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Purified smelting process of a nickel-based superalloy rich in active elements

A technology of nickel-based superalloy and active elements, which is applied in the field of metal smelting and casting, can solve the problems of unfavorable casting quality control, unclear influence, sand sticking, etc., achieve low gas and impurity element content, uniform composition, and improve purity Effect

Active Publication Date: 2021-05-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the influence of rare earth elements on the mechanical properties of the alloy is not yet clear, and when the content of rare earth elements is high (usually above 0.2%), sand sticking is prone to occur during casting, which is not conducive to the quality control of castings

Method used

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  • Purified smelting process of a nickel-based superalloy rich in active elements
  • Purified smelting process of a nickel-based superalloy rich in active elements
  • Purified smelting process of a nickel-based superalloy rich in active elements

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preparation example Construction

[0036] The preparation of the master alloy ingot comprises the following steps (a)-(e):

[0037] (a) prepare each element raw material according to the chemical composition of the master alloy ingot;

[0038] (b) Put the Ni, Cr, and C elemental raw materials into the crucible, wherein: the Cr elemental material is placed in the middle of the crucible and surrounded by the Ni elemental material; the C elemental material is placed at the bottom of the crucible, and each raw material is pre-processed before being added to the crucible to be less than φ1mm particle;

[0039] (c) Melt the Ni, Cr and C raw materials in the crucible in a vacuum induction furnace, and ensure that the vacuum degree in the furnace is less than 10 during the smelting period -2 Pa, after the melt surface is stable, high temperature refining is carried out;

[0040] (d) After high-temperature refining, the temperature is naturally lowered, and when the temperature of the melt is lowered to the vicinity of ...

Embodiment 1

[0051] In this embodiment, the smelting master alloy is K417G, and the smelting quality is 10kg.

[0052] The design composition of master alloy-1 is shown in Table 2:

[0053] Table 2

[0054]

[0055] Master alloy preparation process (smelting in vacuum induction furnace, vacuum degree higher than 10 -2 Pa):

[0056] (1) High temperature refining: 1450℃×5min;

[0057] (2) After the melt temperature drops to 1420°C, add V, Zr, B, Y, Al and other elements in turn, and let stand for 1 min after the liquid level is stable;

[0058] (3) Low temperature refining: 1330℃×5min;

[0059] (4) Casting temperature: 1360°C.

[0060] The O content in Master Alloy-1 was measured to be 28 ppm, and the N content was 3 ppm.

[0061] The ingredients of the master alloy are shown in Table 3:

[0062] table 3

[0063]

[0064] Master alloy smelting process (smelting in vacuum induction furnace, vacuum degree higher than 10 -2 Pa):

[0065] (1) High temperature refining: 1500℃×5min...

Embodiment 2

[0071] This embodiment smelts the master alloy grade K417G, and the smelting quality is 50kg.

[0072] The design composition of master alloy-2 is shown in Table 4:

[0073] Table 4

[0074]

[0075]

[0076] Master alloy preparation process (smelting in vacuum induction furnace, vacuum degree higher than 10 -2 Pa):

[0077] (1) High temperature refining: 1450℃×10min;

[0078] (2) After the melt temperature drops to 1420°C, add V, Zr, B, Y, Al and other elements in turn, and let stand for 3 minutes after the liquid level is stable;

[0079] (3) Low temperature refining: 1330℃×10min;

[0080] (4) Casting temperature: 1360°C.

[0081] The O content in Master Alloy-2 was measured to be 29 ppm, and the N content was 4 ppm.

[0082] The ingredients of the master alloy are shown in Table 5:

[0083] table 5

[0084]

[0085] Master alloy smelting process (smelting in vacuum induction furnace, vacuum degree higher than 10 -2 Pa):

[0086] (1) High temperature refin...

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Abstract

The invention discloses a purified smelting process of a nickel-based superalloy rich in active elements, belonging to the technical field of metal smelting and casting. The process first prepares a master alloy ingot containing active elements: by weight percentage, the chemical composition of the master alloy ingot is: Cr 10-50%, Ti 5-30%, Al 0-1.0%, C 0.01-0.05% , Y 0.001~0.01%, A 0~5%, Ni is the balance; said A refers to trace elements; then use the master alloy ingot to smelt the master alloy; the principle of cutting master alloy is: do not add Cr or The elemental raw material of Ti element. The process of the invention can ensure the composition, impurities and gas requirements of the master alloy while shortening the smelting time, greatly improves the smelting efficiency and product quality of the master alloy, and has remarkable economic benefits.

Description

technical field [0001] The invention relates to the technical field of metal smelting and casting, in particular to a purification smelting process of a nickel-based superalloy rich in active elements. Background technique [0002] Nickel-based superalloys are usually used to manufacture the main structural parts of gas, turbine and other engines, which need to serve in ultra-high temperature environments. In order to ensure the high temperature mechanical properties of the alloy, high content of active elements such as Cr, Ti, and Al are often added in the composition design. Among them, Cr is a high temperature oxidation resistant element, which can improve the high temperature corrosion resistance of the alloy; Ti and Al are the main constituent elements of the γ' phase, which can increase the volume fraction of the γ' strengthening phase in the alloy. However, since Cr, Ti, and Al raw materials often carry more gas elements, if they are not completely removed as much as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/03C22C30/00C22C27/06
CPCC22C1/023C22C1/03C22C19/058C22C27/06C22C30/00
Inventor 谢君侯桂臣王振江荀淑玲周亦胄孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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