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

查看全文 作　　者：Xudong [1,2]Du;Feng [1,2]Wang;Zhi [1,2]Wang;Xingxing [1,2]Li;Zheng [1,2]Liu;Pingli [1,2]Mao 高影响力作者 机构地区：[1]College of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;[2]Key Laboratory of Magnesium Alloys and the Processing Technology of Liaoning Province,Shenyang 110870,China高影响力机构 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2020年第33卷第9期,共12页高影响力期刊 基　　金：the LiaoNing Revitalization Talents Program(No.XLYC1807021);the Innovation Talent Program in Sciences and Technologies for Young and Middle-aged Scientists of Shenyang(No.RC180111);the Doctoral Scientific Research Foundation of Liaoning Province(No.51504153)。 摘　　要：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. 关 键 词：AXJ530 alloy Hot tearing susceptibility Alternating magnetic field MICROSTRUCTURE
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