Heat treatment method of nickel-based single crystal superalloy

A heat treatment method and technology of superalloy, applied in the direction of post-treatment, single crystal growth, single crystal growth, etc., can solve the problem of no specific solution, depletion of Cr on the surface layer of nickel-based alloy, etc., and achieve excellent high temperature strength and Antioxidative properties, eliminate element segregation and eutectic structure, improve the effect of comprehensive performance

Inactive Publication Date: 2021-06-22
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it can't solve the problem of Cr depletion on the surface layer of nickel-based alloy under vacuum addition
[0003] In the field of nickel-based alloy technology, especially in the heat treatment process of nickel-based alloys, there are still many practical problems that need to be dealt with in practical applications, and no specific solutions have been proposed.

Method used

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  • Heat treatment method of nickel-based single crystal superalloy
  • Heat treatment method of nickel-based single crystal superalloy
  • Heat treatment method of nickel-based single crystal superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Vacuum induction furnace is used to smelt nickel-based single crystal superalloy, and the alloy cast rod is prepared by gravity casting;

[0037] (2) Using the seed crystal method to prepare a Cr-containing nickel-based single crystal superalloy at a temperature gradient of 150K / cm and a pulling rate of 50 μm / s through Bridgeman directional solidification technology; in this embodiment, select the Cr-containing superalloy The diameter of the nickel-based single crystal superalloy is 10 mm, and the length of the Cr-containing nickel-based single crystal superalloy is 5 mm;

[0038] (3) Determine the initial melting temperature T of the nickel-based single crystal superalloy containing Cr, and determine the heating rate V of the nickel-based single crystal superalloy containing Cr in the solution treatment process; The heating rate of the alloy during the solution treatment process is obtained by Dictra software to obtain the initial distribution of the mass fraction ...

Embodiment 2

[0045] (1) Vacuum induction furnace is used to smelt nickel-based single crystal superalloy, and the alloy cast rod is prepared by gravity casting;

[0046] (2) Using the seed crystal method to prepare a Cr-containing nickel-based single crystal superalloy at a temperature gradient of 250K / cm and a pulling rate of 100 μm / s through Bridgeman directional solidification technology; in this embodiment, select the Cr-containing superalloy The diameter of the nickel-based single crystal superalloy is 10 mm, and the length of the Cr-containing nickel-based single crystal superalloy is 5 mm;

[0047](3) determine the initial melting temperature T of the nickel-based single crystal superalloy containing Cr; the heating rate of the nickel-based single crystal superalloy containing Cr in the solution treatment process is obtained by Dictra software. The mass fraction of each element in the dendrite structure is obtained from the initial distribution of the dendrite stem to the dendrite, ...

Embodiment 3

[0054] (1) Vacuum induction furnace is used to smelt nickel-based single crystal superalloy, and the alloy cast rod is prepared by gravity casting;

[0055] (2) adopting the seed crystal method to prepare the nickel-based single crystal superalloy containing Cr in the temperature gradient of 200K / cm and the drawing rate of 50-100 μm / s by Bridgeman directional solidification technology; The diameter of the Cr-containing nickel-based single-crystal superalloy is 10 mm, and the length of the Cr-containing nickel-based single-crystal superalloy is 5 mm;

[0056] (3) Determine the initial melting temperature T of the nickel-based single crystal superalloy containing Cr, and determine the heating rate V of the nickel-based single crystal superalloy containing Cr in the solution treatment process; The heating rate of the alloy in the solution treatment process is obtained by Dictra software to obtain the initial distribution of the mass fraction of each element in the dendrite struct...

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Abstract

The invention provides a heat treatment process of a nickel-based single crystal superalloy. After solution treatment, high-temperature aging treatment and low-temperature aging treatment are conducted in the vacuum inert atmosphere environment, diffusion and evaporation of Cr in the nickel-based single crystal superalloy are prevented, the surface of the nickel-based single crystal superalloy is not obviously oxidized, the depth of a Cr-poor layer is controlled to be 50 micrometers or below, and therefore requirements specified by blade technical standards are met; the dissolution of a gamma' phase with a coarse structure can be effectively promoted, element segregation and eutectic structures in a Cr-containing nickel-based single crystal superalloy structure are remarkably eliminated, the uniformity of the alloy is improved, and the influence of grain boundary strengthening elements on the nickel-based single crystal alloy is eliminated; and in addition, the nickel-based single crystal superalloy obtained through the heat treatment method has excellent high-temperature strength and oxidation resistance, the surface mechanical performance of the nickel-based single crystal superalloy is improved on the premise that creep resistance is not sacrificed, and the service life of the nickel-based single crystal superalloy is prolonged.

Description

technical field [0001] The invention relates to the field of metal treatment technology, in particular to a heat treatment method for a nickel-based single crystal superalloy. Background technique [0002] Nickel-based single crystal superalloys belong to non-equilibrium solidification during the casting process, and there is a difference between the solid phase concentration and the liquid phase concentration during solidification. Elements) and post-solidification dendrites (enriched in Al, Ta and other γ′ phase-forming elements) have composition segregation. In nickel-based single crystal superalloys, there is a certain amount of chromium element, which can make the alloy have good high temperature oxidation resistance and corrosion resistance, and improve its fatigue life at high temperature. However, during the vacuum heat treatment of single crystal blade castings, Cr depletion of the surface layer often occurs, that is, the Cr content of the surface layer of the blad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22F1/02C30B11/00C30B29/52C30B33/02
CPCC22F1/02C22F1/10C30B11/00C30B29/52C30B33/02
Inventor 戚海英陈东初
Owner FOSHAN UNIVERSITY
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