Method for improving component uniformity of W elements in GH4720Li alloy

A technology of element composition and uniformity, which is applied in the field of improving the uniformity of W element composition of GH4720Li alloy, can solve problems such as uneven distribution of W elements, and achieve the effects of solving performance uniformity, uniform distribution of W elements, and solving composition differences

Active Publication Date: 2017-05-17
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving the uniformity of the W element composition of the GH4720Li alloy, which solves the problem of uneven distribution of the W element existing in the existing Φ440-560mm specification GH4720Li ingot

Method used

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  • Method for improving component uniformity of W elements in GH4720Li alloy
  • Method for improving component uniformity of W elements in GH4720Li alloy
  • Method for improving component uniformity of W elements in GH4720Li alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Melting GH4720Li superalloy ingots with a diameter of Φ510mm.

[0042] 1. Raw material processing:

[0043] Electrolytic Ni and electrolytic cobalt are subjected to surface sandblasting, and after treatment, they are dried with nickel-tungsten alloy, nickel-molybdenum alloy, pure titanium, pure aluminum, and pure chromium at 100°C for 10 hours.

[0044] 2. Ingredients:

[0045] Determine the alloy ratio, and feed according to the ratio. The alloy ratio and the raw materials and amounts used are shown in Tables 2 and 3.

[0046] Table 2 Alloy chemical composition ratio, wt%

[0047]

[0048] Table 3 raw materials and dosage

[0049]

[0050] 3. Vacuum induction melting:

[0051] The ingot mold of Φ350mm is used for vacuum induction melting, the melting speed is 700kg / h, the refining temperature is 1480℃, and the refining time is 60min; the pouring temperature is 1480℃. Grinding is done after smelting.

[0052] 4. Vacuum consumable melting:

[0053] The electro...

Embodiment 2

[0058] Melting GH4720Li superalloy ingots with a diameter of Φ440mm.

[0059] 1. Raw material processing:

[0060] Electrolytic Ni and electrolytic cobalt are subjected to surface sandblasting, and after treatment, they are dried with nickel-tungsten alloy, nickel-molybdenum alloy, pure titanium, pure aluminum, and pure chromium at 100°C for 10 hours.

[0061] 2. Ingredients:

[0062] Determine the alloy ratio, and feed according to the ratio. The alloy ratio, raw materials and amounts used are shown in Tables 5 and 6.

[0063] Table 5 Alloy chemical composition ratio, wt%

[0064]

[0065] Table 6 raw materials and dosage

[0066]

[0067] 3. Vacuum induction melting:

[0068] Vacuum induction melting uses Φ280mm ingot mold, melting speed is 300kg / h, refining temperature is 1450℃, refining time is 30min; pouring temperature is 1450℃. Grinding is done after smelting.

[0069] 4. Vacuum consumable melting:

[0070] The electrode is turned around for welding and sme...

Embodiment 3

[0075] Melting GH4720Li superalloy ingots with a diameter of Φ560mm.

[0076] 1. Raw material processing:

[0077] Electrolytic Ni and electrolytic cobalt are subjected to surface sandblasting, and after treatment, they are dried with nickel-tungsten alloy, nickel-molybdenum alloy, pure titanium, pure aluminum, and pure chromium at 100°C for 10 hours.

[0078] 2. Ingredients:

[0079] Determine the alloy ratio, and feed according to the ratio. The alloy ratio, raw materials and consumption are shown in Tables 8 and 9.

[0080] Table 8 Alloy chemical composition ratio, wt%

[0081]

[0082] Table 9 Materials and dosage

[0083]

[0084] 3. Vacuum induction melting:

[0085] Vacuum induction melting uses a Φ400mm ingot mold, the melting speed is 700kg / h, the refining temperature is 1550°C, and the refining time is 90min; the pouring temperature is 1550°C. Grinding is done after smelting.

[0086] 4. Vacuum consumable melting:

[0087] The electrode is turned around ...

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Abstract

The invention discloses a method for improving the component uniformity of W elements in GH4720Li alloy. Pure metallic W is replaced with nickel-tungsten intermediate alloy, a smelting mode with vacuum induction smelting and two times of vacuum consumable smelting is adopted, and low-smelting-speed controlled smelting is adopted for the second time of vacuum consumable smelting. On the premise that the yield of cast ingots is not decreased, the W elements in the cast ingots are distributed more uniformly. The problem of component difference in all positions of the cast ingots due to nonuniform distribution of the W elements, and accordingly the forging process of the alloy is influenced is solved, and the method has important functions on improving the component uniformity of the W elements and the performance uniformity of forge pieces.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy smelting, and in particular relates to a method for improving the uniformity of W element composition of GH4720Li alloy. Background technique [0002] GH4720Li is a nickel-based aging-strengthened superalloy, mainly used to manufacture high-performance compressors and turbine disks with a service temperature of 650-750°C and turbine disks used at 900°C in a short period of time. The alloying degree of GH4720Li is very high, which also brings about the segregation of alloying elements in the superalloy ingot. The smelted ingot is easy to form low melting point γ+γ’ eutectic, η phase and Ni due to segregation during solidification. 5 Zr and other low-melting-point microstructures make it difficult for subsequent homogenization treatment and forging, and also pose a severe test to the deformation of GH720Li. [0003] The content of alloying elements in the alloy is as high as 40%, Al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C19/05
CPCC22C1/03C22C19/056
Inventor 曹国鑫付宝全王玮东杜刚齐锐孙剑刘向宏张平祥冯勇
Owner 西部超导材料科技股份有限公司
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