A method for purifying and melting nickel-based superalloy master alloy

A technology for nickel-based superalloy and master alloy, which is applied in the field of pure smelting of alloys and nickel-based superalloy master alloys, and can solve the problems of high cost and narrow application range.

Active Publication Date: 2020-11-03
METALINK SPECIAL ALLOYS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to propose a vacuum induction purification smelting technology for nickel-based superalloy master alloy in view of the shortcomings of the prior art, such as high cost and narrow application range

Method used

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  • A method for purifying and melting nickel-based superalloy master alloy

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Experimental program
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Effect test

Embodiment 1

[0017] The present embodiment prepares the second generation nickel-based single crystal superalloy René N5 according to the following steps:

[0018] Step 1, cloth and alloy melting:

[0019] The raw materials are processed to make the surface clean and metallic, and dried at 100°C for 20 hours. According to the composition of René N5 single crystal alloy, in the crucible according to the order of 30% Ni, 100% Co, 100% Cr, 100% Mo, 30% C, 100% Ta, 100% W, 30% Ni raw material order from bottom to top.

[0020] When the pressure rise rate is less than 0.13Pa / min and the vacuum degree is less than 1.3Pa, the electric melting starts. In the initial stage, a stepped power increase mode is adopted (frequency is 30-50kW / 10min until the rated power melts), and the remaining Ni and C are added during the melting process. After the primer is melted, heat until it melts. The whole melting process takes about 70-90min.

[0021] Step 2, a refining process:

[0022] After the bottom m...

Embodiment 2

[0030] The present embodiment prepares oriented nickel-based superalloy DZ125 according to the following steps:

[0031] Step 1, cloth and alloy melting:

[0032] The raw materials are processed to make the surface clean and metallic, and dried at 100°C for 20 hours. According to DZ125 oriented alloy composition, in the crucible according to 30% Ni, 100% Co, 100% Cr, 100% Mo, 35% C, 100% Ta, 100% W, 30% Ni raw material order from bottom to top.

[0033] When the pressure rise rate is less than 0.13pa / min and the vacuum degree is less than 2pa, the electric melting starts. In the initial stage, a stepped power increase mode is adopted (frequency is 30-50kW / 10min until the rated power melts), and the remaining Ni and C are added during the melting process. The whole melting process takes about 110-130min.

[0034] Step 2, a refining process:

[0035] After the bottom material is melted, the temperature is controlled at 1560±10°C, and the low-temperature refining stage is carri...

Embodiment 3

[0043] The present embodiment prepares equiaxed nickel-based superalloy IN718 according to the following steps:

[0044] Step 1, cloth and alloy melting:

[0045] The raw materials are processed to make the surface clean and metallic, and dried at 100°C for 17 hours. According to the IN718 alloy composition, the crucible is distributed in the order of 25% Ni, 100% Fe, 100% Cr, 100% Nb, 100% Mo, 40% C, and 40% Ni raw materials from bottom to top.

[0046] When the pressure rise rate is less than 0.13pa / min, and the vacuum degree is less than 4pa, the electric melting starts. In the initial stage, a stepped power increase mode is adopted (frequency is 30-50kW / 10min until the rated power melts), and the remaining Ni and C are added during the melting process. The whole melting process takes about 120-150min.

[0047] Step 2, a refining process:

[0048] After the bottom material is melted, the temperature is controlled at 1550±10°C, and the low-temperature refining stage is c...

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Abstract

The invention relates to a pure purification smelting method of an alloy, in particular to a pure purification smelting method for a nickel-based high-temperature alloy master alloy, and belongs to the technical field of metal smelting. According to the method, pure purification smelting of a master alloy is completed through material distributing and alloy melting, primary refining, alloying andsecondary refining, microalloying controlling and casting. The method has the advantages that the purity of vacuum melting can be effectively improved, the element segregation can be improved, and a nickel-based high-temperature alloy prepared by the method has the advantages that the purity is high, the segregation is low, the quality is remarkably higher than that of an alloy prepared through the existing technology and method, the quality of the nickel-based high-temperature alloy is improved, and the application field is expanded; nickel-based high-temperature alloys with different gradesand marks smelted by adopting the method has good effects; vacuum induction furnaces with the furnace types of 250 kg-grade and 1.5 ton-grade are adopted; and compared with an alloy before smelting and prepared through other technologies and methods, the alloy is remarkably improved in purity and uniformity.

Description

technical field [0001] The invention relates to a method for purifying and smelting alloys, in particular to a method for purifying and smelting nickel-based superalloy master alloys, and belongs to the technical field of metal smelting. Background technique [0002] Harmful impurity elements such as oxygen, nitrogen, and sulfur have extremely harmful and harmful effects on the mechanical properties, process properties, and high-temperature oxidation and corrosion resistance of metal materials, especially nickel-based superalloys. Therefore, how to reduce the content of harmful impurity elements in nickel-based superalloys has always been a key direction in the research and development of nickel-based superalloy melting technology. In nickel-based superalloys, the inclusion of oxides and nitrides formed by oxygen, nitrogen and other alloying elements will become the source of crack initiation and rapid propagation channels, seriously reducing the core mechanical properties s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C1/03C22C19/05
CPCC22C1/023C22C1/03C22C19/051
Inventor 马步洋李志刚金磊磊
Owner METALINK SPECIAL ALLOYS CORP
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