anvil head is installed respectively on the upper and lower pressure head of pressing machine, but one of described upper and lower anvil head axial rotation, and handle through texturing the end of upper and lower anvil head;
2) on upper and lower anvil head, be set with side ring, cooperate for the zero stand-off between side ring and the upper and lower anvil head;
3) pending sample is placed in the side ring, and between the upper and lower anvil head, the diameter of sample to be tested is identical with the internal diameter of side ring;
4) pressing machine applies the pressure at right angle of 1～9GPa to sample to be tested, remains unchanged then, and rotates rotatable anvil head 0.1～10 circle.
2. the high pressure torsion experimental technique of a kind of test sample grain refining according to claim 1 is characterized in that, described side ring is interior outer double-layer structure, and internal layer is selected the tool steel of high rigidity and high tenacity, the outer medium carbon steel of selecting high tenacity.
3. the high pressure torsion experimental technique of a kind of test sample grain refining according to claim 2 is characterized in that, the model of described tool steel is ASSAB88.
4. according to the high pressure torsion experimental technique of the arbitrary described a kind of test sample grain refining of claim 1 to 3, it is characterized in that described upward anvil head or following anvil head are installed on described seaming chuck or the push-down head by thrust bearing is rotatable.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200510089151XA CN100392373C (en) | 2005-08-04 | 2005-08-04 | High pressure torsion test method capable of fining sample grain |
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| CNB200510089151XA CN100392373C (en) | 2005-08-04 | 2005-08-04 | High pressure torsion test method capable of fining sample grain |
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| CN1731131A CN1731131A (en) | 2006-02-08 |
| CN100392373C true CN100392373C (en) | 2008-06-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399808A (en) * | 2014-09-05 | 2015-03-11 | 合肥工业大学 | Device for realizing high-pressure twisting process on hydraulic press |
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| CN103223454B (en) * | 2013-04-23 | 2015-03-25 | 太原科技大学 | Upsetting and torsion combined deformation device |
| CN103480789B (en) * | 2013-10-18 | 2015-11-18 | 核工业理化工程研究院 | Aluminium alloy dish workpiece pressure turns round forming method |
| CN105107914A (en) * | 2015-08-17 | 2015-12-02 | 盐城工学院 | High-pressure torsion forming machine |
| CN105296903B (en) * | 2015-10-29 | 2017-05-31 | 燕山大学 | A kind of ZrTiAlV alloys high pressure turn-knob electric field-assisted is heat-treated fine grain method |
| JP6892868B2 (en) * | 2016-02-19 | 2021-06-23 | イートン インテリジェント パワー リミテッドＥａｔｏｎ Ｉｎｔｅｌｌｉｇｅｎｔ Ｐｏｗｅｒ Ｌｉｍｉｔｅｄ | Engine valve lifter with anti-rotation plug |
| CN106011417B (en) * | 2016-07-29 | 2018-04-13 | 北方工业大学 | Method for preparing rodlike metal gradient nano structure |
| CN108526282B (en) * | 2017-03-03 | 2020-07-14 | 南京码尔够传动科技有限公司 | Multifunctional high-pressure torsion nano material forming machine |
| CN106925648B (en) * | 2017-04-18 | 2018-09-04 | 燕山大学 | A kind of electric field-assisted high pressure torsion device and high pressure torsion method |
| US10907226B2 (en) * | 2018-12-20 | 2021-02-02 | The Boeing Company | Methods of modifying material properties of workpieces using high-pressure-torsion apparatuses |
| CN112958683B (en) * | 2021-02-19 | 2023-06-27 | 合肥工业大学 | Composite material forming device and forming method |
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| US3811308A (en) * | 1966-02-14 | 1974-05-21 | Rotary Profile Anstalt | Profiling of workpieces |
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| US20050081594A1 (en) * | 2003-10-20 | 2005-04-21 | Segal Vladimir M. | Twist-extrusion process |
| US6895795B1 (en) * | 2002-06-26 | 2005-05-24 | General Dynamics Ots (Garland), L.P. | Continuous severe plastic deformation process for metallic materials |
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Patent Citations (6)
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| US3811308A (en) * | 1966-02-14 | 1974-05-21 | Rotary Profile Anstalt | Profiling of workpieces |
| US6895795B1 (en) * | 2002-06-26 | 2005-05-24 | General Dynamics Ots (Garland), L.P. | Continuous severe plastic deformation process for metallic materials |
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| CN1446935A (en) * | 2003-01-10 | 2003-10-08 | 西北工业大学 | Method for preparing super fine crystal material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399808A (en) * | 2014-09-05 | 2015-03-11 | 合肥工业大学 | Device for realizing high-pressure twisting process on hydraulic press |
| CN104399808B (en) * | 2014-09-05 | 2016-05-11 | 合肥工业大学 | For realizing the device of high pressure torsion technique on hydraulic press |
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| CN1731131A (en) | 2006-02-08 |
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