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A Vacuum Induction Melting Method for Reducing Nitrogen Content in Superalloy

A vacuum induction melting and superalloy technology, applied in the field of superalloy smelting, can solve the problems of poor denitrification effect and high production cost, and achieve the effect of being easy to implement and reducing the formation of nitride inclusions

Active Publication Date: 2018-05-18
BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a vacuum induction smelting method for reducing nitrogen content in superalloys, which solves the problems of poor denitrification effect and high production cost of existing vacuum smelting technology for superalloys

Method used

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  • A Vacuum Induction Melting Method for Reducing Nitrogen Content in Superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Alloy composition distribution point and raw material purity are as shown in table 1 in the present embodiment

[0021] Table 1

[0022] element

Cr

Mo

Fe

Al

Ti

Nb

C

Ni

Distribution point (wt.%)

19.0

3.02

17.9

0.65

1.05

5.0

0.045

Remain

Raw material purity (%)

99.0

99.6

99.9

99.7

99.6

99.9

-

99.96

[0023] 1) Alloy smelting: 40-50% Ni, all Fe, furnace C, all Mo, all Cr and remaining Ni are sequentially loaded from bottom to top in the crucible in the vacuum induction furnace. Then vacuumize, when the vacuum degree reaches 2Pa, use 120KW power to heat and discharge the gas attached to the charge; when the vacuum degree reaches 1Pa, start to melt the charge with 250KW power until the charge is completely melted; after the charge is completely melted, the alloy liquid is melted , the temperature is lowered at a rate of 5°C / min to freeze the conjunctiva on the surface o...

Embodiment 2

[0034] Present embodiment alloy joins point and raw material purity see table 4

[0035] Table 4

[0036] element

Cr

Fe

Al

Ti

Nb

C

Ni

Distribution point (wt.%)

15.5

7.0

0.85

2.59

1.00

0.04

margin

Raw material purity (%)

99.0

99.9

99.0

99.0

99.9

-

99.9

[0037] 1) Alloy smelting: 40-50% Ni, all Fe, all C, all Cr and remaining Ni are sequentially charged from the bottom to the top in the crucible in the vacuum induction furnace. Then vacuumize, when the vacuum degree reaches 1Pa, use 150KW power to heat and discharge the gas attached to the charge; when the vacuum degree reaches 0.8Pa, start to melt the charge with 220KW power until the charge is completely melted; the charge is completely melted, and the alloy liquid is melted Finally, lower the temperature at a rate of 6°C / min to freeze the conjunctiva on the surface of the alloy liquid, and then add all the Nb; after adding Nb, ra...

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Abstract

The invention discloses a vacuum induction melting method for reducing the nitrogen content in high temperature alloy and belongs to the technical field of high temperature alloy smelting. Niobium which belongs to high nitride-forming elements is added at the later stage of material melting instead of adding along with a furnace and added after N in alloy melt is mostly removed, so that forming of a core with hard-to-decompose nitride inclusion is reduced, and Al, Ti and the like which are prone to be damaged after being burnt and the elements with high affinity to N are added at the later stage of refining. The vacuum induction melting method for reducing the nitrogen content in the high temperature alloy has the advantages that the adding sequence of raw materials is merely required to be adjusted, the operation is simple, the method is easy to implement, and the metallurgical quality of the high temperature alloy in actual industrial production can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of superalloy smelting, and in particular relates to a vacuum induction melting method for reducing nitrogen content in superalloys. Background technique [0002] High-temperature alloys are generally used at high temperatures above 600°C, and are subjected to relatively large and complex stresses, and the operating environment is extremely harsh. Whether it is a cast superalloy or a deformed superalloy, its quality and working performance mainly depend on the metallurgical quality of the master alloy, so how to obtain a low-impurity and high-purity master alloy is extremely important. N, O, H, etc. in superalloys are called residual gases and are classified as harmful elements. The existence of these three harmful elements increases the content of inclusions in the alloy and has a significant adverse effect on the properties of the alloy. [0003] Although carbon can be used as a deoxidizer in the vacuum s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/04C22B23/00
CPCY02P10/25
Inventor 安宁田建军李振瑞牛永吉李崇巍刘海稳徐静玉
Owner BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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