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Pre-melting slag for high-temperature alloy electroslag remelting

An electroslag remelting and superalloy technology, applied in the field of superalloy smelting, can solve the problems of Zr element content difference, Zr element burning loss, difficulty, etc., to reduce content inhomogeneity, improve composition uniformity, and improve surface quality Effect

Inactive Publication Date: 2019-03-29
西安聚能高温合金材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is still difficult to accurately control these active elements in electroslag smelting of superalloys.
[0004] Electroslag remelting pre-melting slag is very important to the composition control in the alloy melting process, the commonly used CaF 2 :Al 2 o 3 : CaO pre-melting slag can not solve the problem of Zr element burning loss in the superalloy smelting process, the yield of Zr element in the smelted electroslag ingot is low and unstable, and the Zr element content in different parts of the ingot head and tail exists Significant differences

Method used

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  • Pre-melting slag for high-temperature alloy electroslag remelting
  • Pre-melting slag for high-temperature alloy electroslag remelting
  • Pre-melting slag for high-temperature alloy electroslag remelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Electroslag remelting of GH4720Li alloy.

[0021] This example uses the pre-melted slag of the present invention and the comparative pre-melted slag to carry out electroslag melting of the Zr-containing superalloy GH4720Li alloy. The main components of GH4720Li are shown in Table 1, and the electrodes used are those cast by vacuum induction melting. The pre-melted slag used is configured according to the predetermined composition, and the pre-melted treatment is carried out after mixing evenly, and the FeO and SiO are reduced after treatment. 2 content while reducing the water content. The slag after pre-melting treatment is sealed and stored to prevent moisture absorption. The Zr content in the sensing electrode is 0.035 (wt.%).

[0022]

[0023] The pre-slag of embodiment 1:

[0024] CaF 2 :50%, Al 2 o 3 :20%, CaO: 20%, MgO: 3%, TiO 2 :3%, ZrO 2 : 3%, impurity: 1%.

[0025] Compared with pre-slag:

[0026] CaF 2 :50%, Al 2 o 3 : 23%, CaO: 20%, MgO: 3%...

Embodiment 2

[0031] Electroslag remelting of GH4738 alloy.

[0032] This example uses the pre-melted slag of the present invention and the comparative pre-melted slag to carry out electroslag melting of the Zr-containing superalloy GH4738 alloy. The main components of GH4738 are shown in Table 1, and the electrodes used are those cast by vacuum induction melting. The pre-melted slag used is configured according to the predetermined composition, and the pre-melted treatment is carried out after mixing evenly, and the FeO and SiO are reduced after treatment. 2 content while reducing the water content. The slag after pre-melting treatment is sealed and stored to prevent moisture absorption. The Zr content in the sensing electrode is 0.05 (wt.%).

[0033]

[0034] Embodiment 2 pre-melted slag:

[0035] CaF 2 :50%, Al 2 o 3 : 20%, CaO: 18%, MgO: 3%, TiO 2 :3%, ZrO 2 : 5%, impurities: 1%.

[0036] Compared with pre-slag:

[0037] CaF 2 :50%, Al 2 o 3 : 23%, CaO: 20%, MgO: 3%, Ti...

Embodiment 3

[0042] CaF 2 : 60%; Al 2 o 3 : 25%; CaO: 10%; MgO: 1%;

[0043] TiO 2 : 1; ZrO 2 : 3%.

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Abstract

The invention discloses pre-melting slag for high-temperature alloy electroslag remelting. The pre-melting slag for high-temperature alloy electroslag remelting comprises the following components of,by weight, 50%-60% of CaF2, 15%-25% of Al2O3, 10%-20% of CaO, 1%-5% of MgO, 1%-5% of TiO2, and 2%-10% of ZrO2. The pre-melting slag is used for improving the uniformity of the components of a high-temperature alloy cast ingot, and the problems that the Zr element content in electroslag remelting is difficult to control and segregation is caused are solved; and the characteristics that the surfacequality of the electroslag ingot is improved, and the effect of removing included impurities is not affected are achieved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy smelting, and in particular relates to a pre-melted slag for high-temperature alloy electroslag remelting. Background technique [0002] As a material for advanced aero-engines, superalloys have excellent comprehensive properties at high temperatures, and are currently the preferred materials for key hot-end components in aero-engines. In order to improve material properties, there are many types of alloying elements and high content in superalloys. These higher alloying elements are prone to burning loss during electroslag smelting, resulting in segregation of ingot components. [0003] Trace element Zr is added to many high-temperature alloys to improve the bonding force of grain boundaries and strengthen the grain boundaries. The chemical properties of Zr are relatively active, and it is easy to burn out in the process of electroslag remelting, while the content of Zr in superal...

Claims

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Application Information

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IPC IPC(8): C22B9/18C22C1/06
CPCC22B9/18C22C1/06
Inventor 张建伟付宝全李南曹国鑫薛建飞史新波王玮东
Owner 西安聚能高温合金材料科技有限公司
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