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High purity smelting method for nickel-based high-temperature alloy

A technology of nickel-based superalloy and smelting method, which is applied in the direction of improving energy efficiency and process efficiency, and can solve the problems of lowering refining temperature, shortening refining time, and poor desulfurization effect, so as to reduce refining temperature and shorten refining time , the effect of short refining time

Active Publication Date: 2014-04-30
NANJING UNIV OF SCI & TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-purity smelting method for nickel-based superalloys, which combines protective atmosphere induction melting and vacuum refining, aiming at the deficiencies of deoxidation and desulfurization in the existing smelting technology of superalloys and the serious burning loss of alloy elements causing composition deviation. Separately, and adopt high-frequency induction heating of water-cooled copper crucible to realize rapid heating and cooling, reduce refining temperature, shorten refining time, and effectively control the content of impurities such as oxygen, nitrogen, and sulfur

Method used

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  • High purity smelting method for nickel-based high-temperature alloy
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  • High purity smelting method for nickel-based high-temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The composition of this embodiment is shown in Table 1

[0032] Table 1

[0033]

[0034] The first step: melting of the alloy

[0035] (1) Furnace loading

[0036] In the water-cooled copper crucible from bottom to top, 40% Ni, all Co, all Re, all C, all Mo, all W, all Cr, all Ta, all Hf and 30% Ni were loaded in sequence.

[0037] (2) Alloy melting

[0038] Vacuum induction melting furnace is used for melting, when the vacuum degree of vacuum induction melting furnace reaches 1×10 -2 At P a, remove the attached gas by heating with low power; when the vacuum reaches 5×10 -3 At Pa, pass high-purity argon to 0.1MPa, rapidly heat up at a heating rate of 60°C / s until the charge is completely melted, and then cool down with the furnace.

[0039] Step 2: Alloy Refining

[0040] (1) Furnace loading

[0041] The alloy ingot melted in the first step, the Al-Y master alloy and the Ni-B master alloy are successively loaded into a water-cooled copper crucible.

[0042] ...

Embodiment 2

[0052] The composition of this embodiment is shown in Table 5

[0053] table 5

[0054]

[0055] The first step: melting of the alloy

[0056] (1) Furnace loading

[0057] In the water-cooled copper crucible from bottom to top, 50% Ni, all Co, all C, all Mo, all W, all Cr, all Ta, all Hf and 20% Ni were loaded in sequence.

[0058] (2) Alloy melting

[0059] Vacuum induction melting furnace is used for melting, when the vacuum degree of vacuum induction melting furnace reaches 1×10 -2 At P a, remove the attached gas by heating with low power; when the vacuum reaches 5×10 -3 At Pa, pass high-purity argon to 0.1MPa, rapidly heat up at a heating rate of 60°C / s until the charge is completely melted, and then cool down with the furnace.

[0060] Step 2: Alloy Refining

[0061] (1) Furnace loading

[0062] The first step alloy ingot, Al-Y master alloy, and Ni-B master alloy are successively loaded into a water-cooled copper crucible.

[0063] (2) Alloy refining

[0064] Re...

Embodiment 3

[0071] Adopt the alloy composition identical with embodiment 2

[0072] The first step: melting of the alloy

[0073] (1) Furnace loading

[0074] In the water-cooled copper crucible from bottom to top, 50% Ni, all Co, all C, all Mo, all W, all Cr, all Ta, all Hf and 20% Ni were loaded in sequence.

[0075] (2) Alloy melting

[0076] Vacuum induction melting furnace is used for melting, when the vacuum degree of vacuum induction melting furnace reaches 1×10 -2 Pa, remove the attached gas by heating with low power, when the vacuum reaches 5×10 -3 At Pa, pass high-purity argon to 0.1MPa, rapidly heat up at a heating rate of 60°C / s until the charge is completely melted, and then cool down with the furnace.

[0077] Step 2: Alloy Refining

[0078] (1) Furnace loading

[0079] The first step alloy ingot, Al-Y master alloy, and Ni-B master alloy are successively loaded into a water-cooled copper crucible.

[0080] (2) Alloy refining

[0081] Refined by high-frequency vacuum ...

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Abstract

The invention discloses a high purity smelting method for a nickel-based high-temperature alloy. The method mainly comprises the following steps: performing mother alloy smelting under high purity argon shield, performing mother alloy refining under high vacuum, and obtaining the nickel-based high temperature alloy with low impurity content. Because high-frequency induction heating is performed through water-cooling copper crucible equipment, and high-purity argon is introduced in the mother alloy smelting process, the alloy can be effectively prevented from being oxidized, impurity elements are prevented from entering, and burning loss of volatile elements is reduced. In addition, the equipment can realize rapid temperature rise and reduction, the high-impurity high-purity nickel-based high temperature alloy can be obtained in the process of mother alloy refining, and the method for smelting the nickel-based high temperature alloy is mainly applied to preparing a miniature sample of the nickel-based high temperature alloy.

Description

technical field [0001] The invention discloses a smelting method of a nickel-based superalloy, which uses water-cooled copper crucible equipment to carry out high-frequency induction melting under the condition of atmosphere protection; rapidly raises and lowers the temperature of the water-cooled copper crucible to carry out alloy refining under high vacuum, and then low-temperature alloys can be obtained. The invention relates to an impurity and high-purity nickel-based superalloy, belonging to the field of nickel-based superalloy preparation. Background technique [0002] Turbine blades are one of the parts with the worst working environment in aero-engines, and they are subjected to extremely complex stresses at high temperatures, so the requirements for their materials are extremely stringent. Whether it is casting equiaxed crystals, oriented columnar crystals, or single crystals, the quality and working performance of turbine blades mainly depend on the smelting qualit...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C19/05C22B9/04
CPCY02P10/25
Inventor 陈光周雪峰李沛祁志祥
Owner NANJING UNIV OF SCI & TECH
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