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Grain refinement method and device thereof

A grain refinement and ultra-fine grain technology is applied in the field of grain refinement methods and refinement devices, which can solve the problems such as the decrease in the effect of grain refinement by equal-diameter angular extrusion, and achieve the effect of improving the effect.

Inactive Publication Date: 2011-01-26
WUHAN UNIV OF TECH
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Problems solved by technology

However, the existing research results show that as the billet size increases, the grain refinement effect of equal channel angle extrusion will decrease sharply.

Method used

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  • Grain refinement method and device thereof
  • Grain refinement method and device thereof

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Embodiment Construction

[0015] In the following, the grain refining method and the refining device of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments:

[0016] Such as figure 1 As shown, the grain refining device of the present invention includes an equal channel angular extrusion die 5 and an ultrasonic system. among them:

[0017] The inner diameter Φ of the equal channel angular extrusion die 5 satisfies Φ>20 mm, and the inner diameter Φ is equal to the diameter D of the blank 5 to be refined. Since D generally satisfies 20mm<D<100mm, Φ is also 20mm<Φ<100mm. This is because if the diameter D of the blank 5 is too large, a very large extrusion force will be required, and the requirements on the extrusion equipment and the equal channel angle extrusion die 5 are very high. Other structural parameters of the equal channel angular extrusion die 5 are the same as those of the conventional equal channel angular extrusion die.

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Abstract

The invention provides a grain refinement method, comprising the steps of carrying out equal-channel angular pressing on blanks and simultaneously subjecting the blanks to ultrasonic wave actions to obtain an ultrafine grain material. A grain refinement device is further provided, which comprises an equal-channel angular pressing mold and is characterized by further comprising an ultrasonic wave system, the distance between the output end of the ultrasonic wave system and the outlet of the equal-channel angular pressing mould is 0-500mm, and the output end of the ultrasonic wave system and the outlet of the equal-channel angular pressing mould are located on the same horizontal plane. Compared with the traditional equal-channel angular pressing model, by adopting the ultrasonic wave system, the invention ensures that a grain boundary is caused to vibrate violently and break under the action of ultrasonic waves when a material passes through the corner of the equal-channel angular pressing mould and is subjected to violent hearing deformation, thereby obviously improving the effect on fining grains and being particularly suitable for the preparation of large radial dimension nanocrystalline materials.

Description

Technical field [0001] The invention relates to the preparation of ultra-fine crystal or nanocrystalline materials, and specifically refers to a crystal grain refining method and a refining device using equal channel angular extrusion. Background technique [0002] Due to the superior mechanical properties of ultra-fine-grained metal materials such as high strength and high toughness, in recent decades, the use of severe plastic deformation methods to obtain ultra-fine-grained metal materials has attracted widespread interest from scholars at home and abroad. Among a variety of severe plastic deformation methods, equal channel angular extrusion (ECAP) is an advanced process for grain refinement. [0003] Equal channel angular extrusion is a method for the material to undergo severe shear deformation when passing through the intersection of two channels under pressure to realize the refinement of polycrystalline materials. Compared with other processes, equal channel angular extrus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/00C21D1/04
Inventor 华林刘艳雄魏文婷张小娜
Owner WUHAN UNIV OF TECH
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