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Nickel-base high-temperature alloy GH4720Li smelting technique

A nickel-based superalloy and superalloy technology, applied in the field of superalloy smelting, can solve the problems of large fluctuation of low melting point elements and high content of impurity elements in superalloys, and achieve the effects of high composition control accuracy, reduced impurity element content and low cost.

Active Publication Date: 2017-05-10
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a smelting process of nickel-based superalloy GH4720Li, which solves the problems of high content of impurity elements and large fluctuations of low-melting point elements such as Al and Ti in the existing method of smelting GH4720Li superalloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Vacuum induction melting (VIM):

[0045] First put 70wt% Ni, metal Co, NiMo alloy, NiW alloy and 30wt% Ni into the furnace in sequence, wait until the vacuum degree is ≤0.1Pa, slowly increase the power to 300kw to start melting the raw materials, slowly increase the power to 450kw until the raw materials are melted , the measured temperature at this time is 1520 ° C, enter the refining period to adjust the melt temperature to 1500 ° C, the refining time is 30 minutes, and apply electromagnetic stirring during the refining process; add vacuum degassing Cr after reducing the power to melt surface conjunctiva, and increase the power to Melting, the measured temperature at this time is 1530 ° C, enter the refining period to adjust the melt temperature to 1500 ° C, the refining time is 20 minutes, and apply electromagnetic stirring during the refining process; add Al beans and sponge Ti after the melt surface is conjunctivated after the power is reduced, Increase the pow...

example 2

[0062] (1) Vacuum induction melting (VIM):

[0063] First put 75wt% Ni, metal Co, NiMo alloy, NiW alloy and 25wt% Ni into the furnace in sequence, wait until the vacuum degree is ≤0.1Pa, slowly increase the power to 300kw to start melting the raw materials, slowly increase the power to 500kw until the raw materials are melted , the measured temperature at this time is 1530 ° C, enter the refining period to adjust the melt temperature to 1500 ° C, the refining time is 30 minutes, and apply electromagnetic stirring during the refining process; add vacuum degassing Cr after reducing the power to melt surface conjunctiva, and increase the power to Melting, the measured temperature at this time is 1520 ° C, enter the refining period to adjust the melt temperature to 1490 ° C, the refining time is 20 minutes, and apply electromagnetic stirring during the refining process; add Al beans and sponge Ti after the melt surface is conjunctivated after the power is reduced, Increase the pow...

Embodiment 3

[0079] (1) Vacuum induction melting (VIM):

[0080] First put 80wt% Ni, metal Co, NiMo alloy, NiW alloy and 20wt% Ni into the furnace in sequence, wait until the vacuum degree is ≤0.1Pa, slowly increase the power to 300kw to start melting the raw materials, slowly increase the power to 550kw until the raw materials are melted , the measured temperature at this time is 1540 ° C, enter the refining period to adjust the melt temperature to 1500 ° C, the refining time is 40 minutes, and apply electromagnetic stirring during the refining process; add vacuum degassing Cr after reducing the power to the surface of the melt, and increase the power to Melting, the measured temperature at this time is 1550°C, enter the refining period to adjust the melt temperature to 1500°C, the refining time is 20min, apply electromagnetic stirring during the refining process; add Al and Ti after the melt surface is formed after the power is reduced, and the power is increased Until the melting is cle...

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Abstract

The invention discloses a nickel-base high-temperature alloy GH4720Li smelting technique. The technique comprises the following step: carrying out smelting by a triple (VIM+VAR+VAR) smelting technique according to the composition requirements for the GH4720Li alloy (No.1 or No.2 Ni, vacuum-degassed Cr, sponge Ti, Al beans, metal Co, NiW alloy, NiMo alloy, carbon, NiMg alloy, NiB alloy and zirconium sponge), thereby obtaining the GH4720Li high-temperature alloy cast ingot. The novel triple smelting technique enhances the metallurgical quality of the GH4720Li alloy; especially the gamma' phase forming elements Al and Ti for performing the main reinforcement function in the GH4720Li alloy have high composition control precision and favorable uniformity; and the other alloy elements have the advantages of less segregation and high composition control precision. The obtained alloy has impurity element content, and the properties have long-term stability at 650-750 DEG C.

Description

technical field [0001] The invention belongs to the technical field of superalloy smelting, and in particular relates to a smelting process of a nickel-based superalloy GH4720Li. Background technique [0002] Superalloys are widely used in hot end parts of aero-engines and industrial gas turbines due to their good high-temperature strength, fatigue resistance, oxidation resistance, and corrosion resistance, as well as good structural stability in high-temperature environments. Alloying can significantly improve the high-temperature service strength of superalloys, so there are more than a dozen or even twenty kinds of constituent elements in superalloys, which often cause segregation of alloying elements and an increase in the content of impurity elements during the smelting process of superalloys. These will deteriorate the performance of superalloys. GH4720Li is a nickel-based age-strengthened superalloy, in which the content of Al and Ti is as high as 7.5%. Through γ' st...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C19/05
CPCC22C1/023C22C1/03C22C19/056
Inventor 付宝全薛建飞王玮东曹国鑫杜刚李会武刘向宏冯勇张平祥
Owner 西部超导材料科技股份有限公司
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