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Method for improving purity of nickel-based superalloy

A nickel-based high-temperature alloy, purity technology, applied in the field of alloy smelting, can solve the problems of increasing oxide inclusion content, affecting purity, cumbersome process, etc., to achieve the effect of improving comprehensive performance and improving purity

Inactive Publication Date: 2014-04-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dual process itself has the disadvantages of low production efficiency, cumbersome process, and impurity pollution introduced by process conversion, and in the single smelting process, there is the problem of introducing other impurities during the vacuum induction melting process, mainly the reaction between refractory materials and melt It will also increase the content of oxide inclusions and affect its purity. In addition, there are problems such as the inability to remove sulfur and phosphorus in the arc remelting process, the size of the inclusions is large, there are dendritic and white point defects, and the surface quality of the ingot is poor.
At the same time, in the traditional preparation process, the vacuum environment in the melting process is not enough to volatilize and remove impurity atoms from the alloy melt, which also makes it difficult to improve the purity of the alloy

Method used

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  • Method for improving purity of nickel-based superalloy
  • Method for improving purity of nickel-based superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Pretreatment of nickel-based superalloys

[0023] 1. Select a commercially available nickel-based superalloy Inconel 718 alloy block material, and cut it into a circular nickel-based alloy block with a size of Φ100mm×8mm by wire electric discharge cutting.

[0024] 2. First, take a small part of the raw material for component testing;

[0025] 3. Use sandpaper to polish the surface of the nickel-based alloy block to remove the oxide layer and impurity-enriched areas on the surface to ensure the purity of the alloy before smelting. When the surface of the sample is polished until it is clean and bright, the sequence of using sandpaper is: 200#, 600#, 1000#, 1500#. Then place it in deionized water to wash and dry, the drying time is 5 hours, and the drying temperature is 50 degrees.

[0026] 2. Electron beam remelting technology removes impurity element atoms

[0027] 1. Place the round piece of nickel-based alloy stably in the water-cooled copper crucible of the el...

Embodiment 2

[0033] 1. Pretreatment of nickel-based superalloys

[0034] 1. Select a commercially available nickel-based superalloy Inconel 718 alloy block material, and cut it into a circular nickel-based alloy block with a size of Φ100mm×8mm by wire electric discharge cutting.

[0035] 2. First, take a small part of the raw material for component testing;

[0036] 3. Use sandpaper to polish the surface of the nickel-based alloy block to remove the oxide layer and impurity-enriched areas on the surface to ensure the purity of the alloy before smelting. When the surface of the sample is polished until it is clean and bright, the sequence of using sandpaper is: 200#, 600#, 1000#, 1500#. Then wash and dry in deionized water, the drying time is 4 hours, and the drying temperature is 65 degrees.

[0037] 2. Electron beam remelting technology removes impurity element atoms

[0038] 1. Place the round piece of nickel-based alloy stably in the water-cooled copper crucible of the electron beam ...

Embodiment 3

[0044] 1. Pretreatment of nickel-based superalloys

[0045] 1. Select a commercially available nickel-based superalloy Inconel 718 alloy block material, and cut it into a circular nickel-based alloy block with a size of Φ100mm×8mm by wire electric discharge cutting.

[0046] 2. First, take a small part of the raw material for component testing;

[0047] 3. Use sandpaper to polish the surface of the nickel-based alloy block to remove the oxide layer and impurity-enriched areas on the surface to ensure the purity of the alloy before smelting. When the surface of the sample is polished until it is clean and bright, the sequence of using sandpaper is: 200#, 600#, 1000#, 1500#. Then place it in deionized water to wash and dry, the drying time is 3 hours, and the drying temperature is 80 degrees.

[0048] 2. Electron beam remelting technology removes impurity element atoms

[0049] 1. Place the round piece of nickel-based alloy stably in the water-cooled copper crucible of the el...

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Abstract

The invention relates to a method for improving the purity of nickel-based superalloy, which belongs to the field of alloy smelting. The method for improving the purity of nickel-based superalloy comprises the following process steps: increasing a beam to 200 mA at a speed of 1 mA / s under a vacuum degree of less than 0.05 Pa in the furnace body of an electron beam smelting device and a vacuum degree of less than 0.005 Pa of an electron gun body, and bombarding the beam onto a nickel-based superalloy substrate until the alloy is completely smelted; after the nickel-based superalloy substrate is completely smelted, continuing to increase the electron gun beam to 400 mA at a speed of 2 mA / s, adjusting the beam spot radius of the electron beam to 15*15, smelting the alloy for 5 minutes, and then cooling. According to the method, O, N and S in the alloy as well as harmful impurity elements such as As, Sb, Si, Pb and Bi can be greatly reduced, thus improving the purity of the alloy in the aspect of reducing the contents of the harmful elements, and then improving the comprehensive performance of the nickel-based superalloy.

Description

technical field [0001] The invention relates to a method for improving the purity of a nickel-based superalloy, belonging to the field of alloy smelting. Background technique [0002] Nickel-based superalloys are an important class of indispensable materials for various high-temperature parts of aero-engines, aerospace rocket engines and industrial gas turbines. Because of its good high temperature strength and oxidation corrosion resistance, excellent creep resistance, fatigue resistance and fracture toughness, and the degree of alloying of superalloys is very high, superalloys are also called superalloys in European and American countries ( Superalloy). Superalloys are widely used in various industrial fields such as aviation, aerospace, energy, transportation, chemical industry, etc., especially for the production of aero-engines and industrial gas turbines: such as the four major components of impeller blades, guide vanes, impeller discs and combustion chambers. The co...

Claims

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Application Information

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IPC IPC(8): C22B9/22C22B23/06C22C1/02C22C19/03
Inventor 谭毅廖娇李佳艳游小刚石爽秦世强
Owner DALIAN UNIV OF TECH
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