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Heat treatment process of nickel-based single crystal superalloy

A high-temperature alloy and nickel-based single crystal technology, which is applied in the directions of post-processing, single crystal growth, and single crystal growth, can solve the problems of lower initial melting temperature, lower alloy strength, and lower application value, and achieve an increase in initial melting temperature , excellent long-lasting performance, and the effect of improving application value

Inactive Publication Date: 2016-07-13
QINGDAO NPA IND
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Improper heat treatment process will reduce the strength of the alloy, reduce the initial melting temperature, and reduce the application value

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0012] The heat treatment process of the nickel-based single crystal superalloy of this embodiment includes the following steps:

[0013] (1) The master alloy is smelted in a vacuum induction furnace, and the master alloy cast rod is prepared by gravity casting;

[0014] (2) Using the seed crystal method to prepare a single crystal test rod through the Bridgeman directional solidification technology at a temperature gradient of 230K / cm and a pulling rate of 90 μm / s;

[0015] (3) The single crystal superalloy is subjected to solution treatment at 1335°C for 3 hours, followed by air cooling, followed by high temperature aging treatment at 1090°C for 4 hours, and then air cooled;

[0016] (4) Low-temperature aging treatment at 990°C for 20 hours, followed by air cooling.

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Abstract

The invention discloses a heat treatment process of a nickel-based single crystal superalloy. A differential thermal analysis method and a metallographic test method are adopted for determining an incipient melting temperature of the alloy to be about 1280 DEG C; an optical metalloscope is used for observation of a microstructure of an alloy after different solid solution treatments, and the endurance properties of the alloy are tested. Results show that an optimum heat treatment process of the alloy comprises 1245 DEG C / 2h, AC+1275 DEG C / 4h, AC+1100 DEG C / 2h, AC+850 DEG C / 24h, and AC. The single crystal superalloy treated by the process has excellent endurance properties, and the endurance life reaches 159.35 h under the conditions of the temperature of 980 DEG C and the pressure of 235 MPa.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a heat treatment process of a nickel-based single crystal superalloy. Background technique [0002] Superalloys have high high temperature strength, good oxidation resistance and hot corrosion resistance, excellent creep and fatigue resistance, good structural stability and reliability, and are widely used in aviation, aerospace, nuclear engineering and other equipment It is widely used in military fields such as power, and in civil fields such as energy, transportation, petrochemical and metallurgy. With the development of aero-engines, the performance requirements for high-temperature materials are also increasing. Improper heat treatment process will reduce the strength of the alloy, reduce the initial melting temperature, and reduce the application value. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B33/02C30B11/00C30B29/52
Inventor 常维宁
Owner QINGDAO NPA IND
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