Preparation method of ultrahigh fatigue strength powder metallurgy titanium and titanium alloy

A technology of fatigue strength and powder metallurgy, which is applied in the field of powder metallurgy titanium, can solve the problems of inability to process materials, poor fatigue performance, and low fatigue strength, and achieve the effects of improving the difficulty of expansion, large sintering driving force, and improving powder activity

Active Publication Date: 2021-06-11
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] However, the current commercially available powder metallurgy titanium alloy materials often have poor fatigue performance, mainly because pores will be generated inside the sintered ingot during the sintering process, so it is often necessary to increase the sintering temperature to 1200°C-1400°C to have a denser structure. However, if the sintering temperature is too high, the grains will grow, and the structure after sintering is mainly coarse Widmanstatten structure. Fatigue cracks can expand rapidly along the grain boundaries, resulting in low fatigue strength.
Studies have also shown that sintered ingots can be densified at lower temperatures by hot isostatic pressing, but hot isostatic pressing will bring about a sharp increase in cost, and materials with large aspect ratios cannot be processed

Method used

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  • Preparation method of ultrahigh fatigue strength powder metallurgy titanium and titanium alloy

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Embodiment 1

[0031] A preparation method of powder metallurgy titanium and titanium alloy with ultra-high fatigue strength, the specific preparation steps are as follows:

[0032] (1) Put the titanium sponge into a hydrogen furnace for hydrogenation treatment, the hydrogenation temperature is 350°C, and keep it warm for 10 hours to obtain titanium hydrogenation material;

[0033] (2) Mix the hydrogenated material described in step (1) with 6wt.% aluminum powder (~50 μm) and 4wt.% vanadium powder (~50 μm), and perform high-energy ball milling with a ball-to-material ratio of 4:1, The ball milling time is 12 hours, and after crushing, ultrafine titanium hydride alloy powder with a particle size of 10 μm and an oxygen content of 500 ppm is obtained;

[0034] (3) Put the ultra-fine hydrogenated titanium alloy powder described in step (2) into a vacuum sintering furnace for dehydrogenation treatment, the vacuum degree is 1 Pa, the dehydrogenation temperature is 800 ° C, and it is kept for 4 hou...

Embodiment 2

[0040] A preparation method of powder metallurgy titanium and titanium alloy with ultra-high fatigue strength, the specific preparation steps are as follows:

[0041] (1) Put the titanium sponge into a hydrogen furnace for hydrogenation treatment at a hydrogenation temperature of 800°C and keep it warm for 3 hours to obtain titanium hydride material;

[0042] (2) Combine hydrogenated material described in step (1) with 6wt.% aluminum powder (~500 μm), 2wt.% zirconium powder (~500 μm), 1wt.% molybdenum powder (~500 μm), 1wt.% Vanadium powder (~500 μm) was mixed and subjected to high-energy ball milling. The ball-to-material ratio was 10:1, and the ball milling time was 48 hours. After crushing, ultrafine titanium hydride alloy powder with a particle size of 1 μm and an oxygen content of 1000 ppm was obtained;

[0043] (3) Put the superfine titanium hydride alloy powder described in step (2) into a vacuum sintering furnace for dehydrogenation treatment, vacuum degree 10 -3 Pa, ...

Embodiment 3

[0049] A preparation method of powder metallurgy titanium and titanium alloy with ultra-high fatigue strength, the specific preparation steps are as follows:

[0050] (1) Put the titanium sponge into a hydrogen furnace for hydrogenation treatment at a hydrogenation temperature of 600°C and keep it warm for 5 hours to obtain titanium hydride material;

[0051] (2) Carrying out high-energy ball milling to the hydrogenated material described in step (1), the ball-to-material ratio is 8:1, the ball milling time is 24h, and after crushing, the obtained particle size is 5 μm ultrafine titanium hydride powder, and the oxygen content is 400 ppm;

[0052] (3) Put the superfine titanium hydride powder described in step (2) into a vacuum sintering furnace for dehydrogenation treatment, vacuum degree 10 -2 Pa, the dehydrogenation temperature is 650°C, and the temperature is kept for 7 hours to obtain ultrafine hydrogenated dehydrogenation titanium powder with a particle size of 5 μm and a...

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Abstract

The invention discloses a preparation method of ultrahigh fatigue strength powder metallurgy titanium and titanium alloy, and belongs to the field of powder metallurgy titanium. According to the method, an ultrahigh fatigue strength powder metallurgy titanium product is obtained from titanium sponge and alloy element powder as raw materials through hydrogenation, crushing, dehydrogenation, cold isostatic pressing, low-temperature vacuum sintering and high-temperature hot working. According to the method, low-temperature vacuum sintering of the powder metallurgy titanium alloy is achieved through the superfine titanium powder, sintered grains do not grow up, and due to the promoting effect of the fine powder on sintering, a sintered titanium blank does not crack in the subsequent hot working process. High temperature is adopted for hot working, the sintered titanium blank still has certain pores, and the pores hinder grain growth in the hot working process, so that uniform and fine equiaxed structures are obtained, the number of fine grain boundaries is increased, and the fatigue strength of the material is improved. The method is short in technological process, high in operability, suitable for industrial production and capable of effectively achieving application and popularization of the powder metallurgy titanium alloy.

Description

technical field [0001] The invention belongs to the field of powder metallurgy titanium, and provides a preparation method of powder metallurgy titanium and titanium alloy with ultrahigh fatigue strength. Background technique [0002] Titanium and its alloys have become important structural materials in cutting-edge fields such as aerospace and marine deep diving because of their excellent properties such as low density, high strength, and good corrosion resistance. However, in the long-term service process, due to periodic vibration and repeated stresses in all directions, the cumulative damage of titanium alloys will cause fatigue fracture of titanium alloys in advance. Therefore, it is urgent to develop titanium and titanium alloys with high fatigue strength. [0003] At present, the production process of conventional titanium alloy mainly includes smelting forging method, powder metallurgy method, additive manufacturing method and so on. Due to the active chemical prope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22F1/02C22F1/18B22F3/10B22F3/24B22F9/02
CPCC22C1/0458C22F1/183C22F1/02B22F9/023B22F3/1007B22F3/24B22F2003/248B22F2999/00B22F2201/20B22F2201/11
Inventor 杨芳芦博昕周洋郭志猛陈存广隋延力秦乾邵艳茹
Owner UNIV OF SCI & TECH BEIJING
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