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Severe plastic deformation method and severe plastic deformation device for pressing and rolling corner of non-equivalent passage

A technology of equal channel corners and non-equal channel channels, applied in the field of channel corner extrusion drastic plastic deformation method and its device, can solve the problems of poor material stress state, limit of total strain, material strength decrease, etc., and achieve good stress state, The effect of low manufacturing cost and extended life

Inactive Publication Date: 2012-11-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, rapid plastic deformation technology has developed rapidly, mainly including: equal channel angular extrusion (ECAP), cumulative stack rolling (ARB), high pressure torsion (HPT), reciprocating extrusion (CEC) and other technologies, among which ECAP technology is the use of A mold composed of two intersecting and equal-section channels can obtain a large pure shear deformation of the metal, and the shape and size of the sample will not change before and after deformation, but the problem with this method is that more passes are required To accumulate strain to prepare ultra-fine-grained materials, and for some materials, such as magnesium alloys, texture weakening will occur after multiple passes of deformation, resulting in a decrease in material strength
The ARB technology is to carry out multi-pass rolling for the plate, and compress the material to improve the performance of the material, but the stress state of the material under this process is poor, and edge cracks are prone to occur, and with the increase of the compression vector The size of the material is reduced accordingly, so its total strain will be limited
Integrating the advantages of the above-mentioned equal channel angular extrusion technology and cumulative stacking rolling technology, the rapid plastic deformation technology of non-equal channel angular extrusion with both shear deformation and compression deformation has not been reported so far.

Method used

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  • Severe plastic deformation method and severe plastic deformation device for pressing and rolling corner of non-equivalent passage
  • Severe plastic deformation method and severe plastic deformation device for pressing and rolling corner of non-equivalent passage
  • Severe plastic deformation method and severe plastic deformation device for pressing and rolling corner of non-equivalent passage

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Embodiment 1

[0027] The non-equal-channel angular extrusion and acute plastic deformation method of the present invention integrates the equal-channel angular extrusion technology and the cumulative stacking rolling technology, and specially designs a non-equal-channel angular extrusion method for realizing the non-equal-channel angular extrusion rapid plastic deformation method Hyperplastic deformation devices, such as figure 1 shown. The mold part of the device is as figure 2 , 3 As shown, the non-equal channel means that the mold of the device is provided with two intersecting and non-equal cross-section I channel 6 and II channel 9, I channel 6 is perpendicular to the upper end surface of the mold, and II channel 9 and I channel 6 form a clamp Angle, the inner angle of the channel Φ=90°, the outer angle Ψ=0°. The width W of the I channel 6 and the II channel 9 is the same, W is 50 mm, and the thickness L of the I channel 6 1 Thickness L greater than II channel 9 2 , and L 1 for ...

Embodiment 2

[0038] The materials used in this embodiment are the same as in Embodiment 1, and the structural parameters of the mold part of the non-equal channel angle extrusion device are selected as follows: L 1 / L 2 =2, L 1=20mm, channel inner angle Φ=120°, outer angle Ψ=30°, the non-equal channel angular rolling acute plastic deformation device is the same as that of embodiment 1 except for the structural parameters of the above-mentioned mold part. The specific steps and process conditions of the rapid plastic deformation method of non-equal channel angular extrusion of Mg-Li-Al alloy plates are the same as in Example 1, and the mechanical properties of the material obtained in this example after completing multi-pass extrusion deformation are shown in Table 2. .

[0039] Table 2

[0040]

Embodiment 3

[0042] The materials used in this embodiment are the same as in Embodiment 1, and the structural parameters of the mold part of the non-equal channel angle extrusion device are selected as follows: L 1 / L 2 =4, L 1 = 20mm, channel inner angle Φ = 160°, outer angle Ψ = 45°, non-equal channel angular extrusion and rapid plastic deformation device is the same as that of embodiment 1 except for the structural parameters of the above-mentioned mold part.

[0043] Except for the following parameters, the specific steps and process conditions of the method for the rapid plastic deformation of the non-equal channel angular extrusion of the Mg-Li-Al alloy plate are the same as in Example 1:

[0044] After the Mg-Li-Al alloy plate is deformed one by one, it is cut into L along the length direction. 1 / L 2 = 4 parts were stacked along the thickness direction and placed in channel I 6, the above steps were repeated, and the mechanical properties of the material obtained in this embodim...

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Abstract

The invention discloses a severe plastic deformation method and a severe plastic deformation device for pressing and rolling the corner of a non-equal channel. According to the severe plastic deformation method and the severe plastic deformation device for pressing and rolling the corner of the non-equal channel, an equal-channel angular pressing (ECAP) technology and an ARB (Accumulative Roll Bonding) technology are integrated. The concrete process comprises the following steps that pressing force is applied after a test sample, a punching head and a mould are simultaneously preheated to pressing and rolling temperature, so that the test sample passes through the position of the channel corner of the device for pressing and rolling the corner of the non-equal channel completely; compressive deformation is generated when shear deformation is generated by the test sample so as to finish a first pass pressing and rolling process; the test sample is cut into L1 / L2 parts along a length direction, and the L1 / L2 parts are placed in an I channel; and the steps are repeated so as to finish multi-pass pressing and rolling deformation. The mould of the device is provided with the I channel and an II channel which are intersected and also have non-equal sections. The design is reasonable, the structure is simple, and the manufacturing cost is low. According to the method disclosed by the invention, the advantages of the ECAP technology and the ARB technology are integrated, and the mechanical property of a material is effectively enhanced. The process is short in procedure, high in efficiency and low in cost and is simple to operate. The severe plastic deformation method and the severe plastic deformation device for pressing and rolling the corner of the non-equal channel can be widely used for the field of processing metal materials, such as pure metal and alloy.

Description

technical field [0001] The invention relates to the technical field of plastic processing of materials, in particular to a non-equal channel corner extrusion method and a device thereof for rapid plastic deformation. Background technique [0002] Severe Plastic Deformation (SPD) has a strong ability to refine grains and can directly refine the internal structure of materials to submicron or even nanometer levels. and the most promising approach for ultrafine-grained materials. In recent years, rapid plastic deformation technology has developed rapidly, mainly including: equal channel angular extrusion (ECAP), cumulative stack rolling (ARB), high pressure torsion (HPT), reciprocating extrusion (CEC) and other technologies, among which ECAP technology is the use of A mold composed of two intersecting and equal-section channels can obtain a large pure shear deformation of the metal, and the shape and size of the sample will not change before and after deformation, but the prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/02B21C25/02
Inventor 康志新林楷王芬
Owner SOUTH CHINA UNIV OF TECH
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