激光功率对JG-11铁基合金熔覆层组织和性能的影响OA

To improve the insufficient wear resistance and corrosion resistance of Q355 steel,JG-11 iron-based alloy cladding layers were prepared on its surface by laser cladding technology.With constant powder feeding rate and scanning speed,four laser power levels(1 020 W,1 200 W,1 380 W,1 560 W)were set to investigate the influence of power on the phase composition,microstructure,microhardness,wear resistance and corrosion resistance of the cladding layers.The results show that the main phases of the cladding layers are α-Fe matrix phase and multicomponent solid solution phases.Laser power only regulates grain size and crystallization state without forming new phases.At 1 380 W,the heat input and solidification rate are optimally matched,the microstructure is dense and uniform,the microhardness reaches a peak of HV464.46,the average friction coefficient is 0.32,and the wear rate is the lowest,showing the best wear resistance.At 1 020 W,the alloying elements are uniformly distributed,the passive film is intact,the self-corrosion current density is the smallest,and the corrosion resistance is the best.This study clarifies the regulation mechanism of laser power on the microstructure and properties of cladding layers,providing process and theoretical basis for the laser cladding surface strengthening of Q355 steel.