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脉冲磁场能够有效细化金属凝固晶粒,正逐渐走向工业化应用阶段。针对高品质电工钢、铁素体不锈钢、高速钢以及镍基高温合金等四大类合金容易存在偏析、疏松等凝固问题,提出施加低频脉冲磁场于连铸工业生产过程。计算了低频脉冲磁场施加于连铸足辊段、二冷段和凝固末端,所需临界磁感应强度值分别为0.0845T、0.122T和0.182T。随着低频脉冲磁场施加位置坯壳厚度增加,临界磁感应强度增加,同时调整占空比,可降低临界磁感应强度。
Pulsed magnetic field can effectively refine the metal solidified grains, is gradually moving toward industrial application stage. For the high-quality electrical steel, ferritic stainless steel, high-speed steel and nickel-based superalloy four segregation prone to segregation, porosity and other solidification problems, put forward the application of low-frequency pulsed magnetic field in the continuous casting industrial production process. The critical magnetic flux density values of the low frequency pulsed magnetic field applied to the continuous casting footing section, the secondary cooling section and the solidification tip were calculated as 0.0845T, 0.122T and 0.182T respectively. With the increase of the thickness of the shell, the critical magnetic flux density increases, while the duty cycle is adjusted, the critical magnetic flux density can be reduced.