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为研究电磁搅拌对金属凝固组织的影响,在实验室做了一些热模拟试验工作.实验采用旋转型电磁搅拌器.在相似条件下,液态金属在电磁搅拌下凝固与不经电磁搅拌凝固的铸态组织进行对比.同时观察搅拌强度(旋转速度)和搅拌时间对铸态组织的影响.选用铸铁、硅钢、高温合金等作对比试验.试验结果表明,电磁搅拌能消除粗大柱状晶,使晶粒细化,钢中低熔点杂质分布均匀,并能改变铸铁中石墨分布情况,使之呈分散的絮团状分布,并提高其硬度.
In order to study the influence of electromagnetic stirring on the solidification structure of metal, some thermal simulation experiments were done in the laboratory.The rotary electromagnetic stirrer was used in experiment.Under similar conditions, the liquid metal solidified under electromagnetic stirring and the solidified without casting The effects of stirring intensity (rotation speed) and stirring time on the as-cast microstructure were observed.Comparative tests were made on cast iron, silicon steel and superalloy.The experimental results showed that electromagnetic stirring could eliminate the coarse columnar grains, Refining, low melting point impurities in the steel distribution, and can change the distribution of graphite in the cast iron, making it was dispersed flocculent distribution, and increase its hardness.