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High-fatigue-property titanium alloy for mountain bike frames

A mountain bike and fatigue performance technology, applied in the field of titanium alloy materials, can solve the problems of heavy product weight, high production cost, and high cost, and achieve the effects of excellent strength and plasticity, excellent cost performance, and reduced content

Active Publication Date: 2013-12-11
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation technology of titanium mountain bikes in foreign countries is relatively mature, and Ti-3Al-2.5V titanium alloy pipes are mostly used to prepare mountain bike frames. Its comprehensive performance is good, but the production cost is high, and the wall thickness of the prepared frame is relatively thick. Defects such as heavy product weight, high cost, and low lifespan
[0004] Domestic research on titanium mountain bikes has been carried out for many years. Although Ti-3Al-2.5V titanium alloy is also used to prepare the frame body, it has not been able to break through the low-cycle fatigue performance assessment bottleneck of lightweight titanium frames. Fatigue loading frequency f≤15Hz, tension F 1 =1200N, pressure F 2 =600N, the assessment requirements for its fatigue life N≥50000 times

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The nominal composition of the titanium alloy in this example is: Ti-3Al-1.7V-1Cr-0.5Fe, that is, Al3.0%, V1.7%, Fe0.5%, Cr1.0%, and the balance by weight percentage For Ti and unavoidable impurities.

[0025] The preparation method of the titanium alloy in this example is as follows: the ingredients are proportioned according to the nominal composition Ti-3Al-1.7V-1Cr-0.5Fe, and the raw materials are Al-55V master alloy, electrolytic chromium, ferric oxide powder and aluminum beans. After mixing the materials, the electrodes are pressed, and the alloy ingots are obtained by secondary melting in a vacuum consumable electric arc furnace. Control the mass content of ingot impurity elements C≤0.1%, N≤0.03%, H≤0.15%, O≤0.15%. After the alloy ingot is peeled off and the riser and tail end are cut off, it is forged at 1100 °C on the open die forging equipment, and the alloy ingot is forged at T β -50℃~T β -30 ℃ forged into Ф105mm bars after multi-fire piercing. The bar is...

Embodiment 2

[0028] The nominal composition of the titanium alloy in this embodiment is: Ti-3Al-2V-2Cr-1Fe, that is, Al3.0%, V2.0%, Fe1.0%, Cr2.0% by weight percentage, and the balance is Ti and unavoidable impurities.

[0029] The preparation method of the titanium alloy in this example is as follows: the ingredients are proportioned according to the nominal composition Ti-3Al-2V-2Cr-1Fe, and the raw materials are Al-85V master alloy, electrolytic chromium, ferric oxide powder and aluminum beans. After mixing the materials, the electrodes are pressed, and the alloy ingots are obtained by secondary melting in a vacuum consumable electric arc furnace. Control the content of impurity elements in the ingot C≤0.1%, N≤0.03%, H≤0.15%, O≤0.15%. After the ingot is stripped and the riser and tail end are cut off, it is forged at 1150°C on the free forging equipment. β -50℃~T β -30 ℃ forged into Ф105mm bars after multi-fire piercing. The bar is prepared into a Ф65mm×5mm tube blank by conventiona...

Embodiment 3

[0032] The nominal composition of the titanium alloy in this embodiment is: Ti-3.2Al-1.5V-1.5Cr-0.75Fe, that is, Al3.2%, V1.5%, Fe0.75%, Cr1.5% by weight percentage, The balance is Ti and unavoidable impurities.

[0033] The preparation method of the titanium alloy in this example is as follows: according to the nominal composition Ti-3.2Al-1.5V-1.5Cr-0.75Fe ingredients, the raw materials are Al-55V master alloy, electrolytic chromium, ferric oxide powder and aluminum beans. After mixing the materials, the electrodes are pressed, and the alloy ingots are obtained by smelting three times in a vacuum consumable electric arc furnace. Control the content of impurity elements in the ingot C≤0.1%, N≤0.03%, H≤0.15%, O≤0.15%. After the ingot is peeled off and the riser and tail end are cut off, it is forged at 1100°C on the free forging equipment. β -50℃~T β -30 ℃ forged into Ф135mm bars after multi-fire piercing. The bar is prepared into a Ф65mm×5mm tube blank by conventional dou...

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PUM

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Abstract

The invention provides a high-fatigue-property titanium alloy for mountain bike frames, which is composed of the following components in percentage by mass: 2.5-3.5% of Al, 1.0-2.0% of V, 0.3-2.0% of Fe, 0.6-4.0% of Cr and the balance of Ti and inevitable impurities. After the titanium alloy is subjected to heat treatment, under the conditions that the horizontal fatigue loading frequency f is less than or equal to 15Hz, the tensile force F1 is equal to 1200N and the pressure F2 is equal to 600N, the fatigue life N is greater than or equal to 50000 times, thereby satisfying the related technical requirements in European Standard EN14766-2005. Compared with the traditional titanium alloy for mountain bike frames, the titanium alloy provided by the invention has the advantages of high strength, favorable plasticity, high fatigue property, low production cost and the like, can obviously prolong the service life of the mountain bike, and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy materials, and in particular relates to a high-fatigue titanium alloy for a mountain bike frame. Background technique [0002] Since the invention of mountain bikes in 1977, light weight, high strength and long life have been the goals pursued by many mountain bike manufacturers. Titanium alloy has many advantages such as low density, high strength, high and low temperature resistance, corrosion resistance, etc., especially the specific strength is higher than that of magnesium and aluminum alloy, so it has always been the research and development direction in the bicycle field, and it is an ideal mountain bike frame. Material. [0003] At present, the preparation technology of titanium mountain bikes in foreign countries is relatively mature, and Ti-3Al-2.5V titanium alloy pipes are mostly used to prepare mountain bike frames. Its comprehensive performance is good, but the production cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/02
Inventor 赵彬葛鹏郭荻子赵恒章杨英丽杜宇吴金平苏杭标
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH