Nickel-chromium intermediate alloy and preparation method thereof

Abstract

The invention relates to a nickel-chromium intermediate alloy and a preparation method thereof, and belongs to the technical field of alloy smelting. The nickel-chromium intermediate alloy comprises the following components of, in percentage by weight, 68-72% of Cr, Si smaller than or equal to 0.2%, Al smaller than or equal to 0.1%, Fe smaller than or equal to 0.2%, C smaller than or equal to 0.05%, Cu smaller than or equal to 0.002%, S smaller than or equal to 0.0015%, P smaller than or equal to 0.0025%, O smaller than or equal to 0.005%, N smaller than or equal to 0.005%, Sb smaller than or equal to 10 ppm, Sn smaller than or equal to 5 ppm, Bi smaller than or equal to 5 ppm, Pb smaller than or equal to 5 ppm, As smaller than or equal to 10 ppm and the balance Ni. The method has the beneficial effects that the obtained nickel-chromium intermediate alloy is good in consistency, and the stability requirement of nickel-chromium-based alloy smelting raw materials is fully met.

Description

technical field [0001] The invention relates to a nickel-chromium master alloy and a preparation method thereof, belonging to the technical field of alloy smelting. Background technique [0002] Superalloys (superalloys) are used in the hot end parts of aero-engines or gas engines, and are key core materials. The quality stability of domestic superalloys is not as good as that of foreign advanced enterprise products, especially in terms of long-term service life. Most superalloys contain a higher content of elemental chromium to improve oxidation resistance. Generally, electrolytic chromium or thermite chromium is used to add chromium, but because of their high oxygen and nitrogen content or the presence of more oxygen and nitrogen compound inclusions, it is difficult to remove during the smelting process of superalloys, which will endanger the purity and stability of superalloys. The production of some high-end single crystal nickel-chromium-based superalloy materials in C...

AI Technical Summary

Problems solved by technology

The root cause of poor stability in cast nickel-chromium-based alloys (cast superalloys): no accurate and convenient detection method for the detection of inclusion levels

For example: the "electron beam button ingot sample method" is adopted abroad, and the "alloy induction melting scum detection method" is used domestically. These are observations after the sample is melted, and the area or coating of inclusions on the surface of the button ingot after cooling is observed. The scum on the surface of the melt is used to determine the inclusion content of the material during induction melting. These methods have their own shortcomings, such as: the process is complicated and costly, it is a destructive test, and the representativeness is not good. It is affected by the sampling location and method, and is affected by The influence of crucible and melting environment, etc.

Images