In recent years, the method of adding rare earth elements to Die-Casting Tooling Design surface strengthening has been widely praised. This is because rare earth elements have many functions [13], such as improving the permeability rate, strengthening the surface and purifying the surface, etc., which have a great impact on the improvement of the mold surface structure, physical, chemical and mechanical properties of the surface, and can improve the permeability rate, strengthening the surface and forming rare earth compounds. At the same time, it can eliminate the harmful effect of trace impurities on grain boundary, and strengthen and stabilize grain boundary on mold cavity surface. In addition, rare earth elements interact with harmful elements in steel to form compounds with high melting point, which can inhibit the segregation of these harmful elements on grain boundary, thus reducing the brittleness in deep layer. In die casting die surface strengthening process adding rare
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