Hot Tearing Susceptibility of AXJ530 Alloy Under Low-Frequency Alternating Magnetic Field

doi:10.1007/s40195-020-01033-z

Abstract

Abstract:

Herein, a hot tearing measured system with external excitation coil and a differential thermal analysis system with applied magnetic field were used to study the effects of low-frequency alternating magnetic field on the solidification behavior and hot tearing susceptibility (HTS) of the AXJ530 alloy under different magnetic field parameters. The hot tearing volume of the castings was measured via paraffin infiltration method. The microstructure of the hot tearing zone of the casting was observed using optical microscopy and scanning electron microscopy, and the phase composition was analyzed using X-ray diffraction and energy depressive spectroscopy. The experimental results show that the solidification interval of AXJ530 alloy was shortened and the dendrite coherency temperature of the alloy decreased with the increase in frequency of alternating magnetic field. Under appropriate magnetic field parameters, the electromagnetic force could enhance the convection in the melt to promote the flow of the residual liquid phase, refine the microstructure, and optimize the feeding channel in the late solidification stage, which reduced the HTS of the alloy. However, when the magnetic field frequency was increased to 15 Hz, the induced current generated excessive Joule heat to the melt. At this time, the thermal action of the magnetic field coarsened the microstructure of the alloy, resulting in an increase in HTS of the alloy.

Key words: AXJ530 alloy, Hot tearing susceptibility, Alternating magnetic field, Microstructure

Xudong Du, Feng Wang, Zhi Wang, Xingxing Li, Zheng Liu, Pingli Mao. Hot Tearing Susceptibility of AXJ530 Alloy Under Low-Frequency Alternating Magnetic Field[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(9): 1259-1270.

Figures/Tables 18

Fig. 1 Hot tearing measured system with applied magnetic field

Fig. 2 Differential thermal analysis experimental system with magnetic field

Fig. 3 Selection and preparation method of the samples

Fig. 4 Hot tearing curves of AXJ530 alloy under different magnetic field conditions: a 0 A, 0 Hz; b 10 A, 5 Hz; c 10 A, 10 Hz, d 10 A, 15 Hz

Fig. 5 Macro-cracks of the casting under different magnetic field conditions: a 0 A, 0 Hz; b 10 A, 5 Hz; c 10 A, 10 Hz, d 10 A, 15 Hz

Fig. 6 Volume of cracks of casting under different magnetic field conditions

Fig. 7 Solidification curves of AXJ530 alloy under different magnetic field conditions: a 0 A, 0 Hz; b 10 A, 5 Hz; c 10 A, 10 Hz, d 10 A, 15 Hz

Fig. 8 XRD spectra of AXJ530 alloy under different magnetic field conditions: a 0 A, 0 Hz; b 10 A, 5 Hz; c 10 A, 10 Hz, d 10 A, 15 Hz

Table 1 Solidification temperature information of AXJ530 alloy

Magnetic field conditions	Liquidus (℃)	Solidus (℃)	ΔT (℃)
0 A, 0 Hz	624	483	141
10 A, 5 Hz	619	481	138
10 A, 10 Hz	608	480	128
10 A, 15 Hz	611	482	129

Fig. 9 DTA curves of AXJ530 alloy under different magnetic field conditions: a 0 A, 0 Hz; b 10 A, 5 Hz; c 10 A, 10 Hz, d 10 A, 15 Hz

Fig. 10 Solidification time-solid fraction curves of AXJ530 alloy

Table 2 Thermal analysis results of AXJ530 alloys under different conditions

Magnetic field conditions	t_0.99 (s)	t_0.9 (s)	t_0.4 (s)	Eutectic phases fraction (%)
0 A, 0 Hz	442.8	338.7	95.2	37.6
10 A, 5 Hz	451.9	351.7	97.6	39.5
10 A, 10 Hz	452.0	367.6	109.9	46.8
10 A, 15 Hz	453.7	365.7	104.2	38.8

Fig. 11 CSCt and Tcoh of AXJ530 alloy under different magnetic fields

Fig. 12 Schematic of the action of alternating magnetic field on the melt at a certain instant

Fig. 13 Microstructures of AXJ530 alloy under different magnetic field conditions: a 0 A, 0 Hz; b 10 A, 5 Hz; c 10 A, 10 Hz, d 10 A, 15 Hz

Fig. 14 Microstructure images near the cracks of AXJ530 alloy under different magnetic field conditions: a 0 A, 0 Hz; b 10 A, 5 Hz; c 10 A, 10 Hz, d 10 A, 15 Hz

Fig. 15 Partially enlarged eutectic phase morphology image a of AXJ530 alloy, b, c their EDS analysis results

Fig. 16 Schematic of the feeding behavior of different microstructures: a natural condition, b magnetic field condition

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