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Preparation method for obtaining kilogram-grade high temperature alloy undercooled melt

A technology for supercooled superalloys and supercooled melts, which is applied in the field of preparation of kilogram-level supercooled superalloys. The effect of good structure uniformity, good fluidity and low solid phase ratio

Active Publication Date: 2015-06-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to overcome the disadvantages existing in the prior art that when the mass of the melt increases to the kilogram level, the inconsistency between the melt surface and the internal supercooling degree, and the overall supercooled melt cannot be obtained, the present invention proposes a method for obtaining kilogram-level high temperature Preparation method of alloy supercooled melt

Method used

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  • Preparation method for obtaining kilogram-grade high temperature alloy undercooled melt
  • Preparation method for obtaining kilogram-grade high temperature alloy undercooled melt
  • Preparation method for obtaining kilogram-grade high temperature alloy undercooled melt

Examples

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Embodiment 1

[0039] This embodiment is a preparation method for obtaining a supercooled melt of a kilogram-level superalloy with a solid-liquid two-phase region of 30-80°C. The superalloy is K4169 superalloy, and the mass of the K4169 superalloy is 0.5Kg. The specific implementation is carried out in the intermediate frequency induction power supply, and its specific steps are:

[0040] Step one, the selection of induction power frequency. The conductor resistivity ρ and the conductor magnetic permeability μ are obtained according to the superalloy manual, and according to formula (1) and formula (2), the frequency of the intermediate frequency power supply is finally determined to be 30KHz.

[0041] ΔH=d / n, (1)

[0042] In the formula, n is a constant. According to the formula (1), the current penetration depth △H of the intermediate frequency induction power supply is determined.

[0043] f = ρ μ ( ...

Embodiment 2

[0057] The specific implementation process of this example is as follows: This example is a preparation method of a 2Kg Ni-22Cr-18W-1Mo superalloy supercooled melt.

[0058] The material involved in this example is a Ni-22Cr-18W-1Mo superalloy, which is a self-developed nickel-based deformed superalloy that is solid solution strengthened and carbide dispersion strengthened. The Ni-22Cr-18W-1Mo superalloy was disclosed in the paper "Secondary M23C6 Precipitation Behavior of Ni-22Cr-18W-1Mo-based Superalloy" by Bai Guanghai et al. in 2009.

[0059] Step one, the selection of induction power frequency. The conductor resistivity ρ and conductor magnetic permeability μ are obtained from the superalloy handbook, and according to formula (1) and formula (2), the frequency of the intermediate frequency power supply is finally determined to be 4KHz.

[0060] ΔH=d / n, (1)

[0061] In the formula, n is a constant. According to the formula (1), the current penetration depth △H of the in...

Embodiment 3

[0076] The specific implementation process of this example is: The specific implementation process of this example is: This embodiment is a preparation method of a 30Kg Ni-22Cr-18W-1Mo superalloy supercooled melt.

[0077] Step 1, the selection of induction power frequency. The conductor resistivity ρ and the conductor magnetic permeability μ are obtained from the superalloy handbook, and according to formula (1) and formula (2), the frequency of the intermediate frequency power supply is finally determined to be 400 Hz.

[0078] ΔH=d / n, (1)

[0079] In the formula, n is a constant. According to the formula (1), the current penetration depth △H of the intermediate frequency induction power supply is determined.

[0080] f = ρ μ ( 5030 ΔH ) 2 - - - ( ...

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Abstract

Disclosed is a preparation method for obtaining a kilogram-grade high temperature alloy undercooled melt. According to the preparation method, a medium-frequency induction power source is adopted as a heating power source, a convection current is generated through medium-frequency induction heating, and a macroscopic temperature field of the melt is more even so as to ensure that the melt is evenly cooled at the same time. A high-purity quartz crucible is used as a heating crucible, a B2O3 glass fusion covering agent is used as a cleaning agent or argon is inflated for protection, repeated circulated overheating treatment is adopted to conduct purification treatment on the melt, and the best purification effect is achieved by controlling the overheating temperature, the heat preservation temperature and the cycle index. The cooling rate is reasonably controlled, the temperature difference between the interior and the exterior of the melt is limited within 3 DEG C, and the whole melt is evenly cooled at the same time. The temperature field obtained by the preparation method and the structure of the melt are better in evenness, the whole kilogram-grade undercooled melt is in the undercooled state, the undercooled melt is better in flowability, and the solid fraction is lower than 0.2%. The preparation method is applicable to the field of micro-casting, and whole fine-grain ingot castings can be obtained by controlling the follow-up cooling speed of the kilogram-grade undercooled melt.

Description

technical field [0001] The invention relates to the field of supercooled solidification of superalloys, in particular to a preparation method for obtaining kilogram-level supercooled melts of superalloys. Background technique [0002] As an important means of grain refinement, melt treatment has been widely used in superalloys, and the acquisition of supercooled melt is the key process to ensure the successful solidification of fine grains. The thermal history of the melt before solidification and subsequent control The temperature method plays a vital role in obtaining fine-grained structure. By performing special temperature control on the melt, a better supercooled melt can be obtained. People have developed some methods of heat-controlled fine-grain casting of high-temperature alloys, and the methods that have been used in industry are mainly divided into: deep subcooling and ordinary heat-control methods. [0003] People such as Li Delin wrote "The Fine Grainization of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/00C21D1/42
CPCY02P10/25
Inventor 胡锐李金山高中堂张铁邦寇宏超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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