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Preparation method of dispersion strengthened iron-based alloy powder

An iron-based alloy and dispersion-strengthening technology, applied in the field of preparation of dispersion-strengthened iron-based alloy powder, can solve the problems of uneven disperse phase, disperse phase segregation, inability to realize low-cost, large-scale production of strengthened iron-based alloy powder, etc. , to achieve the effect of simple process, low cost and wide application range

Inactive Publication Date: 2019-04-02
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the infiltration process of this method, the particle size and uniform effect of the dispersed phase are affected by the amount of solution used in the infiltration; too little solution will impede the infiltration, resulting in uneven dispersed phase, and too much solution will cause the dispersed phase to segregate , leading to the generation of large particles
[0007] In summary, the existing technology cannot achieve low-cost, large-scale production of reinforced iron-based alloy powders. Therefore, it is of great significance to develop a low-cost, easy-to-scale production of iron-based oxide dispersion-strengthened materials.

Method used

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Examples

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Effect test

preparation example Construction

[0022] A method for preparing a dispersion-strengthened iron-based alloy powder according to the present invention comprises the following steps:

[0023] 1) According to the composition requirements of dispersion strengthened iron-based alloy powder, industrial pure iron and intermediate alloys are used to prepare iron-based alloy raw materials, and the mass percentage of iron in industrial pure iron is ≥ 99%;

[0024] 2) Heat and melt the iron-based alloy raw material in a vacuum furnace, the melting temperature is not lower than 1750°C, and the vacuum degree is <1Pa; measure the oxygen activity of the iron-based alloy melt before the end of smelting. Deoxidize aluminum, and ensure that the oxygen activity of the iron-based alloy melt is ≤0.0004%;

[0025] 3) Import the iron-based alloy melt obtained in step 2) into the atomization bag, ensure that the temperature of the iron-based alloy melt is not lower than 1700°C before atomization, and then carry out atomization; The i...

Embodiment 1

[0035] In this example, the target composition of the prepared dispersion-strengthened iron-based alloy powder is: the weight percentage of each chemical element is: C 0.10%, Si 0.45%, Mn 0.34%, S 0.005%, P 0.004%, the rest is Fe and a small amount impurity elements.

[0036] According to the composition requirements of the dispersion-strengthened iron-based alloy powder, industrial pure iron and intermediate alloys are used to prepare iron-based alloy raw materials, and the mass percentage of iron in the industrial pure iron is 99.3%.

[0037] Heat and melt the iron-based alloy raw material in a vacuum furnace with a vacuum degree of 0.8 Pa. The oxygen activity measured before the end of smelting is 0.0010%, and after adding an appropriate amount of aluminum particles, the measured oxygen activity is 0.0003%, which meets the requirements of atomization and pulverization.

[0038] The obtained iron-based alloy melt is introduced into an atomizing bag, and the temperature of th...

Embodiment 2

[0044]The target composition of the dispersion strengthened iron-based alloy powder prepared in this example is: the weight percentage of each chemical element is: C 0.10%, Si 0.35%, Mn 1.55%, S 0.020%, P 0.010%, Nb 0.035%, and the rest is Fe and a small amount of impurity elements; according to the composition requirements of the dispersion-strengthened iron-based alloy powder, industrial pure iron and intermediate alloys are used to prepare iron-based alloy raw materials, and the mass percentage of iron in the industrial pure iron is 99.3%.

[0045] Heating and melting the iron-based alloy raw material in a vacuum furnace, the vacuum degree is 0.7Pa, the oxygen activity is measured as 0.0012% before the end of smelting, and the oxygen activity is measured as 0.0003% after adding an appropriate amount of aluminum particles, which meets the requirements of atomization powder making.

[0046] The obtained iron-based alloy melt is introduced into an atomizing bag, and the tempera...

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Abstract

The invention relates to a preparation method of dispersion strengthened iron-based alloy powder. The preparation method of the dispersion strengthened iron-based alloy powder comprises the followingsteps of 1, preparing the iron-based alloy raw material by taking industrial pure iron and intermediate alloy; 2, heating and melting the iron-based alloy raw material in a vacuum furnace; 3, introducing the iron-based alloy melt mass obtained in the step of 2 into an atomizing bag for atomization, and spraying oxide powder into liquid drops of the iron-based alloy by taking argon as a carrier while atomizing; and 4, after the atomization powder preparation process is completed, screening the obtained atomized powder, so that the dispersion strengthened iron-based alloy powder with the particle size being less than 75 micrometers is obtained and then packaged and stored. According to the preparation method of the dispersion strengthened iron-based alloy powder, when the iron-based alloy powder is prepared through atomization, the argon is adopted as a carrier to make the superfine oxide powder enter into the liquid drops of the iron-based alloy, and finally the iron-based alloy powdercontaining the dispersive oxide is formed after solidification; and the preparation method is simple, low in cost and easy to realize large-scale production.

Description

technical field [0001] The invention relates to the technical field of alloy powder preparation, in particular to a preparation method of dispersion-strengthened iron-based alloy powder. Background technique [0002] With the development of science and technology, various high-temperature machinery, aviation industry, and atomic energy industry have higher and higher requirements for high-temperature strength and wear resistance of heat-resistant materials. Oxide dispersion strengthened alloys have excellent high-temperature properties, and have recently attracted much attention and attention from the metallurgical industry. Oxide dispersion strengthening is achieved by introducing stable, uniform and fine oxide particles into the metal matrix. By pinning dislocations and hindering the movement of dislocations, the material can be strengthened, so that the dispersion-strengthened material can still have high strength and wear resistance near the melting point. [0003] Par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08
CPCB22F9/082C22C32/0026
Inventor 尚德礼廖相巍康磊吕春风贾吉祥白云波纪向军赵成林彭春霖
Owner ANGANG STEEL CO LTD