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Slag system for smelting GH3625 nickel-base alloy containing rare earth Ce and electroslag remelting smelting method thereof

A nickel-based alloy and slag system technology, applied in the field of metallurgy, can solve problems such as burning of Ce elements, achieve the effects of good composition quality, solve burning loss of easily oxidizable elements, and uniform distribution of elements

Active Publication Date: 2020-05-12
上海一郎合金材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the GH3625 alloy containing rare earth Ce has certain problems in smelting, that is, the burning loss of Ce element and other easily oxidizable elements in the alloy after the secondary refining of electroslag remelting, so it is necessary to develop a new electroslag remelting process to solve this problem

Method used

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  • Slag system for smelting GH3625 nickel-base alloy containing rare earth Ce and electroslag remelting smelting method thereof
  • Slag system for smelting GH3625 nickel-base alloy containing rare earth Ce and electroslag remelting smelting method thereof
  • Slag system for smelting GH3625 nickel-base alloy containing rare earth Ce and electroslag remelting smelting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In the present embodiment, the crystallizer diameter is 150mm, and the chemical composition of the slag system used is configured according to the following mass percentages: CaF 2 : 38%, CaO: 24%; Al 2 o 3 : 20%; NaF: 6%; MgO: 4%; TiO 2 : 2%; CeO 2 : 5%; SiO 2 :1%.

[0038] During the smelting process using the above slag system, smelting is carried out according to the smelting method of the present invention. During the smelting process, aluminum particles are added to the slag pool in an amount of 1 g per kilogram of alloy.

[0039] At the same time, another group of notoginseng slag is smelted, and the chemical composition of notoginseng slag is configured according to the following mass percentage: CaF 2 : 70%; Al 2 o 3 : 30%.

[0040] In the smelting process using notoginseng slag, no aluminum particles are added.

[0041] After smelting, the ingots were detected by ICP and nitrogen and oxygen analyzers, and the chemical analysis results are shown in Tab...

Embodiment 2

[0046] In the present embodiment, the crystallizer diameter is 260mm, and the chemical composition of the slag system used is configured according to the following mass percentages: CaF 2 : 38%, CaO: 24%; Al 2 o 3 : 20%; NaF: 6%; MgO: 4%; TiO 2: 2%; CeO 2 : 5%; SiO 2 :1%.

[0047] In this example, three GH3625 alloys with different Ce contents were used for electroslag remelting.

[0048] During the smelting process using the above slag system, smelting is carried out according to the smelting method of the present invention. During the smelting process, aluminum particles are added to the slag pool in an amount of 1 g per kilogram of alloy.

[0049] The composition of the cast ingot after smelting was detected by ICP and nitrogen and oxygen analyzer, and the chemical analysis results are shown in Table 2.

[0050] Table 2 GH3625 alloy components content

[0051]

[0052] The smelting results show that the slag system and smelting method of the present invention effe...

Embodiment 3

[0054] In this embodiment, the diameter of the crystallizer is 260 mm, and the chemical components of the three slag systems used are configured according to the following mass percentages: S1: CaF 2 : 42%, CaO: 24%; Al 2 o 3 : 20%; NaF: 7%; MgO: 4%; TiO 2 : 2%; SiO 2 : 1%; S2: CaF 2 : 39%, CaO: 24%; Al 2 o 3 : 20%; NaF: 7%; MgO: 4%; TiO 2 : 2%; CeO 2 : 3%; SiO 2 : 1%; S3: CaF 2 : 36%, CaO: 24%; Al 2 o 3 : 20%; NaF: 7%; MgO: 4%; TiO 2 : 2%; CeO 2 : 6%; SiO 2 :1%.

[0055] In this embodiment, the GH3625 alloy with the same composition is used for electroslag remelting.

[0056] During the smelting process using the above slag system, smelting is carried out according to the smelting method of the present invention. During the smelting process, aluminum particles are added to the slag pool in an amount of 1 g per kilogram of alloy.

[0057] After smelting, the ingots were detected by ICP and nitrogen and oxygen analyzers, and the chemical analysis results are sho...

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Abstract

The invention relates to a slag system for smelting a GH3625 nickel-base alloy containing rare earth Ce and an electroslag remelting smelting method thereof. The slag system comprises, by weight, 20-25% of CaO, 17-21% of Al2O3, 5-7% of NaF, 3-5% of MgO, 1-2% of TiO2, 4-6% of CeO2, 1-2% of SiO2, and the balance CaF2. The slag system is suitable for electroslag remelting smelting of the GH3625 alloycontaining rare earth, and the problem of Ce, Al and Ti burning loss in the process of electroslag remelting smelting of the GH3625 alloy containing Ce can be well solved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a slag system for smelting a GH3625 nickel-based alloy containing rare earth Ce and an electroslag remelting smelting method thereof. Background technique [0002] Nickel-based alloy GH3625 is a solid-solution-strengthened nickel-based deformed superalloy. It was originally developed internationally as a boiler steam pipe material for high-strength supercritical thermal power units. However, due to its excellent mechanical properties, machinability, The combination of corrosion resistance, stability and weldability makes it one of the most successful nickel-based superalloys for long-term engineering applications. [0003] The current smelting process for producing GH3625 alloy is vacuum induction melting (VIM) + vacuum arc melting (VAR). However, VAR has almost no ability to remove impurity elements, and it is easy to bring into the crucible material during smelting, causing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22C1/03C22C19/05
CPCC22B9/18C22C1/023C22C1/03C22C19/058
Inventor 付华清司周祥刘小佩徐晓平姜周华董艳伍李毓硕董君伟
Owner 上海一郎合金材料有限公司
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