LOW-POROSITY AND LOW-OXIDATION 316L STAINLESS-STEEL COATINGS DURING HVOF SPRAYING: NUMERICAL SIMULATION AND EXPERIMENT
Abstract
316L stainless-steel coatings with low porosity and low oxidation were successfully produced via High-Velocity Oxygen-Fuel (HVOF) spraying of 10–50 µm feedstock powder, combining numerical simulation and experimental validation. A gas-solid coupled multiphase flow model incorporating oxidation kinetics, employing Computational Fluid Dynamics (CFD), was developed to simulate the HVOF spraying process. The study delved into the effects of oxygen/fuel (O/F) ratio, reactant flow rate, and spraying distance on the gas flow field parameters (pressure, temperature, and velocity) and particle in-flight behaviors (temperature, velocity, and oxidation status). Furthermore, Response Surface Methodology (RSM) was utilized to quantitatively analyze the sensitivity of these parameters on the oxide layer’s thickness. The optimum spraying parameters (OSPs) predicted by the simulation results were determined: 2.7 for the O/F ratio, 0.025 kg/s for the reactant flow rate, and 350 mm for the spraying distance. Subsequently, HVOF spraying experiments based on the OSP yielded 316L stainless-steel coatings with a porosity of 0.18 %, an oxide content of 0.52 w/%, and excellent mechanical properties. This work provides valuable insights for the production of 316L stainless-steel coatings with minimal porosity and low oxidation through HVOF spraying.
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