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Nickel-based superalloy electroslag remelting slag system

A nickel-based superalloy, electroslag remelting technology, applied in the field of nickel-based superalloy electroslag remelting slag system, can solve the problems of increasing the number of oxide inclusions, difficult to accurately control alloy composition, affecting the quality and processing performance of steel ingots, etc. , to achieve the effects of good anti-water absorption and air absorption, easy processing and deformation, and enhanced machinability

Inactive Publication Date: 2017-06-13
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This electroslag remelting slag system has the following defects: 1. The components are not at the eutectic point of eutectic melting, and the melting point is high; 2. The electrical conductivity of the slag system is high, and the power consumption for remelting is high; 3. After electroslag remelting The inclusions in the steel ingot are mainly brittle aluminate and corundum, which affect the plasticity and toughness of the electroslag remelted steel ingot
[0006] 1. Due to the strong water absorption of the added CaO, hydrogen and oxygen elements are easily brought in during the smelting process, which increases the number of oxide inclusions in the electroslag remelted steel ingot and affects the properties of the alloy
[0007] 2. The electroslag remelting slag system containing CaO has strong gas permeability, which causes the easily oxidizable elements in the droplets to be burned during the remelting process, and it is difficult to accurately control the alloy composition
[0008] 3. CaO-containing electroslag remelting slag is easy to cause porosity defects in electroslag remelting steel ingots due to its strong water absorption and good air permeability, which affects the quality of steel ingots and subsequent processing performance

Method used

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  • Nickel-based superalloy electroslag remelting slag system
  • Nickel-based superalloy electroslag remelting slag system
  • Nickel-based superalloy electroslag remelting slag system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Preparation of self-fusing electrode rod

[0027] Take the components in Table 1, with a total weight of 31kg, and prepare a GH3536 nickel-based superalloy self-fusing electrode rod with a diameter of φ100mm by vacuum induction melting and casting.

[0028] Table 1 Composition ratio wt% of GH3536 superalloy

[0029] C Si mn Mo Cr W co Fe Ni 0.098 0.15 0.17 8.74 21.20 0.69 1.56 18.43 margin

[0030] 2) Configure electroslag remelting slag system

[0031] Weigh CaF 2 4.20kg, Al 2 o 3 0.96kg, MgO0.72kg, SiO 2 0.12kg, of which the impurity content is less than 1.0%, and the impurity is unavoidable impurity, including MnO, TiO 2 , CaO, FeO, where MnO≤0.2%, TiO 2 ≤0.2%, CaO≤0.1%, FeO≤0.3%, configured as an electroslag heavy melting slag system with a total weight of 6kg.

[0032] 3) Electroslag remelting

[0033] Mix the prepared electroslag remelting slag evenly, bake it at 800°C for 4 hours, use a graphite electrode rod to...

Embodiment 2

[0037] 1) Preparation of self-fusing electrode rod

[0038] Take the components in Table 2, with a total weight of 31kg, and prepare a GH3536 superalloy self-fusing electrode rod with a diameter of φ100mm by vacuum induction melting and casting.

[0039] Table 2 GH3536 superalloy composition ratio wt%

[0040] C Si mn Mo Cr W co Fe Ni 0.098 0.15 0.17 8.74 21.20 0.69 1.56 18.43 margin

[0041] 2) Configure electroslag remelting slag system

[0042] Weigh CaF 2 4.44kg, Al 2 o3 0.90kg, MgO0.6kg, SiO 2 0.06kg, of which the impurity content is less than 1.0%, and the impurity is unavoidable impurity, including MnO, TiO 2 , CaO, FeO, where MnO≤0.2%, TiO 2 ≤0.2%, CaO≤0.1%, FeO≤0.3%, configured as an electroslag heavy melting slag system with a total weight of 6kg.

[0043] 3) Electroslag remelting

[0044] Mix the prepared electroslag remelting slag evenly, bake it at 800°C for 4 hours, use a graphite electrode rod to melt the slag, and...

Embodiment 3

[0048] 1) Preparation of self-fusing electrode rod

[0049] Take the components in Table 3, with a total weight of 31kg, and prepare a GH3536 superalloy self-fusing electrode rod with a diameter of φ100mm by vacuum induction melting and casting.

[0050] Table 3 GH3536 superalloy composition ratio wt%

[0051] C Si mn Mo Cr W co Fe Ni 0.098 0.15 0.17 8.74 21.20 0.69 1.56 18.43 margin

[0052] 2) Configure electroslag remelting slag system

[0053] Weigh CaF 2 4.32kg, Al 2 o 3 1.08kg, MgO 0.6kg, SiO 2 0kg, the impurity content is less than 1.0%, and the impurity is unavoidable impurity, including MnO, TiO 2 , CaO, FeO, where MnO≤0.2%, TiO 2 ≤0.2%, CaO≤0.1%, FeO≤0.3%, configured as an electroslag heavy melting slag system with a total weight of 6kg.

[0054] 3) Electroslag remelting

[0055] Mix the prepared electroslag remelting slag evenly, bake it at 800°C for 4 hours, use a graphite electrode rod to melt the slag, and pour it ...

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Abstract

Provided is a nickel-based superalloy electroslag remelting slag system. The slag system is prepared from, by weight, 65%-75% of CaF2, 15%-25% of Al2O3, 5%-19% of MgO and 0-5% of SiO2. The total quantity of impurities is smaller than 1.0%. When the slag system is used for carrying out electroslag remelting on nickel-based superalloy, a steel ingot obtained through remelting is low in oxygen content and small in non-metal occluded foreign substance quantity, the surface and interior quality of the electroslag remelting steel ingot can be effectively improved, and the subsequent machinable property of electroslag remelting steel ingot can be enhanced.

Description

technical field [0001] The invention relates to the field of nickel-based high-temperature alloy smelting, in particular to a nickel-based high-temperature alloy electroslag remelting slag system. Background technique [0002] Nickel-based superalloys are superalloys with nickel as the matrix (generally more than 50%) in the range of 650-1000 °C with high strength and good oxidation resistance and gas corrosion resistance. [0003] Electroslag remelting is a method of smelting using the resistance heat generated when the current passes through the slag as a heat source. The electroslag remelting process can purify metals and obtain electroslag remelted steel ingots with uniform and dense clean structure. The electroslag remelted alloy has high purity, low sulfur content, less non-metallic inclusions, smooth surface of the alloy ingot, clean, uniform and dense, uniform metallographic structure and chemical composition. The selection of electroslag remelting slag system and ...

Claims

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Application Information

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IPC IPC(8): C22B9/18C22C30/00
CPCC22B9/18C22C19/055C22C30/00
Inventor 王宏张十庆张登友刘洋罗炯邹兴政何钦生杨百炼赵安中李方唐锐王东哲刘庆宾
Owner CHONGQING MATERIALS RES INST
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