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Pure titanium two-step plastic deformation processing method

A technology of plastic deformation and processing method, applied in the field of two-step plastic deformation processing of pure titanium, can solve the problems of pure titanium fracture, unable to obtain large bulk fine-grained materials, etc. The effect of grain growth

Inactive Publication Date: 2009-11-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A literature search of the prior art found that S.L.Semiatin and D.P.Delo, etc. had published a paper on "The ECAE Process of Difficult-to-work Alloys" in "Materials and Design" (Equal channel angularextrusion of difficult-to-work alloys , Materials and Design 21(2000) 311-322), this paper carried out the ECAE process on hard-to-deform metals such as pure Ti, Ti-6Al-4V and 4340 steel, the author of this paper used a mold with a channel angle of 90°, The temperature range of 25°C to 325°C and the strain rate of 0.002 / S to 2 / S were selected to carry out the ECAE process on pure titanium. As a result, pure titanium is very sensitive to the shear localization in the ECAE process. At room temperature (25°C) When using any strain rate between 0.002 / S and 2 / S, the pure titanium will become fragments after the ECAE process; while at other temperatures (125°C to 325°C) when trying to perform the ECAE process on pure titanium However, due to the influence of factors such as extrusion temperature, strain rate, and unsuitable lubrication conditions, pure titanium will also be fractured to varying degrees after ECAE, so it is impossible to obtain large bulk fine-grained materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Using grade 3 industrial pure titanium as the raw material, anneal the pure titanium block at 750°C and keep it warm for 1 hour;

[0032] (2) Use an electric spark cutting machine to cut the pure titanium metal block into a blank with a cross-sectional size of 10mm×10mm and a length of 140mm. The surface of the blank is treated by mechanical polishing to achieve a surface accuracy of 4 or above, and the surface of the blank is processed. The roughness should not be lower than Ra=1.25μm;

[0033] (3) Clean the surface of the blank with acetone, place the blank on a clean stainless steel tray, preheat it at a temperature of 250°C for 15 minutes, and then apply a graphite lubricant on the surface of the blank by dip coating. To be uniform, the thickness of the coating is about 0.2mm. After coating, the blank should be dried at a temperature of 250°C for 15 minutes. If there are defects such as falling coating, scratches, and peeling, it should be re-coated or washed of...

Embodiment 2

[0039] (1) Using grade 3 industrial pure titanium as the raw material, anneal the industrial pure titanium block at 750°C and keep it warm for 1 hour;

[0040] (2) Use an electric spark cutting machine to cut the pure titanium metal block into a blank with a cross-sectional size of 10mm×10mm and a length of 140mm. The surface of the blank is treated by mechanical polishing to achieve a surface accuracy of 4 or above, and the surface of the blank is processed. The roughness should not be lower than Ra=1.25μm;

[0041] (3) Clean the surface of the blank with acetone, place the blank on a clean stainless steel tray, preheat it at a temperature of 300°C for 10 minutes, and then apply graphite lubricant on the surface of the blank by dip coating. Evenly, the coating thickness is about 0.3mm. After coating, the blank is dried at 300°C for 10 minutes. If there are defects such as falling coating, scratches, and peeling, it should be re-coated or washed off and re-coated;

[0042] (4...

Embodiment 3

[0047] (1) Using grade 3 industrial pure titanium as the raw material, anneal the industrial pure titanium block at 750°C and keep it warm for 1 hour;

[0048] (2) Use electric spark cutting machine to cut pure titanium metal block into blanks with cross-sectional size of 10mm×10mm and length of 140mm, and perform surface treatment on the blanks by mechanical polishing to achieve surface precision above grade 4, rough surface processing of blanks The thickness should not be lower than Ra=1.25μm;

[0049] (3) Clean the surface of the blank with acetone, place the blank on a clean stainless steel tray, preheat it at a temperature of 250°C for 15 minutes, and then apply graphite lubricant on the surface of the blank by dip coating. Uniform, coating thickness is about 0.4mm. After coating, dry the blank at 250°C for 15 minutes. If there are defects such as falling coating, scratches, peeling, etc., it should be re-coated or washed off and re-coated;

[0050] (4) Use acetone to cl...

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Abstract

The invention relates to a pure titanium two-step plastic deformation processing method in the technical field of metallic material plastic deformation; the method comprises the following steps: level-3 industrial pure titanium block is taken as the raw material, after being coated with graphite lubricant, the material is extruded on a 300KN hydraulic pressure universal experimental machine and then is subjected to rolling treatment at liquid nitrogen temperature to carry out deformation treatment on submicron crystal industrially pure titanium block, thus obtaining the superfine crystal pure titanium. The superfine crystal pure titanium of the invention features a tensile strength of 1218MPa and a specific elongation of 12.6%.

Description

technical field [0001] The invention relates to a processing method in the technical field of plastic deformation of metal materials, in particular to a two-step plastic deformation processing method for pure titanium. Background technique [0002] In recent years, the development of biomedical materials has attracted more and more attention from all over the world. Among biomedical materials, metal materials are the earliest to be used, mainly used to repair bones, joints, teeth, and blood vessels. Currently used in biomedical materials are mainly stainless steel, titanium and titanium alloys. Titanium has certain strength and high plasticity, and the σ of high-purity titanium b =300MPa, δ=40%, small density (4.51g / cm 3 ), the melting point is (1663±10)°C, and it has excellent corrosion resistance and heat resistance. At the same time, titanium is a non-magnetic metal and will not be magnetized in a large magnetic field. Titanium and its alloys also have an elastic modu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
Inventor 谢超英范志国江鸿
Owner SHANGHAI JIAO TONG UNIV
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