CANCELLED: Effect of Laser Cladding Process Parameters on Microstructure and Properties of Martensitic Stainless Steel Cladding Layer

Laser cladding is a technology that uses high-energy-density lasers to quickly melt and solidify alloy powder on the surface of the metal substrate to form a cladding layer with good performance. Especially, martensitic stainless steel is widely used as a cladding material due to its high hardness and wear resistance. In this work, the martensitic stainless steel layers were fabricated on the 45# steel substrate by the laser cladding with different process parameters. The results show that the laser cladding process parameters, including the laser power, scanning speed, overlap ratio, have the important influence on the location of cracks and residual stress in the cladding layer. The residual stress in the cladding layer is the main cause of crack defects. Under the optimal process conditions, the minimum residual stress of the cladding layer is only -245MPa, which is 30.6% lower than the maximum residual stress with -353MPa. In addition, the microhardness of the cladding layer is 701.68 HV0.2, the friction coefficient is 0.51, the wear loss is 0.7 mg, the self-corrosion potential is -426.41 mV, and the self-corrosion current density is 0.45 μA/cm2。