Large plastometric set method for producing ultra-fine crystal material

A large plastic deformation, ultra-fine grain technology, applied in the field of material plastic processing, can solve the problems of reducing the service life of the mold, increasing the production cost, and difficult to control the uniformity of the nanostructure, so as to prolong the service life, reduce the production cost, and improve the production. The effect of efficiency

Inactive Publication Date: 2008-10-29
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

However, the problem with this method is that five or more passes are required to accumulate strain to prepare ultra-fine-grained materials, and the uniformity of the nanostructure is difficult to control due to the repeated shearing of each pass.
The multi-pass extrusion using this method will also greatly reduce the service life of the mold and increase the production cost, which is not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The device used in the embodiment of the present invention includes two sets of molds, that is, a conventional compression mold and an equal channel angular extrusion mold in the prior art.

[0021] Among them, the compression mold includes: extrusion punch, upsetting cylinder, die cushion, mold base and support, and the inner cavity of the upsetting cylinder adopts a vertical cuboid: after putting the material to be processed into the mold, the extrusion punch Under the action, the height of the material is gradually reduced by the upsetting extrusion force, while the width direction is gradually increased until the material is deformed into a width that is the same as the original height, and the height is the same as the original width, that is, after the deformation of this pass, the shape of the material There is no change to facilitate deformation in the next pass. After extrusion, turn the support 180°. Since the inner cavity of the support is hollow, the punch co...

Embodiment 2

[0033] (1) Material preparation: select a sample of pure copper material, whose shape is a cuboid block, and whose size is 25mm×25mm×65mm;

[0034] (2) Homogenization annealing: After the sample in step (1) is annealed at 600°C for 1 hour, it is cooled to room temperature with the furnace;

[0035] (3) Upset extrusion deformation:

[0036] (A) Compression extrusion deformation: apply lubricant in the cavity of the compression mold according to the conventional amount, the lubricant ratio is: 1 gram of molybdenum disulfide per milliliter of engine oil, put the sample in the above (2) step into it, The extrusion speed is 5mm / s, and the extrusion force is gradually increased from 1 ton to 15 tons. The vertical height of the mold cavity is 90mm. After subtracting the height of the die pad, the extrusion punch After entering the mold cavity, there is a guide length of 15mm, and the width x length of the mold cavity is 25mm x 65mm. When the height of the extruded sample changes to ...

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Abstract

The invention provides a severe plastic deformation method for manufacturing ultra-fine grain material, which comprises an equal-channel angular extrusion step. The method is characterized in that the severe plastic deformation method has the following processing steps, namely the preparation of raw material, homogenizing annealing, compression extrusion deformation, equal-channel angular extrusion deformation, repeated upsetting-extrusion deformation, and annealing treatment. The shapes and sizes of the material before and after the extrusion deformation are the same so as to realize the multi-pass accumulated deformation; combining the other technologies, the disadvantages during the manufacture process of the ultra-fine grain material are effectively avoided because of absorbing the advantages of a equal-channel angular extrusion method, thereby realizing that the uniform ultra-fine grain microstructure material can be obtained after less-pass upsetting-extrusion deformation; therefore, the uniform and stable ultra-fine grain bulk material is obtained, in addition, the productivity effect is increased obviously, the service life of an extrusion die is prolonged, the manufacturing cost is lowered, and the severe plastic deformation method is favorable for realizing large-scale industrial production at the same time.

Description

technical field [0001] The invention relates to a method for preparing ultrafine-grained materials, in particular to a large plastic deformation method for preparing massive uniform ultrafine-crystalline materials, and belongs to the technical field of material plastic processing. Background technique [0002] In recent years, large plastic deformation technology (Severe Plastic Deformation, SPD) has attracted the attention of researchers from various countries because of its ability to prepare ultra-fine-grained materials with ultra-fine grain size, unique microstructure, and excellent mechanical and physical properties. The technology developed rapidly. However, from the perspective of practical industrial application, the preparation of ultra-fine-grained materials with uniform structure through low-cost processes is the main problem of large plastic deformation technology. Among the existing large plastic deformation methods, equal channel angular pressing (ECAP) is a r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/13C22F1/00
CPCY02P10/20
Inventor 史庆南顾振华起华荣王效琪
Owner KUNMING UNIV OF SCI & TECH
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