Preparation method of Ni-Cr-Al-Fe-series high-temperature alloy

A technology of high-temperature alloys and alloys, applied in the field of high-temperature alloys, to achieve good fatigue performance, simple process, and good high-temperature strength

Active Publication Date: 2018-06-15
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the technical problems in the preparation of existing Ni-Cr-Al-Fe superalloys, the present invention provides a method for preparing Ni-Cr-Al-Fe superalloys. The present invention uses high-purity metal powder, and the raw materials are made by vacuum ball milling. Mix evenly, press the mixed powder into billet, and then smelt in vacuum arc melting equipment, add electromagnetic stirring during the smelting process, so that the melt is completely homogenized, use high-purity powder and electromagnetic stirring for smelting, can significantly Improve the purity and density of the alloy, thereby significantly improving its strength, plasticity and comprehensive mechanical properties; the Ni-Cr-Al-Fe alloy prepared by the method of the present invention has good high-temperature strength, excellent oxidation resistance, and good fatigue performance , fracture performance and other advantages, can be used in aerospace industry, automobile industry and marine devices and other fields

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Effect test

Embodiment 1

[0018] Embodiment 1: a kind of preparation method of Ni-Cr-Al-Fe series superalloy, concrete steps are as follows:

[0019] (1) Iron powder, chromium powder, aluminum powder and nickel powder were ball milled for 5 hours and mixed to obtain a mixed material; in terms of mass percentage, iron powder accounted for 4.5%, chromium powder accounted for 18.0%, and aluminum powder accounted for 5.5% in the mixed material, The rest is nickel powder; the purity of iron powder, chromium powder, aluminum powder and nickel powder is 99.99%, and the chromium powder, aluminum powder, iron powder and nickel powder are all passed through a 300-mesh sieve; the ball-to-material ratio of the ball mill is 12:1;

[0020] (2) Under the condition of a pressure of 20MPa, the mixed material obtained in step (1) is compressed into a sheet to obtain a metal sheet of φ15×3, and the metal sheet is placed in a vacuum arc melting furnace, under the protection atmosphere of argon gas and electromagnetic stirr...

Embodiment 2

[0024] Embodiment 2: a kind of preparation method of Ni-Cr-Al-Fe series superalloy, concrete steps are as follows:

[0025] (1) Mix iron powder, chromium powder, aluminum powder and nickel powder by ball milling for 6 hours to obtain a mixed material; in terms of mass percentage, the iron powder in the mixed material accounts for 3.0%, chromium powder accounts for 15.0%, and aluminum powder accounts for 5.0%. The rest is nickel powder; the purity of iron powder, chromium powder, aluminum powder and nickel powder is 99.0%, and the chromium powder, aluminum powder, iron powder and nickel powder are all passed through a 300-mesh sieve; the ball-to-material ratio of the ball mill is 10:1;

[0026] (2) Under the condition of a pressure of 50MPa, the mixed material obtained in step (1) is pressed into a sheet to obtain a metal sheet of φ15×3, and the metal sheet is placed in a vacuum arc melting furnace, under the protection atmosphere of argon gas and electromagnetic stirring. Arc ...

Embodiment 3

[0029] Embodiment 3: a kind of preparation method of Ni-Cr-Al-Fe series superalloy, concrete steps are as follows:

[0030] (1) Iron powder, chromium powder, aluminum powder and nickel powder were ball milled for 7 hours to obtain a mixed material; in terms of mass percentage, iron powder accounted for 6.0%, chromium powder accounted for 20.0%, aluminum powder accounted for 6.0% in the mixed material, The rest is nickel powder; the purity of iron powder, chromium powder, aluminum powder and nickel powder is 99.5%, and the chromium powder, aluminum powder, iron powder and nickel powder are all passed through a 300-mesh sieve; the ball-to-material ratio of the ball mill is 15:1;

[0031] (2) Under the condition of a pressure of 40MPa, the mixed material obtained in step (1) is pressed into a sheet to obtain a metal sheet of φ15×3, and the metal sheet is placed in a vacuum arc melting furnace, under the protection atmosphere of argon gas and electromagnetic stirring. Arc melting ...

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Abstract

The invention discloses a preparation method of a Ni-Cr-Al-Fe-series high-temperature alloy, and belongs to the technical field of a high-temperature alloy. The method comprises: uniformly mixing ironpowder, chromium powder, aluminium powder and nickel powder via ball milling to obtain a mixed material; in a condition with the pressure in a range of 20-50 MPa, performing sheeting moulding on themixed material to obtain a metal sheet, putting the metal sheet in a vacuum electric arc melting furnace, in a condition with an argon protection atmosphere and electromagnetic stirring, performing electric arc melting till the temperature of the alloy solution is 1540-1560 DEG C, and performing water-cooling copper-formed mold casting to obtain an alloy A; and putting the alloy A in an argon atmosphere, performing thermal insulation at 1200-1250 DEG C for 0.5-1.5 h, performing oil hardening, putting the obtained product in an argon atmosphere, performing heating till the temperature reaches 550-650 DEG C, performing tempering treatment for 3-6 h, and cooling the furnace to the room temperature to obtain the Ni-Cr-Al-Fe-series high-temperature alloy. The prepared Ni-Cr-Al-Fe-series high-temperature alloy is high in tensile strength, elongation percentage and yield strength and can meet the application requirement of a gas turbine.

Description

technical field [0001] The invention relates to a method for preparing a Ni-Cr-Al-Fe high-temperature alloy, belonging to the technical field of high-temperature alloys. Background technique [0002] Superalloys are irreplaceable key materials for the hot end parts of military and civilian gas turbine engines. Ni-Cr-Al-Fe alloys have high strength, oxidation resistance, and excellent high-temperature corrosion resistance. Promising high-temperature structural materials. As the power of industrial gas turbines continues to increase, so does the demand for high-performance superalloy materials. Nowadays, the preparation methods of Ni-Cr-Al-Fe alloy are mainly casting method and powder metallurgy method. [0003] Among the preparation methods of Ni-Cr-Al-Fe alloy, melting casting method and powder metallurgy method are relatively common preparation methods. The traditional melting and casting method is to melt the raw material by vacuum induction melting or vacuum arc meltin...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C19/05C22F1/10
CPCC22C1/023C22C19/056C22F1/10
Inventor 蒋业华陈良郑椿冯晶
Owner KUNMING UNIV OF SCI & TECH
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