Method for melting nickel-base high temperature alloy with electro-slag furnace
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A technology of nickel-based superalloys and superalloys, which is applied in the field of electroslag furnace smelting nickel-based superalloys, can solve the problems of easy cracking, segregation of steel ingots, poor thermal processing performance, etc. Good results
Inactive Publication Date: 2012-10-10
SHANXI TAIGANG STAINLESS STEEL CO LTD
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[0002] The difficulty of electroslag remelting superalloys is that the alloy in the superalloy is ≥20ppm, the steel ingot segregates seriously, the hot workability is poor, it is easy to crack during forging, the forging yield is ≤ high, and it contains Nb, Ti, Mo and other elements that are easily segregated. Improper selection of electroslag process will cause severe segregation of steel ingots, resulting in defects such as black spots; it contains Al, Ti and other elements that are easy to burn, and the composition deviation of the ingot head and tail is large
At present, the main problem of electroslag remelting superalloys is that slag groove defects appear on the surface of steel ingots, the burning rate of Al and Ti is 10%, the deviation of Al and Ti at the head and tail of electroslag ingots is greater than ±0.08%, and the sulfur content of products is 60%.
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Embodiment 1
[0033] Alloy type: GH4169, Al 0.72% and Ti 0.95% in the electrode.
[0034] Crystallizer size: φ350×1650mm
[0035] The slag is five-element slag: CaF 2 50%, Al 2 o 3 22%, CaO 20%, MgO 5%, TiO 2 3%. Slag volume: 35kg
[0036] Ⅰ charge
[0037] Weld the φ280×2200mm GH4169 electrode with the dummy electrode and connect it with the electrode holder. At the bottom of the crystallizer, place the same material as the arc strike ring, turning chips and 3.5kg of slag.
[0038] Ⅱ inert gas purge
[0039] Close the protective cover, blow in Ar gas to purge the bottom of the furnace, the pressure of argon is 0.3 MPa, and open the smoke exhaust device at the same time to discharge the air in the furnace for 10 minutes.
[0040] Ⅲ protection smelting
[0041] Close the smoke exhaust valve, feed Ar gas into the crystallizer and the protective cover at a flow rate of 10ml / min, and maintain a slight positive pressure (1.05bar) in the protective cover.
[0042] Ⅳ arc slag
...
Embodiment 2
[0053] Alloy type: Al0.70% and Ti0.63% in Inconel690 electrode.
[0054] Crystallizer size: φ290×1650mm
[0055] The slag is ternary slag: CaF2 : 68%, Al 2 o 3 : 17%, CaO: 15%, slag amount 28kg
[0056] Ⅰ charge
[0057] Weld the φ220×1700mm Inconel690 electrode with the dummy electrode and connect it with the electrode holder. At the bottom of the crystallizer, place the same material as the arc ring, turning chips and 2.5kg of slag.
[0058] Ⅱ inert gas purge
[0059] Close the protective cover, blow in Ar gas to purify the bottom of the furnace, the argon pressure is 0.3 MPa, and open the smoke exhaust device at the same time to discharge the air in the furnace for 5 minutes.
[0060] Ⅲ protection smelting
[0061] Close the smoke exhaust valve, feed Ar gas into the crystallizer and the protective cover at a flow rate of 5 l / min, and maintain a slight positive pressure (1.08 bar) in the protective cover.
[0062] Ⅳ arc slag
[0063] The slag melting voltage ...
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Abstract
The invention relates to a method for melting a nickel-base high temperature alloy with an electro-slag furnace. The method includes the following methods: loading materials, welding a high temperature alloy electrode and a false electrode to be smelted together, and placing slag materials at the bottom of a crystallizer; blowing the welded electrodes with inert gases, and closing a protection cover; protecting a smelting closing smoke exhaust valve, and feeding an Ar gas into the crystallizer and the protection cover; striking an arc and melting slag; cleaning smelting slag materials, starting a smelting period, and swinging a slag resistor for less than 0.5 m omega during the smelting process; adding oxidizing agents, and adding metal aluminum powder continuously or at intervals to serve as deoxidizing agents during an electro-slag re-melting process; adopting feeding thorough three stages, power feeding is decreased rapidly, power feeding is decreased slowly, and finally heat is preserved at constant power; and casting a die, cooling and demolding the die. According to the method for melting the nickel-base high temperature alloy with the electro-slag furnace, the surface of a nickel-base high temperature steel ingot has no slag groove defect, and the burning losses of Al and Ti are less than or equal to 5%.
Description
technical field [0001] The invention discloses a method for smelting a nickel-based superalloy in an electroslag furnace. Background technique [0002] The difficulty of electroslag remelting superalloys is that the alloy in the superalloy is ≥20ppm, the steel ingot segregates seriously, the hot workability is poor, it is easy to crack during forging, the forging yield is ≤ high, and it contains Nb, Ti, Mo and other elements that are easily segregated. Improper selection of the electroslag process will cause severe segregation of the steel ingot, resulting in defects such as black spots; it contains Al, Ti and other elements that are easy to burn, and the composition of the ingot head and tail has a large deviation. At present, the main problem of electroslag remelting superalloys is that slag groove defects appear on the surface of steel ingots, the burning rate of Al and Ti is 10%, the deviation of Al and Ti at the head and tail of electroslag ingots is greater than ±0.08%...
Claims
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