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Appropriate laser cladding processing parameters for a Ni-Fe-Cr based alloy coating with good quality were studied using 3.5 kW diode laser.The characterization of the coating was investigated,and the influence of each parameter was analyzed.The mechanical properties and wear resistance of the coating were compared with the corresponding chemical composition wrought and cast materials.The results showed that a coating with aspect ratio about 3,dilution ratio 8%-10%and wetting angle 35o-50°could be formed with the laser power 1200-1500 W,travelling speed 8-10 mm/s,powder feed rate 16-18 g/min and shield gas flow 15 l/min.The tensile strength of the coating reached 953 MPa which was higher than that of wrought material 918 MPa and cast material 830 MPa.The microhardness of multi-layer coating was higher than that of single layer coating.The wear resistance of the coating was at the same level with the wrought and cast materials.
Appropriate laser cladding processing parameters for a Ni-Fe-Cr based alloy coating with good quality were studied using 3.5 kW diode laser. The characterization of the coating was investigated, and the influence of each parameter was analyzed. The mechanical properties and wear resistance of the coating were compared with the corresponding chemical composition wrought and cast materials. The results showed that a coating with an aspect ratio of about 3, dilution ratio 8% -10% and wetting angle 35o-50 ° could be formed with the laser power 1200-1500 W, traveling speed 8-10 mm / s, powder feed rate 16-18 g / min and shield gas flow 15 l / min. Tensile strength of the coating reached 953 MPa which was higher than that of wrought material 918 MPa and cast material 830 MPa. The microhardness of multi-layer coating was higher than that of single layer coating. The wear resistance of the coating was at the same level with the wrought and cast materials.