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K418 mother alloy vacuum induction melting element control method

A technology of vacuum induction melting and control method, which is applied in the field of superalloy smelting, which can solve the problems of high burning loss, difficulty, and reduced mechanical properties, and achieve the effects of wide application range, improved purity, and simple operation

Inactive Publication Date: 2020-10-09
广东华鳌合金新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the alloy, Al, Ti and Nb elements are the main constituent elements of the γ' phase that can be precipitated and strengthened. The sum of Al, Ti and Nb elements is as high as 7.8-9.9wt%, and the sum of Al and Ti elements is as high as about 7%. Al and Ti elements, as active elements, are easy to burn out during the vacuum induction melting process, which makes element control difficult. If the Al and Ti elements are not properly controlled, the mechanical properties of the alloy will be unstable, and even the mechanical properties will not meet the standard requirements.
The content of B and Zr elements in this alloy is relatively small, but they are indispensable as grain boundary strengthening elements. If these trace elements are not properly controlled during the vacuum melting process, they will be burned more, resulting in relatively weak grain boundaries of the K418 alloy, resulting in poor mechanical properties. reduce

Method used

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  • K418 mother alloy vacuum induction melting element control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Vacuum induction melting of K418 master alloy.

[0020] Step 1, raw material baking

[0021] Carbon, metal nickel, metal chromium, metal molybdenum, metal aluminum, metal titanium, metal niobium, nickel-boron alloy and metal zirconium raw materials are baked at 100°C for 3 hours.

[0022] Step 2, according to the order of feeding and smelting

[0023] 2.1 Add Ni, C, Mo and Cr raw materials, and when the smelting chamber is evacuated to no more than 20Pa, the power is stepped up until the molten metal is melted.

[0024] 2.2 Entering the refining period, when the pressure in the smelting chamber is not greater than 5Pa, adjust the temperature of the molten metal to 1530°C, and then adjust the power to the heat preservation power for 40 minutes of refining time. After the refining is completed, the pressure in the smelting chamber is not greater than 5Pa.

[0025] 2.3 Add Al, Ti and Nb raw materials, adjust the temperature of the molten metal to 1400°C, and the pressure...

Embodiment 2

[0030] Vacuum induction melting of K418 master alloy.

[0031] Step 1, raw material baking

[0032] Carbon, metal nickel, metal chromium, metal molybdenum, metal aluminum, metal titanium, metal niobium, nickel-boron alloy and metal zirconium raw materials are baked at 150°C for 3 hours.

[0033] Step 2, according to the order of feeding and smelting

[0034] 2.1 Add Ni, C, Mo and Cr raw materials, and when the smelting chamber is evacuated to no more than 20Pa, the power is stepped up until the molten metal is melted.

[0035] 2.2 Entering the refining period, when the pressure in the smelting chamber is not greater than 5Pa, adjust the temperature of the molten metal to 1540°C, and then adjust the power to the heat preservation power for 60 minutes of refining time. After the refining is completed, the pressure in the smelting chamber is not greater than 5Pa.

[0036] 2.3 Add Al, Ti and Nb raw materials, adjust the temperature of the molten metal to 1450°C, and the pressure...

Embodiment 3

[0041] Vacuum induction melting of K418 master alloy.

[0042] Step 1, raw material baking

[0043] Carbon, metal nickel, metal chromium, metal molybdenum, metal aluminum, metal titanium, metal niobium, nickel-boron alloy and metal zirconium raw materials are baked at 150°C for 3 hours.

[0044] Step 2, according to the order of feeding and smelting

[0045] 2.1 Add Ni, C, Mo and Cr raw materials, and when the smelting chamber is evacuated to no more than 20Pa, the power is stepped up until the molten metal is melted.

[0046] 2.2 Entering the refining period, when the pressure in the smelting chamber is not greater than 5Pa, adjust the temperature of the molten metal to 1550°C, and then adjust the power to the heat preservation power for 80 minutes of refining time. After the refining is completed, the pressure in the smelting chamber is not greater than 5Pa.

[0047] 2.3 Add Al, Ti and Nb raw materials, adjust the temperature of the molten metal to 1480°C, and the pressure...

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Abstract

The invention discloses a K418 mother alloy vacuum induction melting element control method. The method specifically includes the steps of baking and dehumidifying K418 mother alloy raw materials, sequentially performing melting and melting down on the raw materials respectively under a certain molten metal temperature and a certain furnace chamber internal pressure according to an adding sequenceof the raw materials, performing power-off skinning operation on the molten metal before sampling, adjusting of chemical components and pouring to prevent elements from burning loss, adding additivesto the molten metal after adjusting temperature and pressure to a certain temperature and a certain melting chamber pressure, and adjusting a temperature of the molten metal to a pouring temperatureto complete pouring of the molten metal. The method provides a new process for element control of K418 alloy in the melting process, can effectively control elements that are prone to burning loss inK418 alloy, and is easy to operate, high in feasibility and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy smelting, and in particular relates to a method for controlling elements in vacuum induction smelting of a K418 master alloy. Background technique [0002] K418 master alloy is a nickel-based precipitation-strengthened casting superalloy, which is mainly used to make turbine working blades, guide vanes and integrally cast turbines for aviation, ground and offshore gas turbines, as well as supercharged turbines for diesel and gasoline engines. In the alloy, Al, Ti and Nb elements are the main constituent elements of the γ' phase that can be precipitated and strengthened. The sum of Al, Ti and Nb elements is as high as 7.8-9.9wt%, and the sum of Al and Ti elements is as high as about 7%. Al and Ti elements, as active elements, are easy to burn out during the vacuum induction melting process, which makes element control difficult. If the Al and Ti elements are not properly controlled, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C19/05C22B9/04
CPCC22B9/04C22C1/023C22C1/03C22C19/056Y02P10/25
Inventor 徐国民薛建飞全会峰王玮郭文香
Owner 广东华鳌合金新材料有限公司
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