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Powder metallurgy preparation method of Fe-Mn-Al series alloy

A powder metallurgy and alloy powder technology, which is applied in the field of powder metallurgy preparation of Fe-Mn-Al series alloys, can solve the influence of heating rate and sintering temperature on structure and composition, affect material strength, plasticity and comprehensive mechanical properties, and is difficult to obtain high The density and other issues can be solved to achieve the effect of good oxidation resistance and corrosion resistance, light weight and anti-oxidation.

Inactive Publication Date: 2018-01-23
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the cost is high and it is difficult to obtain high density, which significantly affects the strength, plasticity and comprehensive mechanical properties of the material.
In addition, the heating rate and sintering temperature have a great influence on the structure and composition of the material, and the process is relatively complicated.

Method used

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  • Powder metallurgy preparation method of Fe-Mn-Al series alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The powder metallurgy preparation method of this Fe-Mn-Al series alloy, its specific steps are as follows:

[0020] (1) First, mix nano-scale aluminum powder, manganese powder and iron powder in a mass ratio of 11:25:64 to obtain Fe-Mn-Al mixed powder;

[0021] (2) Under the protection of argon, heat the Fe-Mn-Al mixed powder obtained in step (1) to 1450°C in an induction furnace to melt for 1 hour to obtain a qualified alloy liquid, and then inject the alloy liquid into the atomizing nozzle In the tundish of the tundish, the alloy liquid flows out from the leak hole at the bottom of the tundish at a flow rate of 1.8kg / min. When passing through the HK-03 ring hole nozzle, it meets the high-speed argon gas flow with a pressure of 6MPa and is atomized into fine droplets. The liquid droplets are rapidly solidified into Fe-Mn-Al alloy powder in the closed atomizing cylinder, and pass through a 100-point injection sieve;

[0022] (3) Compress the Fe-Mn-Al alloy powder obtai...

Embodiment 2

[0024] The powder metallurgy preparation method of this Fe-Mn-Al series alloy, its specific steps are as follows:

[0025] (1) First, mix nano-manganese aluminum powder, manganese powder and iron powder in a mass ratio of 10:20:70 to obtain Fe-Mn-Al mixed powder;

[0026] (2) Under the protection of argon, heat the Fe-Mn-Al mixed powder obtained in step (1) to 1450°C in an induction furnace to melt for 1 hour to obtain a qualified alloy liquid, and then inject the alloy liquid into the atomizing nozzle In the tundish of the tundish, the alloy liquid flows out from the leak hole at the bottom of the tundish at a flow rate of 1.8kg / min. When passing through the HK-03 ring hole nozzle, it meets the high-speed argon gas flow with a pressure of 6MPa and is atomized into fine droplets. The liquid droplets are rapidly solidified into Fe-Mn-Al alloy powder in the closed atomizing cylinder, and pass through a 100-point injection sieve;

[0027] (3) Compress the Fe-Mn-Al alloy powder o...

Embodiment 3

[0029] The powder metallurgy preparation method of this Fe-Mn-Al series alloy, its specific steps are as follows:

[0030] (1) First, mix nano-scale aluminum powder, manganese powder and iron powder in a mass ratio of 12:29:59 to obtain Fe-Mn-Al mixed powder;

[0031] (2) Under the protection of argon, heat the Fe-Mn-Al mixed powder obtained in step (1) to 1450°C in an induction furnace to melt for 1 hour to obtain a qualified alloy liquid, and then inject the alloy liquid into the atomizing nozzle In the tundish of the tundish, the alloy liquid flows out from the leak hole at the bottom of the tundish at a flow rate of 1.8kg / min. When passing through the HK-03 ring hole nozzle, it meets the high-speed argon gas flow with a pressure of 6MPa and is atomized into fine droplets. The liquid droplets are rapidly solidified into Fe-Mn-Al alloy powder in the closed atomizing cylinder, and pass through a 100-point injection sieve;

[0032] (3) Compress the Fe-Mn-Al alloy powder obtai...

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Abstract

The invention relates to a powder metallurgy preparation method of a Fe-Mn-Al series alloy, and belongs to the technical field of powder metallurgy preparation. The powder metallurgy preparation method comprises the steps that firstly aluminum powder, manganese powder and iron powder are evenly mixed to obtain Fe-Mn-Al mixed powder; under the protection of argon, the obtained Fe-Mn-Al mixed powderis smelted to be qualified alloy liquid, then the alloy liquid is injected into a tundish located above an atomizing nozzle, the alloy liquid flows out from a leakage hole in the bottom of the tundish and encounters high-speed argon airflow with the pressure being 6 MPa to be atomized to be small droplets when passing through an HK-03 type annular hole nozzle, the atomized droplets are rapidly solidified in a closed atomizing cylinder to be Fe-Mn-Al alloy powder, and the Fe-Mn-Al alloy powder passes through a label screen which is 100 meshes; and the obtained Fe-Mn-Al alloy powder is subjected to pressing forming, in the hydrogen environment, temperature is improved to 800-1200 DEG C and sintering is conducted for 4-8 h, after sintering is completed, furnace cooling is conducted till thetemperature reaches the room temperature, and a block-shaped Fe-Mn-Al alloy is obtained. According to the powder metallurgy preparation method, the corrosion resistance, the specific strength, the high-temperature oxidation resistance and the like of the obtained Fe-Mn-Al alloy are greatly improved.

Description

technical field [0001] The invention relates to a powder metallurgy preparation method for Fe-Mn-Al series alloys, belonging to the technical field of powder metallurgy preparation. Background technique [0002] Fe-Mn-Al alloy has high strength, light specific gravity, good corrosion resistance, high temperature oxidation resistance, high resistance, low electrical conductivity, and low price. It is a promising high-temperature Structural materials. At present, as ordered intermetallic compounds of high-temperature structural materials, the A 3 B aluminides of type AB. Fe-Al intermetallic compound, because it does not contain strategic elements, has low cost, excellent oxidation resistance, corrosion resistance and high high temperature strength. A single Fe-Al alloy material has low strength and high brittleness. Adding Mn element on the basis of Fe-Al intermetallic compound will generate DO 3 ([Fe, Mn] 3 Al), B2 ([Fe, Mn]Al) ordered phases, thereby significantly impr...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C22C33/02B22F9/08B22F3/10
Inventor 冯晶陈良刘亚会蒋业华罗翔种晓宇
Owner KUNMING UNIV OF SCI & TECH
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