Method for preparing nickel-based alloy by stepwise adding carbon in melting process

A nickel-based alloy, step-by-step technology, applied in the field of nickel-based alloys, can solve the problems of increasing the difficulty of composition control and reducing the deoxidation capacity of C in the alloy, and achieve the effects of reducing porosity, achieving precise control and improving the pass rate.

Inactive Publication Date: 2011-03-30
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And when the alloy contains Cr element, the Cr element in the alloy is first loaded into the crucible and will react with the loaded C element to form carbides, thereby reducing the deoxidation abilit

Method used

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  • Method for preparing nickel-based alloy by stepwise adding carbon in melting process
  • Method for preparing nickel-based alloy by stepwise adding carbon in melting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The process of adding carbon step by step during the smelting process to prepare the nickel-based alloy is as follows.

[0032] (1) Furnace loading

[0033] In the crucible from bottom to top, 68% of the total amount of Ni, 18% of the total amount of C, all of Co, all of Mo, all of Cr and the remaining Ni were loaded in sequence.

[0034] 18% of the total amount of C, the remaining C, V-Al, Al, Ti, CrB and Zr were separately charged in the feeding tank.

[0035] (2) Melting of the alloy

[0036] A vacuum induction melting furnace is used for smelting. When the vacuum degree of the vacuum induction melting furnace is ≤0.67Pa, the temperature starts to rise, and the temperature rise rate is controlled to be 7°C / min until the charge is melted.

[0037] (3) Alloy refining

[0038] When the vacuum degree of the vacuum induction melting furnace after alloying is ≤1.33Pa, the temperature is raised to a refining temperature of 1530°C at a heating rate of 15°C / min, and the re...

Embodiment 2

[0051] The process of adding carbon step by step during the smelting process to prepare the nickel-based alloy is as follows.

[0052] (1) Furnace loading

[0053] In the crucible from bottom to top, 70% of the total amount of Ni, 20% of the total amount of C, all of Co, all of Mo and all of Cr are sequentially loaded, and the remaining Ni is loaded into the feeding tank.

[0054] Separately charge 20% of the total amount of C, the remaining C, V-Al, Al, Ti, CrB and Zr in the feeding tank.

[0055] (2) Melting of the alloy

[0056] A vacuum induction melting furnace is used for smelting. When the vacuum degree of the vacuum induction melting furnace is ≤0.67Pa, the temperature starts to rise, and the temperature rise rate is controlled to be 10°C / min until the charge is melted. After the charge is melted, add the Ni in the feeding tank into the crucible.

[0057] (3) Alloy refining

[0058] When the vacuum degree of the vacuum induction melting furnace after alloying is ≤1...

Embodiment 3

[0071] The process of adding carbon step by step during the smelting process to prepare the nickel-based alloy is as follows.

[0072] (1) Furnace loading

[0073] In the crucible from bottom to top, 66% of the total amount of Ni, 16% of the total amount of C, all of Co, all of Mo, all of Cr and the remaining Ni were loaded in sequence.

[0074] 16% of the total amount of C, the remaining C, V-Al, Al, Ti, CrB and Zr were separately charged in the feeding tank.

[0075] (2) Melting of the alloy

[0076] A vacuum induction melting furnace is used for smelting. When the vacuum degree of the vacuum induction melting furnace is ≤0.67Pa, the temperature starts to rise, and the temperature rise rate is controlled at 5°C / min until the charge is melted.

[0077] (3) Alloy refining

[0078] When the vacuum degree of the vacuum induction melting furnace after alloying is ≤1.33Pa, the temperature is raised to the refining temperature of 1520°C at a heating rate of 10°C / min, and the ref...

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Abstract

The invention discloses a method for preparing a nickel-based alloy by stepwise adding carbon in a melting process, which comprises: adding 66 to 70 percent of the total Ni, 16 to 20 percent of the total C, total Co, total Mo, total Cr and the rest Ni into a crucible in turn, or adding the rest Ni into a feeding tank; adding 16 to 20 percent of total C, the rest C, V-Al, Al, Ti, CrB and Zr into a feeding tank separately, namely, adding 16 to 20 percent of the total C in a refining period, the rest C in an alloying period and V-Al, Al and Ti in turn after the C is melted completely; and performing cold treatment, heating and pouring. In the invention, the technique for adding the C can reduce the gas content of the alloy; and thus, the drawbacks such as looseness caused by high gas content of the alloy in a casting forming process are overcome and the precise control of the alloy elements is realized on the premise that the deoxidation effect of the C is fully played.

Description

technical field [0001] The invention belongs to the technical field of nickel-based alloys, and in particular relates to a method for preparing nickel-based alloys by adding carbon step by step in a smelting process. Background technique [0002] The addition of C element during the smelting process of nickel-based alloys uses part of the C element to be directly loaded into the crucible during the smelting process. This part of the C element mainly plays the role of deoxidation during the alloy smelting process, which is beneficial to the removal of gas in the alloy and reduces the gas content in. And when the alloy contains Cr element, the Cr element in the alloy is first loaded into the crucible and will react with the loaded C element to form carbides, thereby reducing the deoxidation ability of C in the alloy. If the C content in the crucible is too high High, will directly affect the control of the chemical composition of C in the alloy, increasing the difficulty of c...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C19/05
Inventor 孟丽华吴庭宝王铁军倪伟贾石
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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