Investigation of the Oxidation Behaviour of Ti and Al in Inconel 718 Superalloy During Electroslag Remelting

被引:43
作者
Duan, Shengchao [1 ,2 ]
Shi, Xiao [1 ,2 ]
Mao, Mingtao [1 ,3 ]
Yang, Wensheng [1 ,2 ]
Han, Shaowei [1 ,2 ]
Guo, Hanjie [1 ,2 ]
Guo, Jing [1 ,2 ]
机构
[1] Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
[2] Beijing Key Lab Special Melting & Preparat High E, Beijing 100083, Peoples R China
[3] CISRI, Res Inst High Temp Mat, Beijing 100081, Peoples R China
来源
SCIENTIFIC REPORTS | 2018年 / 8卷
基金
中国国家自然科学基金;
关键词
THERMODYNAMIC PROPERTIES; ALLOYING ELEMENTS; TITANIUM; SLAG; ALUMINUM; SILICON; DEOXIDATION; INCLUSION; MANGANESE; AEROSPACE;
D O I
10.1038/s41598-018-23556-3
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In the current study, the thermodynamics of the slag-metal equilibrium reaction between Inconel 718 Ni-based alloy and CaF2-CaO-Al2O3-MgO-TiO2 electroslag remelting (ESR)-type slags were systematically investigated in the temperature range from 1773 to 1973 K (1500 to 1700 degrees C). The equilibrium Al content increased with increasing temperature, whereas the equilibrium Ti content decreased with increasing temperature at a fixed slag composition. The important factors for controlling the oxidation of Al and Ti in the Inconel 718 superalloy were TiO2 > Al2O3 > CaO > CaF2 > MgO in ESR-type slag and Al > Ti in a consumable electrode. The conventional method of sampling by means of a quartz tube could result in contamination of the molten metal and changes in the size of the "special reaction interface". Therefore, a novel method was used in the present study to investigate the slag-metal reaction kinetics to accurately obtain the kinetic parameters. The mass transfer coefficient was determined by coupling with the kinetic model derived from the assumption that the reaction rate ([Al] + (TiO2) = [Ti] + (Al2O3)) was controlled by the mass transfer of [Ti], [Al], (TiO2) and (Al2O3) in the boundary layer, respectively.
引用
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页数:14
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