The Process Research Of 316L Stainless Steel Inclined Thin-Walled Parts Made By Laser Cladding Forming

Metal material laser cladding forming is one of the major trends of additive manufacturing technology. It has wide application prospect in aerospace, automobile, ship, weapons and equipment, ect. Technology of laser cladding forming shows unique advantages in the fabrication of inclined thin-walled parts. But it still has problems in forming quality and precision. In this paper, the process of laser cladding forming based on the material of 316 L stainless steel powder was studied.Firstly, the temperature field and processing parameters for single channel laser cladding of 316 L stainless steel powder were simulated by ANSYS. Processing experiments about single channel laser cladding of 316 L stainless steel powder were conducted by orthogonal method. Process parameters were optimized by the orthogonal analysis. Process parameters are as followed: feeding rate is 4.714 g/min, scanning speed is 5 mm/s, laser power is 600 W.Then, the forming experiment and simulation about thin-walled parts were conducted according to the optimized process parameters. Problems in the process of forming were analyzed and solved. Process parameters are as followed: flow rate of shielded gas is 15 L/min, continuous forming layer is 5, cooling time is 10 min.Finally, solid parts were prepared by different filling paths and the mechanical properties about them were tested. The results of tensile experiments about laser cladding parts are as followed: the yield strength is 521.3 MPa, the tensile strength is 718.1 MPa and the elongation is 44.4%. Mechanical property of vertical X-Y direction filling path is superior to other filling paths and it is uniform for all directions. Laser cladding organization of 316 L powder presents metallurgical bonding state between two layers does not have pores and cracks, so it meets manufacturing requirements.