摘要
Addition of rare earth(RE)such as Y in the surface layer of gray cast iron or Ni-based superalloy by laser sutface melting was carried out using a 2 k W CO_2 laser.For delivering the element Y to the metal surface dur- ing laser irradiation,several methods were employed.It is found that Y-containing surface modified layer can he controllably obtained on substrates,a gray cast iron can be laser surface-modified with Cr+Al-Y powder re- sulting in a thin layer of Fe-Cr-Al-Y alloy such as 30Fe40Cr27Al3Y.
Addition of rare earth(RE)such as Y in the surface layer of gray cast iron or Ni-based superalloy by laser sutface melting was carried out using a 2 k W CO_2 laser.For delivering the element Y to the metal surface dur- ing laser irradiation,several methods were employed.It is found that Y-containing surface modified layer can he controllably obtained on substrates,a gray cast iron can be laser surface-modified with Cr+Al-Y powder re- sulting in a thin layer of Fe-Cr-Al-Y alloy such as 30Fe40Cr27Al3Y.
基金
Project supported by the National Natural Science Foundation of China
