Investigation of Material Removal Mechanisms for DZ125 Nickel-Based Alloy Using Fiber-Reinforced Fluid in Grinding Wheel Drag-Driven Jet Polishing Abstract：

DZ125 nickel-based alloy is a critical material for manufacturing turbine rotor blade tenons in aero-engines. However, its grinding surfaces are prone to various defects. Removing surface defects through polishing is crucial for enhancing the service performance and lifespan of components. To achieve high-efficiency and high-quality polishing, this study investigates the effect of adding fibers to polishing fluid to alter its rheological properties during grinding wheel drag-driven jet polishing of DZ125 nickel-based alloys. First, finite element simulations were employed to analyze how changes in the rheological properties of the polishing fluid influence the magnitude and distribution of surface pressure and shear stress during the process. The results indicate that increased polishing fluid viscosity significantly enhances shear stress while minimally affecting dynamic pressure. Experimental observations revealed that, at the same mass fraction, wooden fibers modify the kinematic viscosity of the polishing fluid more rapidly than other fibers. Polishing experiments demonstrated that under identical process parameters, the addition of wooden fibers yielded superior surface quality, achieving a surface roughness (Ra) of 0.338µm ± 0.013µm (The initial surface roughness is Ra1.142µm ± 0.011µm.). In contrast, surfaces polished without fibers exhibited an Ra of 0.445µm ± 0.016µm, representing a 24% reduction in Ra(The polishing time is reduced by 30%.). Furthermore, as the wooden fiber concentration increased from 1–3%, the rate of surface roughness improvement accelerated, and polishing efficiency progressively increased. However, when the fiber concentration exceeded 3%, dispersed fibers rapidly agglomerated, leading to diminished polishing efficiency and surface quality. This study contributes to advancing efficient, eco-friendly, and high-quality polishing of nickel-based alloys.