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A vacuum induction melting method for nickel-based superalloy

A vacuum induction smelting and nickel-based superalloy technology, which is applied in the field of vacuum induction smelting of nickel-based superalloys, can solve the problem that gas element nitrogen cannot be removed, achieve the effects of reducing nitrogen content, expanding application fields, and delaying the addition time

Active Publication Date: 2018-02-27
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nickel-based superalloys contain a large amount of nitride-forming elements, which leads to the fact that nitrogen, a gas element, cannot be effectively removed during the refining period during the smelting process. Therefore, how to remove nitrogen from the superalloy melt has always been a problem in vacuum induction melting of superalloys. important direction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of GH4169 Alloy

[0037] Step 1, alloy melting:

[0038] 1.1 Surface treatment is carried out on the alloy raw material, and it is dried at 100°C for 20 hours.

[0039] 1.2 According to the mass percentage of the target alloy composition raw materials: 20%-Ni, 100% Fe, 100% C, 100% MoFe, 50% Ni, arrange them in the crucible from bottom to top in order, and then place the crucible on The vacuum induction furnace is used for melting, and when the vacuum degree of the furnace chamber is less than 0.1Pa, the electric melting starts. During the melting process, the power is increased slowly and stepwise, with an increasing frequency of 3kW / min, until it reaches the rated melting power, so that the gas elements in the raw materials are gradually released, and the remaining Ni is added during the melting process. The melting rate is less than or equal to 1 / 4 of the maximum furnace capacity / h.

[0040] Step 2, initial refinement:

[0041] After all the materials...

Embodiment 2

[0047] Preparation of GH4698 alloy

[0048] Step 1, alloy melting:

[0049]1.1 Surface treatment is carried out on the alloy raw material, and it is dried at 100°C for 20 hours.

[0050] 1.2 According to the mass percentage of the target alloy composition raw materials: 30% Ni, 100% Fe, 100% C, 100% Mo, 50% Ni, arranged in the crucible from bottom to top in order, and then put the crucible in a vacuum The induction furnace is used for smelting, and when the vacuum degree of the furnace chamber is less than 0.1Pa, the electric smelting starts. During the melting process, the power is increased slowly and stepwise, with an increasing frequency of 3kW / min, until it reaches the rated melting power, so that the gas elements in the raw materials are gradually released, and the remaining Ni is added during the melting process. The melting rate is less than or equal to 1 / 4 of the maximum furnace capacity / h.

[0051] Step 2, initial refinement:

[0052] After all the materials in t...

Embodiment 3

[0058] Preparation of In718 alloy

[0059] Step 1, alloy melting:

[0060] 1.1 Surface treatment is carried out on the alloy raw material, and it is dried at 100°C for 20 hours.

[0061] 1.2 According to the mass percentage of the target alloy composition raw materials: 25% Ni, 100% Fe, 100% C, 100% MoFe, 40% Ni are arranged in the crucible from bottom to top in order, and then the crucible is placed in a vacuum The induction furnace is used for smelting, and when the vacuum degree of the furnace chamber is less than 0.1Pa, the electric smelting starts. During the melting process, the power is increased slowly and stepwise, with an increasing frequency of 3kW / min, until it reaches the rated melting power, so that the gas elements in the raw materials are gradually released, and the remaining Ni is added during the melting process. The melting rate is less than or equal to 1 / 4 of the maximum furnace capacity / h.

[0062] Step 2, initial refinement:

[0063] After all the mat...

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Abstract

The invention discloses a vacuum induction smelting method for nickel-based superalloy, comprising the steps of firstly, sequentially arranging raw materials from bottom to top in a crucible according to the order of Ni, Fe, C and Mo or Mo, Fe and Ni, melting and smelting; carrying out primary refining after completely melting the materials in a furnace and calming the surface of a melt; then, adding a strong nitride into the melt to form an element for secondary refining; and finally, adding a micro and easily-volatilized element, stirring until completely melting microalloy, and then, pouring to finish alloy smelting. The smelting method disclosed by the invention has an excellent denitrification effect; and compared with the existing method, the vacuum induction smelting method disclosed by the invention has the advantages that the nitrogen content of the nickel-based superalloy prepared by using the method is remarkably reduced, so that the application field of the nickel-based superalloy is greatly widened.

Description

technical field [0001] The invention belongs to the field of non-ferrous metals and relates to a vacuum induction melting method for a nickel-based superalloy. Background technique [0002] Vacuum induction melting, as the first melting process of nickel-based superalloys, has an important influence on the composition of alloy ingots. Nickel-based superalloys contain a large amount of nitride-forming elements, which leads to the fact that nitrogen, a gas element, cannot be effectively removed during the refining period during the smelting process. Therefore, how to remove nitrogen from the superalloy melt has always been a problem in vacuum induction melting of superalloys. important direction. In nickel-based superalloys, when the content of N element is high, nitride inclusions will be formed, and these nitride inclusions will form cracks and expand channels, which will have a crucial effect on the core mechanical properties of the alloy such as fatigue, durability and cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C1/06C22C19/03
CPCC22C1/023C22C1/06C22C19/03
Inventor 曹国鑫王玮东华正利罗文忠杜刚付宝全张丰收
Owner 西部超导材料科技股份有限公司
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