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A triple smelting process for a nickel-based superalloy gh4698 large-scale ingot

A technology of GH4698 and nickel-based superalloy, which is applied in the field of superalloy smelting, can solve the problems of affecting the high-temperature performance of the alloy, including many inclusions and shrinkage cavities, and poor stability

Active Publication Date: 2020-10-27
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

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Problems solved by technology

There are many inclusions and shrinkage cavities inside the electrode cast by vacuum induction melting, the density of the electrode is poor, the stability is poor during vacuum consumable remelting, the risk of metallurgical defects in the finished ingot is high, and the process produces The ingot has not undergone desulfurization process, and the content of S element in the finished ingot is relatively high, which seriously affects the high temperature performance of the alloy

Method used

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  • A triple smelting process for a nickel-based superalloy gh4698 large-scale ingot
  • A triple smelting process for a nickel-based superalloy gh4698 large-scale ingot
  • A triple smelting process for a nickel-based superalloy gh4698 large-scale ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Vacuum induction melting

[0028] 4288kg of nickel plate, 2.4kg of graphite carbon, 925kg of metal chromium, 186kg of molybdenum bar, and 200kg of nickel-niobium intermediate alloy are cold-feeded in the furnace, and laid in the crucible layer by layer from bottom to top in order, and then the furnace is sealed and evacuated. After 45 minutes, the vacuum degree reaches below 0.25mbar, and start baking with 100kW power for 2 hours;

[0029](10min) → 400kW (15min) → 500kW (25min) → 600kW (maintain) and gradually increase the power in order. After all the materials are melted and enter the first refining period, adjust the power to 500kW. The detected molten steel temperature is 1510°C and the vacuum degree is 0.02mbar, start refining for 2 hours, and carry out electromagnetic stirring at the same time; reduce the power to 50kW, observe conjunctiva on the surface of molten steel in the crucible after 10 minutes, then add 95kg of Al ingot and 155kg of Ti ingot, heat with...

Embodiment 2

[0052] 1) Vacuum induction melting

[0053] 4370kg of nickel plate, 870kg of metal chromium, 3.6kg of graphite carbon, 174kg of molybdenum bar, and 192kg of nickel-niobium intermediate alloy are cold-feeded in the furnace, and laid in the crucible layer by layer in order, and then the furnace is sealed and evacuated. After 57 minutes, the vacuum degree When it reaches below 0.25mbar, start baking with 200kW power for 1h; after baking, press 200kW→220kW(18min)→270kW(10min)→350kW(20min)→

[0054] 420kW (10min) → 550kW (20min) → 700kW (maintain) order to gradually increase the power. After all the materials are melted and enter the first refining period, adjust the power to 650kW. The temperature of the molten steel is 1535°C and the vacuum is 0.04mbar. Start Refining for 2 hours while carrying out electromagnetic stirring; reduce the power to 75kW. After 16 minutes, conjunctiva on the surface of the molten steel in the crucible was observed, then add 105kg of Al ingot and 159kg ...

Embodiment 3

[0077] 1) Vacuum induction melting

[0078] 4420kg of nickel plate, 948kg of metal chromium, 180kg of molybdenum strip, 3.0kg of graphite carbon, and 185kg of nickel-niobium intermediate alloy are cold-feeded in the furnace, and laid in the crucible layer by layer from bottom to top in order, and then the furnace is sealed and evacuated. After 45 minutes, the vacuum degree reaches below 0.25mbar, start baking with 300kW power for 0.5h; after baking, press 300kW→380kW(10min)→420kW(15min)→

[0079] 460kW (10min) → 520kW (15min) → 600kW (25min) → 720kW (maintain) and gradually increase the power in order. After all the materials are melted, enter the first refining period. Adjust the power to 800kW. 0.02mbar, start refining for 2 hours, and carry out electromagnetic stirring at the same time; reduce the power to 100kW, observe the conjunctiva on the surface of the molten steel in the crucible after 10 minutes, then add 90kg of Al ingot and 168kg of Ti ingot, heat with 300kW power...

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Abstract

The invention relates to a novel triple smelting process of a nickel-based high-temperature alloy GH4698 large-scale cast ingot. The smelting process specifically optimizes a traditional process of current GH4698 alloy duplex smelting, and adopts the novel triple smelting process of vacuum induction smelting (VIM), protective atmosphere electroslag smelting (ESR) and vacuum arc smelting (VAR) to produce large-scale cast ingots, protective atmosphere electroslag secondary smelting is added to VIM electrodes, so that S content in finished ingots is greatly reduced, and the stability of subsequent vacuum consumable finished product smelting processes is improved. By adopting the smelting process, the GH4698 alloy large-scale cast ingot with better component uniformity and lower impurity content of elements O, N and S can be obtained.

Description

technical field [0001] The invention belongs to the technical field of superalloy smelting, and in particular relates to a triple smelting process for nickel-based superalloy GH4698 large-size ingot. Background technique [0002] The GH4698 superalloy is a nickel-based superalloy mainly based on the precipitation strengthening of the face-centered cubic γ' phase, supplemented by solid solution strengthening and grain boundary strengthening. The alloy has high strength and toughness, excellent creep performance and good oxidation and corrosion resistance in the temperature range below 750°C, and is widely used in gas turbine disks, deflectors and bearing rings of large ships and warships and other large parts. In order to ensure the uniformity of structure and performance of different parts of large forgings, higher requirements are put forward for the composition uniformity and inclusion content of GH4698 bars produced by metallurgical plants. [0003] At present, domestic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C19/05
CPCC22C1/023C22C1/03C22C19/056
Inventor 史新波阚志李南付宝全曹国鑫
Owner 西安聚能高温合金材料科技有限公司
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