Abstract:Aiming at the outer and edge collapse of the variable radius cylinder by laser cladding forming, the decrease of the mechanical properties caused by the thermal accumulation effect. The optimized path and process of FeCrNiCu alloy cylinder by pulsed laser forming was put forward, the direct cladding forming of the variable radius cylinder structure was realized, the good structure and mechanical properties of the structure were verified. The experiment results show that, the top of the forming layer is fine and dense equiaxed crystal structure, the middle of the forming part is composed of dendrites with a certain directional growth trend, the bottom of the forming part is composed of cellular crystal, and there are granular Cr7C3 enhanced precipitated in and between the crystals. The highest microhardness of the coating is 675HV0.1, and the microhardness of the coating is mainly distributed in 554 ~ 576HV0.1. The maximum longitudinal tensile strength of the forming layer is 1070 MPa, and the tensile strength is range from 1010 to 1070 MPa, the maximum transverse tensile strength of the forming layer is 860 MPa, and the tensile strength is range from 780 to 960 MPa. The impact toughness distribution of the coating is 511 ~ 727.5 kJ?m-2, the excellent mechanical properties of the forming part were verified by the relevant mechanical experiments.