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Vacuum Smelting Method of High Chromium Nickel Base Cast Superalloy

A high-temperature alloy and vacuum smelting technology, which is applied in the field of alloy smelting, can solve problems such as the influence of alloy mechanical properties, and achieve the effects of ensuring alloy performance, improving durability, and reducing precipitation

Active Publication Date: 2019-07-05
SHANDONG ROITIE NEW MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high chromium content will increase the body-centered cubic α-Cr phase of Cr in the alloy and the carbide of chromium (M 23 C 6 ,M 7 C 3 etc.) precipitation will have an important impact on the mechanical properties of the alloy

Method used

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  • Vacuum Smelting Method of High Chromium Nickel Base Cast Superalloy
  • Vacuum Smelting Method of High Chromium Nickel Base Cast Superalloy
  • Vacuum Smelting Method of High Chromium Nickel Base Cast Superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 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.

[0041] Taking the 200Kg vacuum furnace as an example, the vacuum smelting method of the present invention is as follows:

[0042] (1) The first step of carbon deoxidation:

[0043] First, add graphite, which accounts for 1 / 3 of the total carbon content of the superalloy, into the crucible of the vacuum furnace and place it at the bottom of the crucible, then add chromium and nickel into the crucible of the vacuum furnace, heat up to 1510±10°C for smelting for 25 minutes; then add All elements in superalloys except chromium, aluminum, titanium, and boron are smelted, the smelting temperature is 1570±10°C, and the smelting time is 25 minutes; graphite is TSC high-purity graphite spectral electrode, broken to 2-5mm particles;

[0044] (2) The second step c...

Embodiment 2

[0068] Taking the 200Kg vacuum furnace as an example, the vacuum smelting method of the present invention is as follows:

[0069] (1) The first step of carbon deoxidation:

[0070] First, add graphite, which accounts for 1 / 3 of the total carbon content of the superalloy, into the vacuum furnace crucible and place it at the bottom of the crucible, then add chromium and nickel into the vacuum furnace crucible, heat up to 1500±10°C for 30 minutes; then add All elements in superalloys except chromium, aluminum, titanium, and boron are smelted, the smelting temperature is 1560±10°C, and the smelting time is 30 minutes; graphite is TSC high-purity graphite spectral electrode, crushed to 2-5mm particles;

[0071] (2) The second step carbon deoxidation:

[0072] The temperature rises to 1570±10°C, add 1 / 3 of graphite into the crucible, and refine at 80kW for 10min;

[0073] (3) The third step carbon deoxidation:

[0074] The temperature rises to 1550±10°C, add the remaining graphit...

Embodiment 3

[0089] (1) The first step of carbon deoxidation:

[0090] First, add graphite, which accounts for 1 / 3 of the total carbon content of the superalloy, into the vacuum furnace crucible and place it at the bottom of the crucible, then add chromium and nickel into the vacuum furnace crucible, heat up to 1520±10°C for 20 minutes; then add All elements in superalloys except chromium, aluminum, titanium, and boron are smelted, the smelting temperature is 1580±10°C, and the smelting time is 20 minutes; graphite is TSC high-purity graphite spectroscopic electrode, broken to 2-5mm particles;

[0091] (2) The second step carbon deoxidation:

[0092] When the temperature rises to 1590±10°C, add 1 / 3 graphite into the crucible, and refine at 80kW for 10min;

[0093] (3) The third step carbon deoxidation:

[0094] The temperature rises to 1570±10°C, add the remaining graphite, and refine at 80kW for 10min;

[0095] (4) cooling and degassing:

[0096] Cool down, the temperature drops to 13...

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Abstract

The invention relates to an alloy smelting method, in particular to a vacuum smelting method for a high-chromium nickel base cast superalloy. The vacuum smelting method comprises the steps that graphite with the amount accounting for 1 / 3 the total carbonic mass of the superalloy is added into a vacuum furnace crucible and arranged on the bottommost of the crucible, then, chromium and nickel are added into the vacuum furnace crucible, the temperature is raised to 1,500-1,520 DEG C, smelting is carried out for 20-30 minutes; all elements, except the chromium, aluminum, titanium and boron, in thesuperalloy are added for smelting; the temperature is raised to 1,570 DEG C-1,590 DEG C, 1 / 3 graphite is added into the crucible, and refining is carried out; the temperature is raised to 1,550 DEG C-1,570 DEG C, and the remaining graphite is added for refining treatment; the temperature is reduced to 1,360 DEG C-1,380 DEG C; the aluminum and the titanium are added; a nickel-boron alloy is added;and molten metal is frozen, filtered and poured. By means of the vacuum smelting method, the endurance performance and the room temperature tensile performance of the high-chromium nickel base cast superalloy are improved, the molten metal is further purified, and therefore the high-quality high-chromium nickel base cast superalloy can be obtained

Description

technical field [0001] The invention relates to an alloy smelting method, in particular to a vacuum smelting method for a high-chromium-nickel-based cast 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/06C22C19/05
CPCC22C1/023C22C1/03C22C1/06C22C19/053
Inventor 李道乾李化坤殷凤仕苗本娟贾成建袁超班国良刘玉廷
Owner SHANDONG ROITIE NEW MATERIAL SCI & TECH