Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Vacuum Induction Melting Process for Reducing O, N, S Contents in Nickel-Based Superalloys

A nickel-based superalloy, vacuum induction melting technology, applied in the field of alloy melting, can solve the problems of restricting the application and development of superalloy, unreasonable melting process, etc.

Active Publication Date: 2019-01-11
JIANGSU LONGDA SUPERALLOY MATERIAL CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the relatively mature vacuum induction melting in foreign countries can reduce the total content of O, N, and S in the alloy to below 20ppm. The O content in the smelted alloy is as high as 40ppm, the N content is as high as 30ppm, and the total content of O, N, and S can only be controlled at 20ppm at the lowest level, which has a significant gap with foreign countries, thus restricting the practical application and further development of superalloys in my country

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The invention provides a vacuum induction smelting process for reducing the content of O, N and S elements in a nickel-based superalloy. The chemical composition (mass fraction) of the nickel-based superalloy is: 0.7% Al, 15.5% Cr, 3.0% Mo, 6.5% Ta+Nb, 0.8% Ti, 16% Fe, 0.08% C, 0.002% B, 0.015% Zr, the balance being Ni, smelting 2000kg alloy in a single furnace.

[0032] Specific steps are as follows:

[0033] 1. Raw material preparation: Polish off the oxides and attached sundries on the surface of the required raw materials, put them into alcohol or acetone solution and use ultrasonic cleaning, after cleaning, put them into an oven at 60-80°C for 8h-10h drying.

[0034] 2. Arrangement of charge: before smelting, materials should be placed in the crucible in a specific order, and about 1 / 3 of Ni blocks, 1 / 2 of C rods, all Ta blocks, Mo blocks, Cr blocks, Fe blocks, and the remaining 2 / 3 Ni block.

[0035]3. The first smelting: Use a vacuum induction furnace for smelt...

Embodiment 2

[0043] The invention provides a vacuum induction smelting process for reducing the content of O, N and S elements in a nickel-based superalloy. The chemical composition (mass fraction) of the nickel-based superalloy is: 0.6% Al, 19.0% Cr, 3.0% Mo, 6.5% Ta+Nb, 0.9% Ti, 17% Fe, 0.05% C, 0.004% B, 0.03% Zr, the balance being Ni, smelting 2000kg alloy in a single furnace.

[0044] Specific steps are as follows:

[0045] 1. Raw material preparation: Polish off the oxides and attached sundries on the surface of the required raw materials, put them in alcohol or acetone solution and use ultrasonic cleaning, and put them in an oven at 80°C for 8 hours to dry after cleaning.

[0046] 2. Arrangement of charge: before smelting, materials should be placed in the crucible in a specific order, and about 1 / 3 of Ni blocks, 1 / 2 of C rods, all Ta blocks, Mo blocks, Cr blocks, Fe blocks, and the remaining 2 / 3 Ni block.

[0047] 3. The first smelting: Use a vacuum induction furnace for smelting...

Embodiment 3

[0055] The invention provides a vacuum induction melting process for reducing the content of O, N and S elements in a nickel-based superalloy. The chemical composition (mass fraction) of the nickel-based superalloy is: 0.65% Al, 22.5% Cr, 2.8% Mo, 7.0% Ta+Nb, 0.6% Ti, 15% Fe, 0.02% C, 0.006% B, 0.05% Zr, the balance being Ni, smelting 2000Kg alloy in a single furnace.

[0056] Specific steps are as follows:

[0057] 1. Raw material preparation: Polish off the oxides and attached sundries on the surface of the required raw materials, put them into alcohol or acetone solution and use ultrasonic cleaning, after cleaning, put them into an oven at 60-80°C for 8h-10h drying.

[0058] 2. Arrangement of charge: before smelting, materials should be placed in the crucible in a specific order, and about 1 / 3 of Ni blocks, 1 / 2 of C rods, all Ta blocks, Mo blocks, Cr blocks, Fe blocks, and the remaining 2 / 3 Ni block.

[0059] 3. The first smelting: Use a vacuum induction furnace for smelt...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a vacuum induction melting technology for reducing the content of O, N and S in nickel-base superalloy, and belongs to the technical field of alloy melting. According to the vacuum induction melting technology, the nickel-base superalloy is obtained through primary melting and refining, secondary refining, secondary melting, tertiary refining, quartus refining and tertiary melting. The technology of adding C several times is adopted, and therefore the O content in melt can be further reduced; after primary melting is finished, the temperature continues to be reduced after melt film formation till the melt is completely solidified, and in the meanwhile, O and N in the alloy can be further discharged along with reduction of the solubility of the alloy melt and the solid solubility of the solidified alloy; a ceramic filter net is adopted for filtration, and therefore the content of O, N and S in the melt and impurities in the melt can be reduced to the maximum degree; and by the adoption of the distribution method and the melting technology, the total content of O, N and S in the alloy can be reduced to be below 12ppm.

Description

technical field [0001] The invention relates to a vacuum induction smelting process for reducing O, N, and S contents in nickel-based superalloys. Alloy melting technology field. Background technique [0002] Nickel-based superalloys are multi-element alloys with very complex compositions. Each alloy raw material contains more or less a certain amount of S element; at the same time, most alloys contain strong oxide and strong nitride forming elements, such as Nb, Ti, Al; in addition, as an essential alloying element, Cr contains a large amount of N in its raw materials, so O, N, and S have been unable to be obtained during the smelting process of alloys with high content of the above elements. Effective removal. When the content of O element and N element in nickel-based superalloy is high, it is easy to form oxides and nitrides, and when the content of S is high, it will weaken the grain boundary and phase boundary, and at the same time promote the precipitation of harmfu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C1/06C22C19/05
CPCC22C1/023C22C1/06C22C19/055C22C19/056
Inventor 王颜臣王博谢建新王俊肖丽俊祝国梁浦益龙周向东吕斌
Owner JIANGSU LONGDA SUPERALLOY MATERIAL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com