Effect of Transverse Static Magnetic Field on Droplets Transient and Inclusions Evolution During the Electroslag Remelting Process of GCr15 Ingots

doi:10.1007/s40195-018-0801-x

Abstract

Abstract:

The voltage was recorded to investigate the influence of the static magnetic field on droplet evolution during the magnetically controlled electroslag remelting (MC-ESR) process. MC-ESR experiments were carried out under different remelting current, and transverse static magnetic fields (TSMF) of 85 mT, 130 mT and 160 mT were superimposed. Statistical work was performed to obtain the quantitative data of the droplets. The ASPEX Explorer was utilized to investigate the inclusions evolution of GCr15 ingots. The number of the droplets was 31 in 20 s during the traditional ESR process and reached 50 and 51 under the MC-ESR process with the TSMF of 85 mT and 130 mT, respectively. When compared the traditional ESR process with the MC-ESR process, the inclusions amount reduced 67%.

Key words: Electroslag remelting, Static magnetic field, Droplet transient, Inclusions evolution, Electromagnetic vibration effect

Qiang Li, Yun-Bo Zhong, Chu-Xiong Sun, Huai Wang, Tian-Xiang Zheng, Wei-Li Ren, Zhong-Ming Ren. Effect of Transverse Static Magnetic Field on Droplets Transient and Inclusions Evolution During the Electroslag Remelting Process of GCr15 Ingots[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(12): 1311-1316.

Figures/Tables 11

Fig. 1 a Schematic view of the ESR process under a static magnetic field (1—consumable electrode, 2—water-cool mold, 3—permanent magnets, 4—slag pool, 5—droplet, 6—metal pool, 7—ingot, 8—bottom cooper electrode), b MC-ESR GCr15 ingot

Table 1 Chemical composition of the consumable electrode used in experiments (wt%)

C	Si	Mn	S	P	Cr	Al
0.980	0.025	0.367	0.011	0.032	1.39	0.023

Table 2 Remelting current and intensities of the TSMF conditions in experiments

Remelting current intensities (A)	Intensities of the external TSMF (mT)
400, 500, 600, 700 and 800	0, 85, 130 and 160

Fig. 2 Peak value of the voltage data during the ESR process

Fig. 3 a Visualization of the droplet transient, b peak value of the voltage during the ESR process

Fig. 4 Number of the droplets under different remelting current intensities

Fig. 5 Voltage data in 20 s during the MC-ESR process: a 0 mT, b 85 mT, c 130 mT, d 160 mT

Fig. 6 Number of droplets under different intensities of TSMF

Fig. 7 Influence of TSMF on phosphorus (P) content of MC-ESR ingot with different intensities of AC

Fig. 8 Influence of TSMF on inclusion count of MC-ESR ingot

Fig. 9 Schematic view of MC-ESR

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