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Manufacturing method for reducing anisotropism of pure-titanium sheet strip for deep drawing

A technology of anisotropy and manufacturing method, applied in the field of metallurgy, can solve the problems of ear making and wrinkling, and achieve the effect of good deep drawing performance and low product anisotropy

Inactive Publication Date: 2020-07-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a manufacturing method for reducing the anisotropy of pure titanium thin strips for deep drawing, so as to improve the serious anisotropy of industrial pure titanium thin strips and avoid defects such as earing and wrinkling during forming processing

Method used

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  • Manufacturing method for reducing anisotropism of pure-titanium sheet strip for deep drawing
  • Manufacturing method for reducing anisotropism of pure-titanium sheet strip for deep drawing
  • Manufacturing method for reducing anisotropism of pure-titanium sheet strip for deep drawing

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Hot-rolled TA1 industrial pure titanium strip with a thickness of 3.5mm, the mass fraction of each chemical composition is: C≤0.07%; N≤0.05%; O≤0.11%; H≤0.015%; Fe≤0.15%; other elements ≤0.40 %; the balance is titanium. Its α→β phase transition temperature is 890°C.

[0022] The steps adopted in the manufacturing method for reducing the anisotropy of the pure titanium sheet strip for deep drawing include:

[0023] Take the above-mentioned hot-rolled TA1 industrial pure titanium strips a, b and c whose surfaces have been pickled by shot blasting, and send the three pieces to the cold rolling mill for unidirectional longitudinal rolling respectively to form an intermediate billet with a thickness of 1.1 mm. The intermediate billet is heat treated separately: the intermediate billet a (process 1) is heated to 650°C for recrystallization and annealed, and then rapidly gas-cooled in a protective atmosphere; the intermediate billet b (process 2) is heated to 920°C, held for ...

Embodiment 2

[0029] TA1 industrial pure titanium strip with a thickness of 4.0mm after hot rolling, shot blasting and pickling, the mass fraction of each chemical component is: C≤0.08%; N≤0.05%; O≤0.10%; H≤0.010%; Fe≤0.12%; other elements≤0.40%; the balance is titanium. Its α→β phase transition temperature is 895°C.

[0030] The steps adopted in the manufacturing method for reducing the anisotropy of the pure titanium sheet strip for deep drawing include:

[0031] Take three qualified cold-rolled TA1 billets d, e and f, and send them into a cold rolling mill for unidirectional longitudinal rolling to a thickness of 1.6mm. The intermediate billet is heat treated separately: the intermediate billet d (process 4) is heated to 650°C for recrystallization annealing, and then gas-cooled under a protective atmosphere; the intermediate billet e (process 5) is heated to 900°C, held for 1 to 10 minutes, and then gas-cooled; The intermediate billet f (process 6) adopts two heat treatments, each tim...

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Abstract

The invention provides a manufacturing method for reducing the anisotropism of a pure-titanium sheet strip for deep drawing, and belongs to the field of mechanical metallurgy of materials. The manufacturing method comprises the steps that a hot-rolled or cold-rolled titanium sheet strip is heated to be higher than a beta phase-change temperature by 0-40 DEG C, is maintained at the temperature for0.1-10min, and then cooled to the room temperature; then, one pass of cold-rolling deformation is conducted in the original rolling direction; and afterwards, recrystallization annealing is conductedto obtain the pure-titanium sheet strip for deep drawings, wherein the yield strength of the pure-titanium sheet strip for deep drawing in the rolling direction and the horizontal direction is smallerthan 35MPa, and the absolute deviation of the percentage elongation after fracture is smaller than 5%. The base surface (0001) in the tissue of the pure-titanium sheet strip manufactured through themethod contains many texture components, and the proportion of large-angle twin boundaries in a grain orientation differential distribution diagram is high. The anisotropism of the yield strength andpercentage elongation after fracture of the pure-titanium sheet strip is low, and the formation performance is good.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a manufacturing method for reducing the anisotropy of a pure titanium sheet strip for deep drawing. Background technique [0002] Due to low density, high specific strength and good corrosion resistance, titanium and titanium alloys are more and more widely used in the fields of energy, military industry and aerospace. The TA1 thin strip that has been cold-rolled and annealed after hot-rolling is mainly used in condensers and plate heat exchangers in power stations, as well as in the manufacture of deep-drawn titanium products for household use, accounting for more than half of the processed materials. [0003] TA1 belongs to α-Ti with a close-packed hexagonal structure at room temperature, and is composed of cylindrical surfaces during slip deformation. Slip and base The combined action of slip produces the slip of the second-order pyramidal surface <c+a>, and there are ...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C14/00
CPCC22C14/00C22F1/183
Inventor 余伟张家铭程磊陈雨来程知松韩盈王云龙
Owner UNIV OF SCI & TECH BEIJING
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