Smelting method of nickel-based high-temperature alloy

A technology of nickel-based superalloy and smelting method, applied in the field of alloy smelting, can solve the problems of difficulty in controlling the chemical composition of the alloy, affecting the comprehensive properties of the alloy, and excessively large amount of addition at one time, so as to improve the durability performance and room temperature tensile performance, guaranteeing Alloy properties, the effect of reducing segregation

Active Publication Date: 2016-06-08
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.
[0005] 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 segregation is easily generated, which will seriously affect the overall performance of the alloy.

Method used

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  • Smelting method of nickel-based high-temperature alloy
  • Smelting method of nickel-based high-temperature alloy
  • Smelting method of nickel-based high-temperature alloy

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Experimental program
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Effect test

Embodiment 1

[0035] According to the standard of K414 alloy, it is produced by the 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.

[0036] Taking the 200Kg vacuum furnace as an example, the smelting method of the present invention is as follows:

[0037] (1) The first step of carbon deoxidation:

[0038] 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;

[0039] (2) The second step carbon deoxidation:

[0040] When the temperature rises to 1580±10°C, add the remaining graphite into the crucible, refine at 80KW f...

Embodiment 2

[0054]According to the standard of K414 alloy, it is produced by the smelting method of the present invention, its chemical composition is shown in Table 3, and its performance parameters are shown in Table 4.

[0055] Taking the 200Kg vacuum furnace as an example, the smelting method of the present invention is as follows:

[0056] (1) The first step of carbon deoxidation:

[0057] 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 1590±10°C, and smelting time is 20 minutes;

[0058] (2) The second step carbon deoxidation:

[0059] When the temperature rises to 1590±10°C, add the remaining graphite into the crucible, refine at 80KW for 20m...

Embodiment 3

[0073] According to the standard of K414 alloy, it is produced by the smelting method of the present invention, its chemical composition is shown in Table 5, and its performance parameters are shown in Table 6.

[0074] Taking the 200Kg vacuum furnace as an example, the smelting method of the present invention is as follows:

[0075] (1) The first step of carbon deoxidation:

[0076] 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 1580±10°C, and smelting time is 30 minutes;

[0077] (2) The second step carbon deoxidation:

[0078] When the temperature rises to 1570±10°C, add the remaining graphite into the crucible, refine at 80KW for 30...

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Abstract

The invention relates to alloy smelting methods, in particular to a smelting method of nickel-based high-temperature alloy. The smelting method includes following steps: adding graphite accounting for 50% of total carbon content of the high-temperature alloy into a vacuum furnace crucible, placing at the downmost bottom of the crucible, and adding all elements, except for aluminum, titanium, boron and nickel, in the high-temperature alloy into the vacuum furnace crucible for smelting; heating, adding remaining graphite into the crucible, refining, and then cooling; adding metal calcium, and heating for refining after the metal calcium is smelted completely; cooling, adding aluminum and titanium, and heating until aluminum and titanium are smelted fully; adding nickel-boron alloy, and heating the nickel-boron alloy is smelted; cooling, freezing metal melt, heating, and tapping for pouring. By using the smelting method, content of harmful gas and low-smelting-point harmful impurities in the high-temperature alloy is lowered, pure alloy melt is obtained, alloy element segregation is reduced, and alloy performance is guaranteed.

Description

technical field [0001] The invention relates to an alloy smelting method, in particular to a nickel-based superalloy smelting method. 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, such as (Al 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C1/03C22C1/06
CPCC22C1/03C22C1/06C22C19/056
Inventor 马中钢郭建亭李道乾王光华李娜
Owner SHANDONG ROITIE NEW MATERIAL SCI & TECH
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