The inclusion removal behavior during electron beam smelting of DD98M alloy

The DD98M alloy was prepared by electron beam smelting, and the effect of electron beam smelting parameters on the inclusion removal behavior was studied. The inclusion removal thermodynamics and kinetic mechanisms were analyzed. The results show that the O and N in the DD98M alloy can be reduced by...

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Bibliographic Details
Published in:Journal of materials research and technology 2022-09, Vol.20, p.4297-4305
Main Authors: Dong, Gengyi, You, Xiaogang, Dong, Liyang, Yiliti, Yijiala, Xu, Zhaohui, Zhou, Haijing, Wang, Yinong, Tan, Yi
Format: Article
Language:English
Subjects:
DD98M alloy
Electron beam smelting
Inclusion removal
Kinetics
Thermodynamics
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Summary:The DD98M alloy was prepared by electron beam smelting, and the effect of electron beam smelting parameters on the inclusion removal behavior was studied. The inclusion removal thermodynamics and kinetic mechanisms were analyzed. The results show that the O and N in the DD98M alloy can be reduced by 92.5% and 88.4% when smelted for 30 min with power of 12 kW, and no obvious inclusions are found in the microstructures. Increasing the smelting power or prolonging the smelting time will promote the removal of inclusion effectively. The inclusions are concentrated in the central area of the electron beam under the combined action of buoyancy and Marangoni effect. The inclusions in the near-surface area of the melt can be removed by dissolution, and the inclusion particles floating above the melt level can be decomposed under the action of electron beam bombardment.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2022.09.007