Research on convection and mass transport in laser cladding: FeCrSiB alloy

An influence of laser beam shape, processing parameters and well as dilution rates on laser cladding have been systematically investigated by OT, SEM, EPMA and X-ray with PSPC in this paper. It is shown that a lot of interesting macro-convection patterns have been observed in FeCrSiB alloy clad layer. Symmetrical distribution of laser beams produces bicyclic symmetrical fluid flow patterns. On the other hand, unsymmetrical distribution of the beam produces two unsymmetrical circle patterns even a single circle. At heavy dilution rates, the fluid flow results in macrosegregation and macroalloying which produces a different microstructure from the ideal clad and reduces the performance of the clad layer. The clad materials with dγ/dT are easily diluted by substrate. In order to get good clad characteristics, the dilution rates must be rigorously controlled.An influence of laser beam shape, processing parameters and well as dilution rates on laser cladding have been systematically investigated by OT, SEM, EPMA and X-ray with PSPC in this paper. It is shown that a lot of interesting macro-convection patterns have been observed in FeCrSiB alloy clad layer. Symmetrical distribution of laser beams produces bicyclic symmetrical fluid flow patterns. On the other hand, unsymmetrical distribution of the beam produces two unsymmetrical circle patterns even a single circle. At heavy dilution rates, the fluid flow results in macrosegregation and macroalloying which produces a different microstructure from the ideal clad and reduces the performance of the clad layer. The clad materials with dγ/dT are easily diluted by substrate. In order to get good clad characteristics, the dilution rates must be rigorously controlled.