研究球墨铸铁、灰铸铁和可锻铸铁激光熔融处理后存在于熔化区和半熔化区的残存石墨（即球状、片状和团絮状石墨）周围的双壳层组织．同时指出，在近灰铸铁激光熔池的相变硬化区中片状石墨周围马氏体量的不均匀分布情况。最后，提出了形成这些组织的机制。 The ductile iron, gray cast iron and malleable cast iron were melted and the bilayer structure around the remaining graphite (ie, spherical, flaky and flocculent graphite) existing in the melting zone and semi-melting zone was studied. At the same time, it is pointed out that there is an inhomogeneous distribution of martensite around flake graphite in the phase transformation hardening zone near the laser cladding. Finally, the mechanism for forming these organizations is proposed.