Purification smelting process for nickel-based high temperature alloy rich in active element

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

Active Publication Date: 2020-01-31
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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  • Purification smelting process for nickel-based high temperature alloy rich in active element
  • Purification smelting process for nickel-based high temperature alloy rich in active element
  • Purification smelting process for nickel-based high temperature alloy rich in active element

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Experimental program
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preparation example Construction

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

[0037] (a) Prepare the raw materials of each element in accordance with the chemical composition of the master alloy ingot;

[0038] (b) Put Ni, Cr, and C elemental raw materials into the crucible, wherein: Cr elemental raw material is placed in the middle of the crucible, surrounded by Ni elemental raw material; C elemental raw material is placed at the bottom of the crucible, and each raw material is pre-processed to be less than φ1mm before adding to the crucible 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 lower than 10 during smelting -2 Pa, after the surface of the melt is stabilized, high-temperature refining is carried out;

[0040] (d) Cool down naturally after high-temperature refining. When the melt temperature drops to near the liquidus temperature, add trace elemen...

Embodiment 1

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

[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 temperature of the melt drops to 1420°C, add V, Zr, B, Y, Al and other simple substances in sequence, and wait for 1 minute after the liquid level is stable;

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

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

[0060] The measured O content in Master Alloy-1 was 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 (vacuum induction furnace smelting, vacuum degree higher than 10 -2 Pa):

[0065] (1) High temperature refinin...

Embodiment 2

[0071] In this embodiment, the smelted master alloy grade is K417G, and the smelted quality is 50 kg.

[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 elemental substances in sequence, and wait for 3 minutes after the liquid level is stable;

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

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

[0081] The measured O content in Master Alloy-2 was 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 (vacuum induction furnace smelting, vacuum degree higher than 10 -2 Pa):

[0086] (1) High temperat...

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Abstract

The invention discloses a purification smelting process for nickel-based high temperature alloy rich in active element, and belongs to the technical field of metal smelting and casting. The process comprises the step of firstly, preparing intermediate alloy ingot rich in active element. The intermediate alloy ingot is prepared from, by weight percentage, 10-50% of Cr, 5-30% of Ti, 0-1.0% of Al, 0.01-0.05% of C, 0.001-0.01% of Y, 0-5% of A and the balance Ni. A refers to the trace element. The intermediate alloy ingot is utilized for smelting mother alloy. According to the cutting principle ofthe intermediate alloy, elementary substance raw materials of the Cr or Ti element are not added during mother alloy smelting. By means of the process, the requirement for the components, impurities and gas of the mother alloy can be met while the smelting time is shortened, the smelting efficiency and product quality of the mother alloy are greatly improved, and the economic benefit is significant.

Description

technical field [0001] The invention relates to the technical field of metal smelting and casting, in particular to a purified 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, a relatively high content of active elements such as Cr, Ti, and Al is often added in the composition design. Among them, Cr is an anti-high temperature oxidation 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 elemental raw materials often carry more gas elements, if they are not completely remo...

Claims

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Application Information

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Patent Type & Authority Applications(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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