Structure and properties of CuCr50 prepared by laser fast remelt

If laser fast remelt technique is used to prepare CuCr50 surface,a 3～5μm fine-grained layer will generate．The layer has less porosity．The hardness of the surface increases nearly one time than that of the matrix and the conductivity changes little．The thickness of the fine-grained layer can be controlled by laser power while the other operation parameters don't change．There is a heat-influenced layer between the fine-grained layer and the matrix,whose properties is between theirs too．Experiments show that laser fast remelt is useful to increase the hardness of CuCr50 contact material.