Pre-melted slag for electroslag remelting to improve the purity of gh4169 alloy return material and its preparation method

Abstract

The invention belongs to the technical field of pure smelting of high-temperature alloys, and relates to a pre-melted slag for electroslag remelting and a preparation method for improving the purity of GH4169 alloy returned materials; the composition ratio range of the pre-melted slag of the present invention is: (CaF 2 (40~55%)+CaO(20~25%)+Al 2 o 3 (18~22%)+MgO(3~6%)+TiO 2 (2~3%)+MgF 2 (1~2%), the moisture in the pre-melted slag at 600℃≤0.06%; SiO 2 ≤0.5%; C≤0.03%; P≤0.01%; S≤0.005%. The batched ceramic materials are mixed by ball milling, smelted in an electric arc furnace, rapidly cooled, crushed and screened, then dried at a high temperature of 950°C±20°C for 2 to 3 hours, and finally sealed and packaged under the protection of an inert gas (Ar). . The pre-melted slag proposed by the invention can ensure the internal metallurgical quality and surface quality of the GH4169 alloy return ingot for aero-engines, has high alloy purity, has the advantages of energy saving and environmental protection, and has broad market prospects and application values.

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