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Method for preparing TC4 titanium alloy bolt through powder metallurgy

A technology of powder metallurgy and titanium alloy, applied in the direction of screws, mechanical equipment, threaded fasteners, etc., can solve the problems of insufficient tensile strength and elongation, reduced mechanical properties of titanium alloy, high oxygen content, etc., and achieve high density , Improve the overall performance and good mechanical properties

Active Publication Date: 2016-07-27
FUJIAN LONGXI BEARING (GROUP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, there are always unavoidable impurity elements in the raw materials of powder metallurgy titanium alloys, which mainly refers to oxygen elements, resulting in problems such as high oxygen content and residual pores in powder metallurgy titanium alloys, which make the mechanical properties of titanium alloys reduce
For example, in the powder metallurgy method of a Ti-6Al-4V alloy disclosed by the Chinese invention patent application number 201110098932.0, the inventor Yan Zhiqiao et al. use hydrogenation dehydrogenation titanium powder and elemental Al powder and V powder, through pressing and vacuum The powder metallurgy Ti-6A1-4V alloy material is prepared by sintering, and the density of the prepared material is 95.1-97.8%; but if it is used as a fastener, the density is not high, and the tensile strength and elongation are insufficient

Method used

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Examples

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preparation example Construction

[0029] A preparation method for powder metallurgy TC4 titanium alloy bolts, comprising the following steps:

[0030] 1) According to the composition ratio of TC4 titanium alloy bolts, weigh hydrogenated Ti powder and Al-V alloy powder and put them into the mixer, and mix them evenly under the protection of inert gas to obtain composite powder;

[0031] 2) The composite powder is subjected to wrapping cold isostatic pressing to obtain a cold-pressed billet;

[0032] 3) Put the cold-pressed bar into the vacuum sintering furnace, pump the vacuum degree of the vacuum sintering furnace to 0.005-0.01Pa, raise the temperature to 1300-1400°C and keep it for 1-3h to obtain the sintered billet;

[0033] 4) The sintered bar is subjected to hot extrusion treatment, and the hot extrusion temperature is 800-1000°C to obtain an extruded bar with a diameter of 5-20mm;

[0034]5) Carry out vacuum stress relief annealing on the extruded bar, the annealing vacuum degree is 0.005-0.01Pa, the ann...

Embodiment 1

[0049] A preparation method for powder metallurgy TC4 titanium alloy bolts, comprising the following steps:

[0050] 1) According to the composition ratio of TC4 titanium alloy bolts, weigh hydrogenated Ti powder with a particle size of -200 mesh and Al-V alloy powder with a particle size of -200 mesh, put them into a V-shaped mixer, and mix them evenly under the protection of argon gas. The time is 3h, and the composite powder is obtained; wherein, the mass ratio of Al and V in the Al-V alloy powder is 6:4;

[0051] 2) The composite powder is subjected to jacketed cold isostatic pressing at room temperature, the pressure of cold isostatic pressing is 150 MPa, and the holding time is 5 minutes to obtain cold pressed bars;

[0052] 3) Put the cold-pressed bar into the vacuum sintering furnace, pump the vacuum degree of the vacuum sintering furnace to 0.006Pa, raise the temperature to 1300°C and keep it for 4 hours to obtain the sintered bar;

[0053] 4) The sintered bar is sub...

Embodiment 2

[0059] A preparation method for powder metallurgy TC4 titanium alloy bolts, comprising the following steps:

[0060] 1) According to the composition ratio of TC4 titanium alloy bolts, weigh hydrogenated Ti powder with a particle size of -325 mesh and Al-V alloy powder with a particle size of -250 mesh, put them into a V-shaped mixer, and mix them evenly under the protection of argon gas. The time is 8h, and the composite powder is obtained; wherein, the mass ratio of Al and V in the Al-V alloy powder is 6:4;

[0061] 2) The composite powder is subjected to jacketed cold isostatic pressing at room temperature, the pressure of cold isostatic pressing is 180 MPa, and the holding time is 10 minutes to obtain cold pressed bars;

[0062] 3) Put the cold-pressed bar into the vacuum sintering furnace, pump the vacuum degree of the vacuum sintering furnace to 0.005Pa, raise the temperature to 1350°C and keep it for 2 hours to obtain the sintered bar;

[0063] 4) The sintered bar is su...

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Abstract

The invention relates to a method for preparing a TC4 titanium alloy bolt through powder metallurgy. Inert gas shielding is adopted for raw material mixing, and by combining sheath isostatic cool pressing treatment, middle-temperature vacuum sintering treatment, hot extrusion treatment, vacuum stress relieving treatment, hot upsetting treatment, solid solution aging treatment, machining, surface sand blasting and other technologies and strictly controlling the temperatures for the technologies, the full compact fine-grain powder metallurgy TC4 titanium alloy bolt is prepared. The method for preparing the TC4 titanium alloy bolt through powder metallurgy has the beneficial effects that the technological process is short, the energy consumption is little and equipment investment is small. The prepared TC4 titanium alloy bolt has the beneficial effects that cost is low, compactness is high, the strength of extension and ductility are enough, the mechanical performance is good, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy material forming, in particular to a preparation method of powder metallurgy TC4 titanium alloy bolts. Background technique [0002] Titanium alloy has the advantages of density, high strength, good fatigue resistance, excellent corrosion resistance, and non-magnetic properties, and is suitable for use as a bolt material. The weight reduction effect produced by the application of titanium alloy bolts is of great significance for improving the propulsion of aircraft and spacecraft, increasing travel, saving fuel, and reducing launch costs. Titanium alloy bolts not only have a strong demand in aviation and aerospace fields, but also because of their excellent corrosion resistance, they are widely used in shipbuilding (including submarines, etc.) Industrial fields have great application potential. In addition, titanium alloy bolts are also widely used in biomedicine, human implant materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00F16B35/00
Inventor 刘彬曾凡沛刘咏熊翔卢金忠
Owner FUJIAN LONGXI BEARING (GROUP) CO LTD
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