Effects of Pulsed Magneto-Oscillation on the Homogeneity of Low Carbon Alloy Steel Continuous Casting Round Billet

Abstract

Pulsed Magneto-Oscillation (PMO) is a newly developed and effective homogenization technique, and has been successfully applied in rectangular continuous casting, but its processing parameters and effective stability in round billet continuous casting have not been investigated. In this paper, the effects of PMO on the solidification structure and the macrosegregation of Φ 178 mm continuous casting round billets for low carbon alloy steel were studied by industrial experiments. The results show that PMO can stably increase the equiaxed grain area, and reduce the macrosegregation of billets. Moreover, it has strong adaptability to steel grade and continuous casting process parameters. Compared with the billets without PMO treatment, for 93.8% of billets (15 billets) solidified with PMO, the equiaxed grain area ratio increased by an average of 5.8%, while for 87.5% of billets (14 billets), the carbon segregation index range decreased by an average of 0.06, though different steel grades, superheat and casting speed were used in the experiment. It is believed that convection caused by Lorentz force can accelerate the heat dissipation of steel liquid, and reduce the temperature of a liquid at the solidification front, while the magnetic oscillation effect is conducive to dendrite fragmentation. Both effects lead to refinement of the solidification structure and reduction of macrosegregation.

Effect of Alloying and Microalloying Elements on Carbides of High-Speed Steel: An Overview

“…Optimizing the electroslag casting process to improve the carbide's shape and size and refine the solidified microstructure will be essential to enhance this technology. The physical field represented by electromagnetic stirring and pulse magneto-oscillation has made remarkable achievements in improving the quality of metallurgical billets [103][104][105][106][107][108][109][110][111]. These technologies, especially pulse magneto-oscillation solidification homogenization technology, show greater advantages in low-cost, large-scale, high-speed steel metallurgical manufacturing.…”

Optimization of Process Parameters for 40Cr Steel Continuous Casting Round Bloom with Pulsed Magneto‐Oscillation Treatment

“…Recently, PMO has been applied to the square and rectangular continuous casting billets. [20][21][22] However, the influence of PMO on the solidification process of the bloom is unclear.…”

Evolution of Electromagnetic Fields and Forced Flow in a Metal Melt under the Impact of Hot‐Top Pulsed Magneto‐Oscillation

“…[22][23][24][25] Recently, PMO has found commercial applications in inducing grain refinement and reducing macro-segregation in continuous casting steel billets. [26,27] Furthermore, variants like surface pulsed magnetooscillation (SPMO) [28,29] and hot-top pulsed magneto-oscillation (HPMO) [30][31][32][33][34][35][36] have been developed to enhance the solidified structures in large steel ingots. A comprehensive study by Zhao et al [29][30][31]34] compared SPMO and HPMO, considering factors like coil position, electromagnetic fields, and flow distribution's impact on grain size.…”