A method for preparing superalloys by electron beam layered solidification technology

Abstract

The invention discloses a method for preparing a high-temperature alloy through an electron beam layer covering type solidification technology. The method comprises the following steps that an ingot casting obtained through VIM melting is cut into slices; cut traces, oil contamination, impurities and defects on the surfaces of the sheet raw materials are removed; one sheet raw material is arranged in a water-cooling copper crucible of an electron beam smelting furnace, and the rest is arranged on a charging mechanism; a furnace door is closed, vacuum pre-pumping and pumping high vacuum are carried out on a smelting chamber; and after a lamp filament is preheated, electron beam refining is carried out. According to the high-temperature alloy ingot prepared through the method, while reducing the contents of carbon, nitrogen, phosphorus, oxygen and other microelements in the alloy, macrosegregation can be effectively controlled; and the yield of the high-temperature alloy prepared through the technology is increased to 85%-90% from 70% or less of a traditional method, and developed equipment can achieve engineering preparation of large alloy ingots. The method is expected to become a high-temperature alloy duplex melting means which is short in procedure, high in purity, low in segregation and high in yield by combining the VIM process.

Description

technical field [0001] The invention relates to a method for preparing an alloy, in particular to a method for preparing a superalloy by electron beam layering solidification technology. Background technique [0002] At present, the domestic high-temperature alloy preparation technology is based on vacuum induction melting (VIM), combined with vacuum autoconsumption (VAR) technology and electroslag remelting (ESR) technology, using a dual melting process (VIM+VAR or VIM+ESR) ) or triple smelting process (VIM+ESR+VAR) to prepare superalloy ingots, because it is difficult to obtain alloy ingots of high metallurgical quality close to a single smelting method. For example, in the VIM technology, the reaction between the superalloy melt and the crucible refractory will lead to melt contamination, and the obtained ingot has coarse grains, uneven grains, large shrinkage cavities, and serious solidification segregation; ESR technology has low melting and solidification rates. , The...

AI Technical Summary

Problems solved by technology

The triple smelting process can effectively reduce the degree of segregation and the content of oxide inclusions, but the process is too cumbersome

[0004] At present, electron beam melting cannot produce large ingots, and cannot control the macrosegregation of ingots in the direction of solidification within a small range

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