Laser Cladding of 17-4 PH Stainless Steel Coatings: Microstructure, Texture Characterization, and Corrosion Resistance

As an advanced material surface modification technology, laser cladding technology has been widely used in the preparation of high-performance coatings and the repair and remanufacturing of failed parts. In this study, the 17-4 PH stainless steel cladding layer is fabricated on E355DD substrate by laser cladding technology. The effect of laser power on the microstructure, texture characterization, and corrosion resistance of the sample is thoroughly investigated. When the laser power is 2000 and 2400 W, the prepared cladding layer has defects such as pores. A related model is established to explain the reasons for the generation of pores and the Marangoni effect in laser cladding. When the laser power is 2200 W, the correction current density of the sample is  2.96 × 10−7 Acm−2, and the corrosion resistance is better than that of the substrate and other samples, which is benefit from fewer defects.