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Fabrication of High-Strength Gray Cast Iron Using Permanent Magnet Scrap

Park S.-Y., Kim J. H., Seo S. J., On J. S., Lim K. M.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 2B

1113--1117

In this study, we have developed the manufacturing technology for high strength gray cast irons by using the spent permanent magnet scraps. The cast specimen inoculated by using a spent magnet scraps showed the excellent tensile strength up to 306MPa. This tensile strength value is 50MPa higher than that of the specimen cast without inoculation, and is similar to that of the specimen inoculated by using the expensive misch-metal. These superior mechanical properties are attributed to complex sulfides created during solidification that promote the formation and growth of Type-A graphite. It is therefore concluded that spent magnets scrap can provide an efficient and cost-effective inoculation agent for the fabrication of high-performance gray cast iron.