Electroslag remelting premelted slag for improving purity of GH4169 alloy return scraps and preparing method

Abstract

The invention belongs to the technical field of high-temperature alloy purifying smelting and relates to an electroslag remelting premelted slag for improving the purity of GH4169 alloy return scrapsand a preparing method. According to the ranges of composition proportions of the premelted slag, CaF2 accounts for 40-55%, CaO accounts for 20-25%, Al2O3 accounts for 18-22%, MgO accounts for 3-6%, TiO2 accounts for 2-3%, and MgF2 accounts for 1-2%; and in the premelted slag at 600 DEG C or lower, moisture is smaller than or equal to 0.06%, SiO2 is smaller than or equal to 0.5%, C is smaller thanor equal to 0.03%, P is smaller than or equal to 0.01%, and S is smaller than or equal to 0.005%. Prepared ceramic materials are subjected to ball milling mixing, smelting through an electric arc furnace, quick cooling and crushing screening, then dried for 2-3 h at the high temperature of 950 DEG C +/-20 DEG C and finally sealed and packaged under the protection of the inert gas (Ar). The premelted slag can ensure the internal metallurgical quality and the surface quality of GH4169 alloy return scrap ingots for aircraft engines, the alloy purity is high, and the premelted slag has the advantages of energy conservation and environmental friendliness, and has wide market prospects and application value.

Description

technical field [0001] The invention belongs to the technical field of pure smelting of high-temperature alloys, and relates to pre-melted slag for electroslag remelting and a preparation method thereof for improving the purity of GH4169 alloy returned materials. Background technique [0002] The background technology of this project is high-temperature alloy electroslag remelting technology and high-temperature alloy return material recovery and reuse technology. [0003] With the rapid development of my country's aerospace, gas turbine, nuclear power and other industries, the use of superalloy materials is increasing. However, superalloy parts have many processing procedures, long manufacturing process, and low material utilization rate. For example, the weight of superalloy final parts is usually only 30% of the total weight of the original input metal materials (weight percentage, the same below), and even some are only about 10% %, the rest are in the form of scraps su...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems of low utilization rate and high production cost of high-quality deformed superalloy GH4169 used in the field of aero-engines, the present invention proposes a pre-melted slag composition and preparation method for electroslag remelting that improves the purity of GH4169 returned materials, which will help To improve the metallurgical quality level and performance stability of deformed superalloys in my country, and meet the needs of reducing costs and improving purity in the field of superalloy return materials