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Method for melting nickel-base high-temperature return material K441alloy

A technology of nickel-based superalloy and return materials, which is applied in the field of metallurgy and can solve problems such as waste

Inactive Publication Date: 2010-06-02
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of the casting, more than 60% of the molten alloy is used as the return material of the rigging system, and a part of the waste casting will be produced, and the utilization rate of the alloy is only 20-30%, resulting in waste in the production process, especially for high-temperature alloys. Ni, Cr, W, Mo, etc. are all precious metals that are scarce in the country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Sandblast the returned materials and waste castings generated when the nickel-based superalloy K441 is used to prepare blades, clean the surface of the returned materials and waste castings, and then place them in a vacuum induction furnace at the same time to start vacuuming. When the vacuum degree is ≤ At 1.33Pa, send electricity to raise the temperature to 1650°C, and refine for 20 minutes. During the melting process of the alloy melt, the vacuum degree is controlled to be ≤10.66Pa, and during the refining process, the vacuum degree is controlled to be ≤1.33Pa; after refining, the temperature is lowered to the surface of the alloy melt. Heat the alloy melt of the conjunctiva to 1540°C and cast it into a primary ingot.

[0021] The chemical composition of the primary ingot was analyzed by weight percentage as Al 3.68%, W 12.10%, Cr15.56%, Mo 1.88%, Zr 0.019%, B 0.0066%, C0.031%, and the balance was Ni. According to the chemical composition, it is all within the requir...

Embodiment 2

[0026] Sand blast the returned material produced when the nickel-based superalloy K441 is used to prepare blades, clean the surface of the returned material, and then place it in a vacuum induction furnace to start vacuuming the vacuum equipment. Refining at 1620°C, where the alloy melt requires a vacuum degree of ≤10.66Pa during the melting process, refining for 30 minutes, and controlling the vacuum degree of ≤1.33Pa during the refining process; after refining, cool down to the conjunctiva on the surface of the alloy melt. Heat the alloy melt of the conjunctiva to 1580°C and pour it into a primary ingot.

[0027] The chemical composition of the primary ingot was analyzed by weight percentage as Al 3.64%, W 11.48%, Cr 15.30%, Mo 1.78%, Zr 0.023%, B 0.009%, C0.025%, and the balance was Ni. According to the chemical composition, it can be seen that both W and B exceed the composition range, and the composition needs to be adjusted by adding the adjustment element composition ma...

Embodiment 3

[0033] Sand blast the waste castings produced when the nickel-based superalloy K441 is used to prepare blades, clean the surface of the waste castings, and then place them in a vacuum induction furnace to start vacuuming. Refining at 1590°C for 40 minutes, wherein the vacuum degree is controlled to be ≤10.66Pa during the melting process of the alloy melt, and the vacuum degree is ≤1.33Pa during the refining process; after refining, the temperature is lowered to a conjunctival film on the surface of the alloy melt. Heat the alloy melt of the conjunctiva to 1500°C and cast it into a primary ingot.

[0034] The chemical composition of the primary ingot was analyzed by weight percentage as Al 3.68%, W 11.48%, Cr 15.60%, Mo 1.78%, Zr 0.023%, B 0.0075%, C0.027%, and the balance was Ni. According to this chemical composition, it can be seen that W exceeds the composition range, and needs to be adjusted and added to adjust the ingredients. Prepare the tungsten element material as the...

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Abstract

The invention relates to a method for melting nickel-base high-temperature return material K441 alloy, comprising the following steps: refining the return material and / or waste cast pieces in a vacuum induction furnace, decreasing the temperature of molten alloy and casting the molten alloy into a primary material ingot, analyzing the chemical components of the primary material ingot and adjusting the components of the molten alloy by adopting the nickel, aluminum, tungsten, chromium, molybdenum, zirconium, chromium boron master alloy and / or the carbon as the adjusting element component material; refining the primary material ingot and the nickel, the tungsten, the chromium and / or the molybdenum in the adjusting element component material for the second time and heating to cast the molten alloy after a film forming on the molten alloy or adding the carbon, aluminum, chromium boron master alloy and / or the zirconium to the molten alloy to alloy and heating to cast the molten alloy into an alloy ingot after a film forming on the molten alloy. The qualification rate of the return material K441 alloy produced with the method is equal to the qualification rate of the cast piece produced from the new material, and the initial melting temperature of the return material K441 alloy is higher than the initial melting temperature of the alloy produced from the new material with the original production technology.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an alloy smelting method for returned materials of nickel-based superalloy K441. Background technique [0002] K441 alloy is a material for engine guide vanes. The outstanding features of this alloy are low carbon content, high Cr and W content; high initial melting temperature, good ultra-high temperature transient performance, and good cold and heat resistance fatigue performance. Preliminary experiments have shown that when the carbon content is high, the problem of blade cracks in the alloy casting process is more serious. Through technical improvement, the pass rate of alloy cast blades has reached about 60%, and the performance can meet production needs. The alloy can replace the X40 alloy for the manufacture of blades of aero-engines, and can be further expanded and applied to other combustion engines. In the production process of the casting, more than 60...

Claims

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Application Information

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IPC IPC(8): C22B23/06
Inventor 于兴福崔树森吴廷宝王铁军祝世哲宁英丁书亮杨树林张玉忱王延辉王玉娟张瑞珍杨胜群
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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