Effects of Electromagnetic Stirring on Cast Structure of High-Carbon High-Speed Steel
Résumé
This thesis focuses on the effect of electromagnetic stirring on the microstructure of casting and morphology of carbides in high carbon and high speed steel for composite roll. The microstructure of casting and morphology of carbides of are studied using the method of metallographic examination, SEM and EDS. The results show that the carbides of high carbon and high speed steel are mainly the MC, M 2 C and M 6 C carbides. MC carbides distributed mainly by granular, M 2 C carbides distributed by strip and massive, and most of the network carbides are M 6 C type carbides. With electromagnetic stirring, carbides distributed mainly on the boundary become to distribute dispersively in the grain and along the boundary. And with the increase of the applied current, distribution of carbides are more uniform. With electromagnetic stirring, at cast center, the main carbides are MC type carbides. With an optimal electromagnetic stirring current intensity, 250A for our casting system, rotary electromagnetic stirring can tend to form MC carbides, break network carbides and reduce the size of carbides.
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