Preparation method for difficult-to-deformation metal block material room temperature equal-diameter bending passage deformation

A technology of equal-diameter bending and difficult deformation, applied in the field of high-strength and difficult-to-deform metal blocks, it can solve the problems of affecting the grain refinement effect, complicated operation, complicated equipment, etc., achieving obvious grain refining effect and simplifying the process flow. , the effect of simple equipment

Inactive Publication Date: 2010-01-13
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

Equal-angle extrusion at high temperature is used to prepare industrially pure titanium blocks. Although a block-shaped fine-grained material with a smooth surface is finally obtained, recovery and recrystallization will occur when high-temperature ECAP is used for deformation, which will affect the grain fineness. In order to achieve the required strength, more passes of deformation must be carried out; and for high-temperature ECAP deformation, the preparation equipment required is relatively complicated, and the operation is also relatively complicated

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  • Preparation method for difficult-to-deformation metal block material room temperature equal-diameter bending passage deformation

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preparation example Construction

[0029] According to the technical scheme of the present invention, the method for preparing the deformation of the hard-to-deform metal block at room temperature isometric curved channel, comprises the following steps:

[0030] ① Use materials that are difficult to deform at room temperature - industrial pure titanium TA1 and TA2 hot-rolled plates as raw materials, and the hot-rolled plates must be annealed;

[0031] ② Cut the annealed industrial pure titanium TA1 and TA2 hot-rolled plates into billets, cut the head into a certain wedge angle, and polish the surface;

[0032] ③Apply lubricant on the surface of the billet;

[0033] ④Apply lubricant in the cavity of the equal-diameter curved channel deformation mold;

[0034] ⑤ Put the billet coated with lubricant into the channel of the equal-diameter curved channel deformation mold coated with lubricant, and then carry out room temperature equal-diameter curved channel deformation and extrusion deformation on the billet on th...

Embodiment 1

[0047] In this embodiment, industrial pure titanium (TA2) hot-rolled plates are used as raw materials, and the hot-rolled plates are annealed at 700° C., kept for 1 hour, and the annealed industrial pure titanium TA2 hot-rolled plates are cut into cross-sections by using a wire electric discharge machine. The size is 15mm×15mm, the length is 70mm blank, the head wedge is processed with a radius of 23.3mm, and the surface is polished, and the processing roughness is required to be Ra≤3.2μm. Then, the inner surface of the mold cavity (deformation channel) of the ECAP deformation mold with an outer fillet angle Ψ=20° at the blank surface and the channel included angle Ф=110° is uniformly coated with molybdenum disulfide and graphite composite lubricant (10% disulfide disulfide) Molybdenum and 90% graphite), after molybdenum disulfide and graphite powder are mixed evenly, add oily solvent, adjust into paste and apply to the surface of the blank and the mold cavity of the ECAP defor...

Embodiment 2

[0049] In this example, industrial pure titanium (TA1) hot-rolled plates are used as raw materials, and the hot-rolled plates are annealed at 700° C., kept for 1 hour, and the annealed industrial pure titanium TA1 hot-rolled plates are cut into cross-sections by wire electric discharge machine. The size is 15mm×15mm, the length is 70mm blank, the head wedge is processed with a radius of 25.5mm, and the surface is polished, and the processing roughness is required to be Ra≤3.2μm. Then, the inner surface of the mold cavity (deformation channel) of the ECAP deformation mold with an outer fillet angle Ψ=20° at the blank surface and the channel included angle Ф=110° is uniformly coated with molybdenum disulfide and graphite composite lubricant (10% disulfide disulfide) Molybdenum and 90% graphite), after molybdenum disulfide and graphite powder are mixed evenly, add oily solvent, adjust into paste and apply to the surface of the blank and the mold cavity of the ECAP deformation mold...

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Abstract

The invention discloses a preparation method for difficult-to-deformation metal block material room temperature equal-diameter bending passage deformation; the method selects industrially pure titanium hot-rolling sheet material as raw material; after annealing, the industrially pure titanium hot-rolling sheet material is cut into blank; and then surface finish treatment is carried out on the blank, the included angle of the blank is phi=90 degrees to 110 degrees with the passage, and the inner surface of the cavity of a mould, exterior round corner of which is psi=10 degrees to 45 degrees, is coated with compound lubricant comprising molybdenum disulfide and graphite; and finally ECAP deformation is carried out in the room temperature. The invention can increase the room temperature intensity of the pure titanium and the comprehensive mechanical property thereof; in the preparation process, the lesser deformation passage number can be utilized for generating obvious detailing effect, thus obtaining high-strength industrial pure titanium by utilizing lesser passage number, reducing the treatment cost of the pure titanium and increasing rate of finished products.

Description

technical field [0001] The invention relates to a method for preparing a high-strength and difficult-to-deform metal block at room temperature by using Equal Channel Angular Pressing (ECAP for short). Background technique [0002] Microstructure refinement is the most effective way to improve metal strength and comprehensive mechanical properties. When the material grains are refined to the nanocrystalline scale, not only the comprehensive mechanical properties will be improved, but also the physical and chemical properties will undergo significant changes. Large plastic deformation technology has a strong ability to refine grains, and can directly refine the internal structure of materials to submicron and even nanometer levels. It has been recognized by the material science community as the most promising method for preparing nano and high-strength materials. Isometric bending channel deformation is a severe plastic deformation method that can directly obtain bulk submicr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/00C22F1/18C21D7/00
Inventor 杨西荣赵西成刘晓燕王敬忠王耀宁杨占林王成王幸运
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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