Effect of slag composition on elements oxidation behavior of GH984G superalloy for electroslag remelting withdrawal process

The composition of a slag system has been shown to be particularly important and influential for the new technology of electroslag remelting withdrawal process. The oxidation of the GH984G alloy elements, in contact with different contents of CaF 2 –CaO–Al 2 O 3 –MgO–TiO 2 –SiO 2 in various slag sys...

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Bibliographic Details
Published inJournal of iron and steel research, international Vol. 29; no. 5; pp. 761 - 771
Main Authors Liu, Fu-bin, Gao, Jun-zhe, Cao, Hai-bo, Li, Hua-bing, Jiang, Zhou-hua, Geng, Xin, Kang, Cong-peng, Chen, Kui, An, Rui-dong
Format Journal Article
LanguageEnglish
Published Singapore Springer Nature Singapore 01.05.2022
Subjects
Applied and Technical Physics
Engineering
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Original Paper
Physical Chemistry
Processes
Viscosity
Slag
GH984G superalloy
Electroslag remelting withdrawal
Oxidation rate
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Summary:The composition of a slag system has been shown to be particularly important and influential for the new technology of electroslag remelting withdrawal process. The oxidation of the GH984G alloy elements, in contact with different contents of CaF 2 –CaO–Al 2 O 3 –MgO–TiO 2 –SiO 2 in various slag systems, has been investigated in the present study by performing slag–metal equilibrium experiments and ion and molecule coexistence theory analysis. The results show that CaF 2 and MgO have only a minor effect on the oxidation rates of Al and Ti in the GH984G superalloys. However, it was found that SiO 2 would intensify the oxidation degree of Al and Ti, and Al was found to become easier oxidized than Ti. Moreover, CaO was found to reduce the activity of SiO 2 and, thereby, also the oxidation degree of Al and Ti. Also, TiO 2 was found to reduce the oxidation rate of Ti and instead increase the oxidation rate of Al. Finally, the effect of Al 2 O 3 on the oxidation of Al and Ti was observed to be opposite to that of TiO 2 . The calculated results were found to be in good agreement with experimental measurements. Moreover, viscosity experiments showed that CaO would rapidly increase the viscosity of the slag at low temperatures, and that the viscosity of the slag would increase with an increase in SiO 2 content.
ISSN:1006-706X
2210-3988
DOI:10.1007/s42243-021-00602-5