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Electroslag remelting method for nickel-based superalloy

A nickel-based superalloy and electroslag remelting technology, applied in the field of metallurgy, can solve the problems of uneven composition, unstable composition of electroslag metallurgy, poor high temperature strength and structural stability of domestic superalloys, etc. The effect of reducing the supercooling of components and improving the heat transfer efficiency

Pending Publication Date: 2022-01-28
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic aero-generator guide blades, turbine blades, turbine disks, combustion chambers, rocket engine turbine disks, shaft parts, air intake ducts, nozzles, turbine blades and guide blades of gas turbines with a temperature of 600Mpa and above are basically complete. Relying on imports, domestic superalloys are only used in some civilian fields, such as exhaust gas turbochargers for diesel engines and gasoline engines, and flue gas turbines for petroleum catalytic cracking units. This is due to the unevenness and instability of the quality of electroslag metallurgy, especially the composition of the structure

Method used

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  • Electroslag remelting method for nickel-based superalloy
  • Electroslag remelting method for nickel-based superalloy
  • Electroslag remelting method for nickel-based superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The electroslag remelting consumable electrode in this embodiment is a nickel-based superalloy with a specification of Φ120×1500mm, and its composition is: C 0.1%, Si 0.03%, Mn 0.04%, P 0.012%, S 0.005%, Cr 17%, Mo 3.3%, Ni 50%, Ti 1.15%, Al 0.2%, Nb 4.75%, the balance is iron and unavoidable impurities. The size of the crystallizer is Φ150×600mm, and a Co60 liquid level detection device and a stirring coil are built in at a distance of 200-400mm from the upper edge of the crystallizer. Carry out electroslag remelting according to the following steps:

[0035] (1) η=Al / Ti=0.2 / 1.15=0.174,

[0036]

[0037] Calculate the Al in the slag system according to the above formula 2 o 3 、TiO 2 The weight contents of the slag are 23.6% and 4.9%, respectively, and the weight contents of other components of the slag system are respectively CaF 2 : 55%, CaO: 16.5%;

[0038] Mixed CaF 2-CaO-Al 2 o 3 -TiO 2 5kg of slag is energized and melted. After melting, the temperatur...

Embodiment 2

[0051] The electroslag remelting self-consumable electrode in this embodiment is a nickel-based superalloy with a specification of Φ210×1800 mm, and its composition is: C0.08%, Si 0.025%, Mn 0.035%, P 0.015%, S 0.005%, Cr 19%, Mo 3% , Ni 52%, Ti0.65%, Al 1.25%, Nb 5.05%, and the balance is iron and unavoidable impurities. The size of the crystallizer is Φ300×700mm, and a Co60 liquid level detection device and a stirring coil are built in at a distance of 200-400mm from the upper edge of the crystallizer. Carry out electroslag remelting according to the following steps:

[0052] (1) η=Al / Ti=1.25 / 0.65=1.92,

[0053]

[0054] Calculate the Al in the slag system according to the above formula 2 o 3 、TiO 2 The weight content of the slag is 36%, 4.5%, respectively, and the weight content of other components of the slag system is CaF 2 : 44.5%, CaO: 15%;

[0055] Mixed CaF 2 -CaO-Al 2 o 3 -TiO 2 30kg of slag is energized and melted. After melting, the temperature is rais...

Embodiment 3

[0068] The electroslag remelting self-consumable electrode in this embodiment is a nickel-based superalloy with a specification of Φ300×2000 mm, and its composition is: C0.06%, Si 0.035%, Mn 0.035%, P 0.005%, S 0.008, Cr 21%, Mo 2.8%, Ni 55%, Ti 1.05%, Al 1.95%, Nb 5.55%, and the balance is iron and unavoidable impurities. The size of the crystallizer is Φ400×850mm, and a Co60 liquid level detection device and a stirring coil are built in at a distance of 200-400mm from the upper edge of the crystallizer. Carry out electroslag remelting according to the following steps:

[0069] (1) η=Al / Ti=1.95 / 1.05=1.86,

[0070]

[0071] Calculate the Al in the slag system according to the above formula 2 o 3 、TiO 2 The weight contents of the slag are 35.6% and 4.55%, respectively, and the weight contents of other components of the slag system are respectively CaF 2 : 30%, CaO: 30%;

[0072] Mixed CaF 2 -CaO-Al 2 o 3 -TiO 2 50kg of slag is energized and melted. After melting, t...

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Abstract

The invention discloses an electroslag remelting method of a nickel-based superalloy. The contents of Al2O3 and TiO2 in an electroslag system are designed according to the ratio of aluminum to titanium in the nickel-based superalloy, the reaction process that liquid drops penetrate through a slag bath in the remelting process is effectively inhibited, and the yield of aluminum and titanium can be stably kept to be more than 95%; in the electroslag remelting process, an ingot pulling type crystallizer is adopted, a Co60 liquid level detection device is used for positioning a metal molten pool, an electromagnetic stirring power source is turned on when the 50-100 mm range of the tail end of the metal molten pool is completely located in an electromagnetic stirring coil area, component supercooling is relieved, element segregation is reduced, a heat transfer mode is converted, and the heat transfer efficiency is improved; and the macrosegregation index of main elements such as Nb, Cr, Ni, Al and Ti in an electroslag ingot is 0.95-1.05, and the secondary dendritic crystal spacing is reduced by 30-40% compared with that of traditional electroslag.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to an electroslag remelting method, in particular to an electroslag remelting method for a nickel-based superalloy. Background technique [0002] Nickel-based superalloys have excellent performance and are widely used in aerospace, electric power, shipbuilding, petrochemical and other fields. The alloy has a certain durability strength, creep strength, thermal fatigue strength and toughness at a working temperature of 600-1000 ° C, and also has strong oxidation resistance and corrosion resistance. The alloy has a single stable γ solid solution structure. Under large temperature changes, the structure basically does not change, which provides a guarantee for the safe use of alloy parts. [0003] The production of superalloys generally has two processes: vacuum induction melting + electroslag remelting, vacuum induction melting + vacuum self-consumption, among which the output of su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22C1/02C22C19/05B22D11/00B22D11/115B22D2/00
CPCC22B9/18C22C1/023C22C19/055C22C19/056B22D11/001B22D11/115B22D2/00Y02P10/25
Inventor 张福利侯自兵李瑞杰曹江海齐紫阳张灿王博祥
Owner CHONGQING UNIV
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