Numerical simulation of carbon-oxygen reaction in vacuum induction melting of nickel-based superalloys
YUAN Yi1, YANG Shu-feng1,2, LIU Wei1, GAO Jin-guo1, QU Jing-long3, ZHANG Ming3
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology, Beijing 100083, China; 3. Beijing CISRI-GAONA Materials and Technology Co., Ltd., Beijing 100083, China
Abstract：In order to investigate the kinetics law of carbon-oxygen reaction during vacuum induction melting(VIM) of nickel-based superalloys, vacuum induction melting deoxygenation kinetic model considering the effects of electromagnetic stirring and crucible decomposition was established based on the multi-physical field coupling technique of electromagnetic field-flow field-solute field, and the effects of current intensity, pressure and refining temperature on the deoxidation reaction of nickel-based superalloy melt were studied. The results show that the simulated variation pattern of oxygen content in melt pool with time agrees well with the experimental results. Electromagnetic stirring accelerates the oxygen transfer rate in the melt bath and had significant effect on the distribution of oxygen in the melt bath. Increasing the current intensity, decreasing the pressure or lowering the refining temperature can effectively promote the melt pool deoxygenation reaction. When the current intensity was increased from 55 A to 75 A, the average oxygen mass fraction of melt pool decreased from 0.001 373% to 0.001 298%. When the pressure was decreased from 1.5 Pa to 0.5 Pa, the average oxygen mass fraction of melt pool decreased from 0.001 960% to 0.001 338%. When the refining temperature was decreased from 1 873 K to 1 773 K, the average oxygen mass fraction of the melt pool decreased from 0.001 855% to 0.001 339%. The obtained results will provide an effective basis for improving the VIM refining process of nickel-based superalloys.
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2023, Vol. 33 
