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Method for controlled alloying of intermetallic alloys γ-TiAl with carbon during vacuum induction melting in graphite crucibles
Method for controlled alloying of intermetallic alloys γ-TiAl with carbon during vacuum induction melting in graphite crucibles
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机译：石墨坩埚中真空感应熔炼过程中金属间化合物γ-TiAl与碳的可控合金化方法
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摘要
The invention relates to a process for the controlled alloying of γ-TiAl intermetallic alloys in the range of 0.09 to 0.29 wt. %, characterized in that the γ-TiAl intermetallic alloys with an oxygen content of 0.04 wt. % and a volume of 100 cm3 are melted in a crucible of isostatically pressed graphite with a minimum density of 1.8 g / cm3, a low open porosity 2% and a mean grain size of graphite grains of less than 40 μm, the melting of γ-TiAl alloys being medium-frequency induction furnace with a medium-frequency inductor of 20 to 30 kW and a frequency in the range of 20 to 30 kHz in an argon atmosphere of at least 99,995% purity, with a vacuum in the vacuum chamber of the induction furnace partially filled with argon in the range of 1 to 10 kPa . Heating of the γ-TiAl alloys to the melting point is ensured by gradually increasing the inductor power while maintaining a heating rate of 90 to 100 ° C / min. The total time from the start of melting (first melt hint) to reaching the selected melt overheating temperature is a maximum of 60 s, corresponding to an alloy heating rate ranging from 150 to 200 ° C / min. depending on the selected melt overheating temperature. The melt superheat temperature ranges from 1,650 to 1,700 ° C. The melt stabilization time at the superheat temperature is in the range of 20 to 90 seconds, depending on the desired carbon content in the final cast.
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