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Method for deoxidization for nickel-based high-temperature alloy

A nickel-based superalloy and matrix technology, applied in metal processing equipment, welding media, welding/cutting media/materials, etc., can solve the problems of increasing element burning loss, increasing inclusion content, etc., to improve mechanical properties and easy process. , the effect of low cost

Inactive Publication Date: 2020-05-08
GUANGDONG UNIV OF PETROCHEMICAL TECH
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Problems solved by technology

[0005] The hazards of oxygen in nickel-based alloys are mainly reflected in: (1) The dissolved oxygen in the alloy melt oxidizes the added alloy elements, increases the burning loss of elements, and increases the content of inclusions

Method used

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Embodiment

[0020] Selected smelting raw materials, including pure iron, Jinchuan nickel, metal chromium, metal molybdenum, metal manganese, niobium and titanium, pickling and rust removal on the surface of pure iron, drying raw materials and adding them to the crucible, steel ingot molds, heat preservation caps and pouring cups at high temperature Dry in the oven. Use ZG-0.025 vacuum induction melting furnace to melt Inconel690 alloy ingots. The process parameters are: vacuum to 0.01Pa, 12kW: 15min; 22kW until melting; vacuum degree 0.1Pa, refining for 10min, electromagnetic stirring; use of carbon in raw materials Carry out pre-deoxidation; reduce the power to 5kW under vacuum to freeze and deflate, then raise the temperature, repeat 3 times; fill high-vacuum with high-purity argon, adjust the temperature, add deoxidizing elements rare earth lanthanum (0.01%) and magnesium (0.01%), electromagnetic After stirring, add microalloying elements aluminum, titanium, niobium and molybdenum and ...

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PUM

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Abstract

The invention discloses a method for deoxidization for a nickel-based high-temperature alloy. The method comprises the following steps: smelting raw materials are selected; an Inconel690 alloy cast ingot is smelted through a ZG-0.025 type vacuum induction smelting furnace, and the process parameters are as follows: vacuumizing is carried out to reach 0.01Pa, and smelting is carried out for 10-20min under 10-15kW, and carried out under 20-25kW until the Inconel690 alloy cast ingot is melted; the vacuum degree is not greater than 0.1Pa, refining is carried out for 10min, and electromagnetic stirring is carried out; the power is reduced to 5kw under a vacuum, freezing deflation is carried out, then heating is carried out, and the process is repeated for 2-3 times; high-purity argon is chargedunder a high vacuum, a temperature is adjusted, deoxidization elements rare-earth lanthanum and magnesium are added, electromagnetic stirring is carried out, then microalloying elements silicon, aluminum, titanium, niobium and molybdenum, and volatile element manganese are added, and the electromagnetic stirring is carried out; and the power is reduced, pouring and cooling are carried out, then the cast ingot is taken out, and a riser is cut off. The cast ingot obtained by the method is compact in internal structure, uniform in chemical component, and free from shrinkage and porosity, and hasan oxygen content of not greater than 10ppm.

Description

technical field [0001] The invention relates to the technical field of deoxidation of nickel-based superalloys, in particular to a deoxidation method comprising vacuum induction smelting + prefabricated magnesia crucible + addition of rare earth lanthanum and magnesium. Background technique [0002] Because of their excellent corrosion resistance and high temperature oxidation resistance, nickel-based alloys are often used in equipment with harsh operating conditions and high safety requirements. With the continuous and rapid development of my country's economy, the equipment manufacturing industry has become a pillar industry of the national economy. The outstanding characteristics of the development of the equipment manufacturing industry are: the parameters of single-machine equipment are getting higher and higher, the conditions of use are becoming more and more stringent, and the requirements for safety are getting higher and higher. come higher. Welding is a key manufa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/06C22C19/05B23K35/30
CPCB23K35/304C22C1/023C22C1/06C22C19/053C22C19/055C22C19/058
Inventor 王吉孝王黎马李莫才颂李柏茹黄敏王君金国
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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