Bright layers covering 80% of the melt area have been achieved by laser glazing on Fe C Si B eutectic matrix prealloyed by laser on cast iron substrates. The bright layers appear only when the epitaxial growth from the Fe C Si B eutectic matrix stops abruptly during solidification. It is proved by TEM and HR SEM analyses that the bright layer consists of three sublayers: the upper sublayer is homogeneous nanocrystalline, the middle sublayer is metallic glass, and the lower sublayer is heterogeneous nanocrystalline.