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Tungsten (molybdenum) alloy with double-size grains, preparation method of tungsten (molybdenum) alloy and stirring tool for friction stir welding

A dual-size, grain-based technology, applied in manufacturing tools, metal processing equipment, welding equipment, etc., can solve the problems of difficult boron nitride processing, large grain size, and high cost

Active Publication Date: 2021-10-29
CHINA-UKRAINE INST OF WELDING GUANGDONG ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cobalt-based materials are easy to shape and prepare, but have poor wear resistance. After high-temperature stirring, the tool has lost its original geometric shape and turned into a mushroom head shape, and the material is obviously unstable.
Polycrystalline hexagonal boron nitride is difficult to process, and it will react chemically with titanium, which makes the chemical corrosion of the boron nitride stirring head serious
Tungsten-based alloys are mainly tungsten-rhenium alloy (W-25Re) and dispersion-strengthened tungsten-rhenium alloy (W-25Re-1HfC), but the cost of this material is extremely high, and the wear resistance at high temperature still exists
[0004] Moreover, the ductility of the traditional tungsten-rhenium alloy at room temperature is only less than 10%, and there are problems of poor ductility, large grain size and poor low-temperature toughness, and the strength and toughness of the stirring head cannot be guaranteed at the same time, so that the tungsten-rhenium alloy is used to prepare When the obtained stirring head is inserted into the material to be welded, the instantaneous impact will cause macroscopic cracks in the material

Method used

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  • Tungsten (molybdenum) alloy with double-size grains, preparation method of tungsten (molybdenum) alloy and stirring tool for friction stir welding
  • Tungsten (molybdenum) alloy with double-size grains, preparation method of tungsten (molybdenum) alloy and stirring tool for friction stir welding
  • Tungsten (molybdenum) alloy with double-size grains, preparation method of tungsten (molybdenum) alloy and stirring tool for friction stir welding

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preparation example Construction

[0042]An embodiment of the present invention provides a tungsten (molybdenum) alloy with double-sized grains. The tungsten (molybdenum) alloy with double-sized grains is a solid solution prepared by tungsten (molybdenum) rhenium alloy powder, titanium powder and carbon powder. Alloys prepared. And specifically, the preparation method for preparing the tungsten (molybdenum) alloy with double-sized grains includes: performing high-energy ball milling on a mixture of tungsten (molybdenum) rhenium alloy powder, titanium powder and carbon powder to obtain solid solution powder; The molten powder is sequentially subjected to cold isostatic pressing, hot isostatic pressing sintering, forging and annealing to obtain a tungsten (molybdenum) alloy with double-sized grains.

[0043] In detail, from the point of view of material design, the raw materials for the preparation of the double-sized grain tungsten (molybdenum) alloy are tungsten (molybdenum) rhenium alloy powder, titanium powde...

Embodiment 1

[0058] This embodiment provides a stirring tool for friction stir welding, which is prepared by a tungsten alloy with double-sized grains, and the tungsten alloy with double-sized grains is prepared by the following method:

[0059] S1: Under the protection of high-purity argon, the mixture of tungsten-rhenium alloy powder, titanium powder and carbon powder is subjected to high-energy ball milling to obtain solid solution powder. The time is 5h; wherein, the particle size of the tungsten-rhenium alloy powder is 3μm; the titanium powder is nano-titanium powder, the average grain size is 40μm, and the particle size is 50nm, and the amount of titanium powder is 0.3% of the total mass of solid solution powder. %; the amount of carbon powder is 0.005% of the total mass of the solid solution powder; and in the tungsten-rhenium alloy powder, the tungsten element accounts for 80%, and the rhenium element accounts for 20%;

[0060] S2: Carry out cold isostatic pressing operation, where...

Embodiment 2

[0065] This embodiment provides a stirring tool for friction stir welding, which is prepared by a molybdenum alloy with double-sized grains, and the molybdenum alloy with double-sized grains is prepared by the following method:

[0066] S1: Under the protection of high-purity argon, the mixture of molybdenum-rhenium alloy powder, titanium powder and carbon powder is subjected to high-energy ball milling to obtain solid solution powder. The time is 10h; among them, the particle size of the molybdenum-rhenium alloy powder is 10μm; the titanium powder is TiH 2 Powder, the average grain size is 40-60μm, the particle size is 30-45μm, the amount of titanium powder is 1% of the total mass of the solid solution powder; the carbon powder is nano-carbon powder, the particle size is 50nm, the carbon powder The dosage is 0.1% of the total mass of the solid solution powder; in the molybdenum-rhenium alloy, the molybdenum element accounts for 90%, and the rhenium element accounts for 10%; ...

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Abstract

The invention discloses a tungsten (molybdenum) alloy with double-size grains, a preparation method of the tungsten (molybdenum) alloy and a stirring tool for friction stir welding, and relates to the field of metal materials. The tungsten (molybdenum) alloy with the double-size grains is an alloy obtained by continuously preparing solid-solution-state powder prepared from tungsten (molybdenum) rhenium alloy powder, titanium powder and carbon powder; and in the tungsten (molybdenum) alloy with the double-size grains, the range of the small grains is controlled to range from 1.0 micrometer to 5.0 micrometers, the volume fraction of the small grains ranges from 40% to 70%, the size of the large grains is controlled to range from 20 micrometers to 100 micrometers, the ratio of the large grains ranges from 30% to 40%, and the average size of second-phase particles ranges from 20 nm to 50 nm. The tungsten (molybdenum) alloy with the double-size grains has the grains of two sizes, the high strength of the tungsten (molybdenum) alloy can be guaranteed through the thin and small equiaxed grains, channels can be provided for dislocation through the thick and large grains, the tungsten (molybdenum) alloy has the high tensile plasticity and toughness, and therefore the tungsten (molybdenum) alloy has the advantages of being high in strength and toughness at the same time.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a tungsten (molybdenum) alloy with double-sized grains, a preparation method thereof, and a stirring tool for friction stir welding. Background technique [0002] Friction Stir Welding (FSW) is a new type of solid phase joining technology. During the welding process, the nugget area does not melt, which can avoid the appearance of coarse grain structure and ceramic particle strengthening phase (such as Y 2 o 3 、Al 2 o 3 ) and molten matrix delamination and other issues. Therefore, FSW has unique advantages in welding aluminum, magnesium low melting point materials, ultra-fine grain steel, particle dispersion strengthened steel and titanium alloy. However, the application of FSW in the connection of high melting point materials is limited. One of the main reasons is that the structure of the stirring head material is unstable and the function fails. As the core component of FSW...

Claims

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Application Information

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IPC IPC(8): B22F1/00C22C1/05C22C27/04B22F9/04B22F3/04B22F3/15B22F3/17B22F3/24B23K20/12
CPCC22C1/058C22C27/04B22F9/04B22F3/04B22F3/15B22F3/17B22F3/24B23K20/12B22F2003/175B22F2009/043B22F2003/248Y02P10/25
Inventor 苗澍向鑫赵运强董春林林志成刘莉刘喆
Owner CHINA-UKRAINE INST OF WELDING GUANGDONG ACAD OF SCI
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