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Ni-Cr-based alloy and preparation method thereof

A base alloy, ni-cr technology, applied in the field of Ni-Cr base superalloy and its preparation, can solve problems such as unfavorable high temperature performance of Ni-Cr alloy, achieve improved thermal creep, uniform temperature distribution and remarkable effect Effect

Active Publication Date: 2019-08-02
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to propose a Ni-Cr base superalloy with high strength and high thermal creep performance and its The preparation method is to add V, Co, La, etc. to the Ni-Cr-based superalloy to suppress the nucleation conditions of discontinuous precipitates, and to cooperate with a certain heat treatment system and gradient strong magnetic field conditions to change the solute at the grain boundary. On the basis of enrichment and migration rules, change the nucleation and growth conditions of discontinuous precipitates, provide driving force for the competitive nucleation growth and control of DP / CP, and inhibit the effect of discontinuous precipitation in Ni-Cr-based superalloys, thereby Obtaining Ni-Cr-based superalloys with high strength and high thermal creep resistance

Method used

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  • Ni-Cr-based alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0043] A preferred embodiment of the present invention is:

[0044] (1) Master alloy preparation: use high-purity metals such as Ni, Cr, La, V, Co, etc. with a purity ≥ 99.9 wt%, and use a vacuum induction furnace or a vacuum consumable melting furnace or similar melting equipment to melt the metal. Apply 1.5-5Hz low-frequency electromagnetic stirring during the smelting process, and cast in copper molds or similar casting molds under the protection of 0.1-1 standard atmospheric pressure argon to prepare Ni-Cr-based alloy ingots.

[0045] (2) Hot rolling, cold rolling and solution treatment: the Ni-Cr base alloy obtained in step (1) is subjected to hot rolling treatment at 1150-1200°C, and then cold-rolled with a reduction of 67-75% in each pass , Solution treatment at 1100-1250°C for 1.5-2 hours.

[0046] (3) Strong magnetic field aging treatment: Place the sample obtained in step (2) in a strong magnetic field of 8-10T, adjust the position of the sample, and place it at -35...

Embodiment 1

[0048] (1) Master alloy preparation: Ni, Cr, La, V, Co high-purity metals with a purity ≥ 99.9 wt% are used to smelt the metals in a vacuum induction furnace. During the smelting process, 1.5Hz low-frequency electromagnetic stirring is applied, and the Ni-35%Cr-3%V-0.5%Co-0.5%La alloy ingot is prepared by casting in a copper mold under the protection of 0.1 standard atmospheric pressure argon.

[0049] (2) Hot rolling, cold rolling and solution treatment: the Ni-Cr base alloy obtained in step (1) is subjected to hot rolling treatment at 1150° C. solution treatment for 6 h.

[0050] (3) Strong magnetic field aging treatment: the sample obtained in step (2) is placed in a 0.1T strong magnetic field, and the position of the sample is adjusted. 2 / m gradient strong magnetic field, at a temperature of 700 ° C, quenching after holding for 0.5 hours to obtain a Ni-Cr-based alloy.

[0051] The tensile strength at 750°C of the prepared Ni-35%Cr-3%V-0.5%Co-0.5%La alloy is 850MPa, and ...

Embodiment 2

[0057] (1) Alloy ingot preparation: adopt Ni, Cr, La, V, Co high-purity metals with purity ≥ 99.9wt%, utilize vacuum induction furnace equipment to smelt the metal, and apply 3 Hz low-frequency electromagnetic stirring during the smelting process, at 0.5 Prepare Ni-40%Cr-0.1%V-0.1%Co-0.1%La alloy ingot by casting in a copper mold under the protection of standard atmospheric pressure argon;

[0058] (2) Hot rolling, cold rolling and solution treatment: the Ni-Cr base alloy obtained in step (1) is subjected to hot rolling treatment at 1180° C. solution treatment for 3 h.

[0059] (3) Strong magnetic field aging treatment: place the sample obtained in step (2) in a 23T strong magnetic field, adjust the position of the sample, and place it at -800T 2 / m gradient strong magnetic field, at a temperature of 600 ° C, quenching after 6 hours of heat preservation, to obtain a Ni-Cr-based alloy.

[0060] The tensile strength of the prepared Ni-40%Cr-0.1%V-0.1%Co-0.1%La alloy at 750°C i...

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Abstract

The invention provides a Ni-Cr-based alloy and a preparation method thereof. The Ni-Cr-based alloy comprises the following components of, in percentage by mass, 35%-45% of Cr, 0.1%-3% of V, 0.1%-0.5%of Co, 0.1%-0.5% of La, and the balance Ni. The alloy preparation method is matched with a certain heat treatment system and a gradient strong magnetic field condition, the nucleation growth conditions of discontinuous precipitation phases are changed on the basis of changing the enrichment and migration rules of solute at a grain boundary, a driving force is provided for the competition of the growth conditions and control of the nucleation between DP / CP, the discontinuous precipitation effect of the Ni-Cr-based high-temperature alloy is inhibited, so that the Ni-Cr-based high-temperature alloy with high strength and high thermal creep resistance is obtained.

Description

technical field [0001] The invention relates to a high-strength and high-temperature creep Ni-Cr base superalloy and a preparation method thereof, belonging to the technical field of alloy preparation. Background technique [0002] Because of its excellent high temperature strength, thermal creep resistance and oxidation resistance, Ni-Cr alloy is widely used in chemical, petrochemical, nuclear industry and other extreme environments and electric furnaces, household appliances, far-infrared devices, magnetron sputtering Coating and other equipment core components. It is found that discontinuous precipitates will be formed at the grain boundaries of Ni-Cr-based alloys with a chromium content of 35%-45% after low-temperature aging treatment, and continuous precipitates will be formed in the grains after high-temperature aging treatment. As the temperature decreases, the solubility of Cr in Ni decreases sharply to form Cr-based precipitates with different shapes including disc...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/02C22F1/10
CPCC22C1/023C22C19/058C22F1/002C22F1/10
Inventor 左小伟许铮豪唐家凯
Owner NORTHEASTERN UNIV
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