Supercooled IN718 high-temperature alloy purifying agent and preparation method for same

Abstract

The invention discloses a supercooled IN718 high-temperature alloy purifying agent and a preparation method for the same. The preparation method includes: sufficiently mixing 45-55 parts of CaF2 (calcium fluoride), 8-12 parts of NaCl (sodium chloride), 8-12 parts of KCl (potassium chloride), 18-22 parts of CaO (calcium oxide), 4-6 parts of TiO2 (titanium dioxide), 4-6 parts of MgO (magnesium oxide) and 0.5-1.0 part of AlF3 (aluminum fluoride) to obtain mixed powder; heating the mixed powder to 800 DEG C and then preserving heat for 8 hours; naturally cooling the mixed powder to room temperature after heat preservation; and milling the mixture into powder after crushing the mixture, and adding 0.5-1.0 part of rare earth compound LaCl3 (lanthanum chloride) to obtain the purifying agent. The purifying agent can integrate the functions of overwrite protection, oxidation and volatilization prevention and impurity removal, components of the purifying agent are easy to obtain, the purifying agent is convenient to add, the operating process is simple, and the cost is low.

Description

technical field [0001] The invention relates to a purifier and a preparation method thereof, which is specially used for the supercooling and purification research of IN718 nickel-based superalloy, and belongs to the technical field of metal materials and metallurgy. Background technique [0002] As an advanced material preparation and processing technology, deep subcooling and rapid solidification can reduce the degree of structure segregation, homogenize the composition, and significantly refine the grains. Finding an effective purging agent to remove the heterogeneous core in the melt or inhibit the heterogeneous nucleation of the heterogeneous core to obtain a large degree of supercooling is the key to the study of deep supercooling. [0003] In recent years, the research on deep supercooled rapid solidification of large volume liquid metals has been very active, and great progress has been made, but there are still the following problems: [0004] (1) The research on d...

AI Technical Summary

Problems solved by technology

Using the existing composite molten salt purifier, such as the literature "Purification Influencing Factors and Approaches of Supercooled DD3 Single Crystal Superalloy" (Liu Feng, Cai Yu, etc., Casting, 2000, 49 (6)) and "DZ125 Alloy Purification Preparation of agent and principle of deep supercooling” (Xie Faqin, Zhou Jun, etc., Thermal Processing Technology, 2009, 38), it is difficult to obtain a large degree of supercooling for the IN718 superalloy

Therefore, it is impossible to carry out research on the microstructure evolution of the IN718 superalloy within a wide range of subcooling, and it cannot meet the requirements of deep supercooling and rapid directional solidification.

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