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Vacuum melting method of nickel-based high-temperature alloy

A nickel-based high-temperature alloy, vacuum smelting technology, applied in the field of alloy smelting, can solve the problems of difficult control of alloy chemical composition, influence on the overall performance of the alloy, and excessive one-time addition, so as to improve the durability and tensile properties at room temperature, and ensure Alloy performance, effect of reducing segregation

Active Publication Date: 2016-05-25
SHANDONG ROITIE NEW MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the temperature of the molten metal is suitable when aluminum and titanium are added, the chemical composition of the alloy is difficult to control due to burning loss and vacuum volatilization due to excessive addition at one time.
In addition, because aluminum, titanium, and boron are relatively light and have low density, after being added to the molten metal, they float on the surface of the molten metal and are prone to segregation, which will seriously affect the overall performance of the alloy.

Method used

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  • Vacuum melting method of nickel-based high-temperature alloy
  • Vacuum melting method of nickel-based high-temperature alloy
  • Vacuum melting method of nickel-based high-temperature alloy

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Experimental program
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Embodiment 1

[0030] According to the standard of K4648 alloy, it is produced by the vacuum smelting method of the present invention, its chemical composition is as shown in Table 1, and its performance parameters are as shown in Table 2.

[0031] Taking the 200Kg vacuum furnace as an example, the vacuum smelting method of the present invention is as follows:

[0032] (1) The first step of carbon deoxidation:

[0033] Graphite, which accounts for 50% of the total carbon content of the superalloy, is added to the vacuum furnace crucible, placed at the bottom of the crucible, and all elements in the superalloy except aluminum, titanium, boron, and nickel are added to the vacuum furnace crucible for smelting ; Graphite is particles crushed to 2-5mm by spectral graphite electrodes; smelting temperature is 1570±10°C, and smelting time is 25 minutes;

[0034] (2) The second step carbon deoxidation:

[0035] When the temperature rises to 1580±10°C, add the remaining graphite into the crucible, r...

Embodiment 2

[0050] According to the standard of K4648 alloy, it is produced by the vacuum smelting method of the present invention, its chemical composition is shown in Table 3, and its performance parameters are shown in Table 4.

[0051] Taking the 200Kg vacuum furnace as an example, the vacuum smelting method of the present invention is as follows:

[0052] (1) The first step of carbon deoxidation:

[0053] Graphite, which accounts for 50% of the total carbon content of the superalloy, is added to the vacuum furnace crucible, placed at the bottom of the crucible, and all elements in the superalloy except aluminum, titanium, boron, and nickel are added to the vacuum furnace crucible for smelting ; Graphite is particles crushed to 2-5 mm by spectrum graphite electrodes; smelting temperature is 1580±10°C, and smelting time is 20 minutes;

[0054] (2) The second step carbon deoxidation:

[0055] When the temperature rises to 1590±10°C, add the remaining graphite into the crucible, refine...

Embodiment 3

[0069] According to the standard of K4648 alloy, it is produced by the vacuum smelting method of the present invention, its chemical composition is shown in Table 5, and its performance parameters are shown in Table 6.

[0070] Taking the 200Kg vacuum furnace as an example, the vacuum smelting method of the present invention is as follows:

[0071] (1) The first step of carbon deoxidation:

[0072] Graphite, which accounts for 50% of the total carbon content of the superalloy, is added to the vacuum furnace crucible, placed at the bottom of the crucible, and all elements in the superalloy except aluminum, titanium, boron, and nickel are added to the vacuum furnace crucible for smelting ; Graphite is particles crushed to 2-5 mm by spectral graphite electrodes; smelting temperature is 1560±10°C, and smelting time is 30 minutes;

[0073] (2) The second step carbon deoxidation:

[0074] When the temperature rises to 1570±10°C, add the remaining graphite into the crucible, refine...

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Abstract

The invention relates to an alloy melting method, and particularly relates to a vacuum melting method of a nickel-based high-temperature alloy. The method comprises the following steps: adding graphite which is 50 percent of the total carbon mass of the high-temperature alloy to the bottom of the crucible of a vacuum furnace, adding all elements in the high-temperature alloy, except aluminum, titanium, boron and nickel, into the crucible of the vacuum furnace for melting; adding the rest graphite into the crucible while heating, refining, and cooling; adding aluminum and titanium, and heating until aluminum and titanium are completely molten; insulating at 1410-1430 DEG C, adding nickel-boron alloy, and heating until the nickel-boron alloy is molten to obtain a molten metal; and cooling, freezing the molten metal, heating, tapping and pouring while filtering. According to the method, the durability and room-temperature tensile performance of the high-temperature alloy can be improved, and the molten metal can be further purified, so that high-quality nickel-based high-temperature alloy can be obtained.

Description

technical field [0001] The invention relates to an alloy smelting method, in particular to a vacuum smelting method for a nickel-based superalloy. Background technique [0002] The technical difficulty in vacuum smelting of aerospace and civil superalloys lies in the strict control of the gas content (oxygen, nitrogen, hydrogen) in the alloy. At present, according to enterprise standards, the oxygen and nitrogen content in many alloys is generally around 20ppm. Only by reducing the content of harmful impurities in the alloy, reducing the segregation of alloy elements, and improving the purity of the alloy melt can the service performance and life of the alloy be improved. However, the vacuum smelting process is a very complex thermal processing process, and the design of any process step will have an important impact on the gas content, impurity content and properties of the alloy. [0003] O, N, and S in the alloy will form non-metallic inclusions in the alloy solution, su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C19/05
CPCC22C1/023C22C1/03C22C1/06C22C19/053
Inventor 马中钢李道乾刘玉庭刘云王光华
Owner SHANDONG ROITIE NEW MATERIAL SCI & TECH