Influence mechanism of abrasive belt wear on fatigue resistance of TC17 grinding surface

Abstract

Abrasive belt grains morphology and wear process have direct effect on grinding surface quality and service performance of titanium alloys. In order to increase fundamental understanding of abrasive belt wear on service performance of grinding surfaces, further provide targeted guidance for anti-fatigue surface grinding, this paper analyzed the surface characteristics and fatigue failure mechanism of the TC17 samples ground before and after abrasive belt wear. Results showed that for zirconium corundum abrasive belt with relatively independent abrasive grains, the fatigue failure of machined surface before abrasive belt wear is dominated by roughness. After zirconium corundum abrasive belt was worn, grinding surface roughness is reduced and surface mechanical properties are strengthened, which promotes the initiation of fatigue cracks from the subsurface and the improvement of fatigue life. Although the wear of electroplated diamond abrasive belt can reduce the surface roughness of grinding surface, the embedding and accumulation of abrasive grains hindered the chip removal and heat dissipation in material removal process, making the grinding surface easy to form heterogeneous ablative layer, and fatigue cracks initiated from the subsurface ablation area. The heterogeneous areas formed by surface burns will exacerbate surface stress concentration, which in turn will greatly reduce surface fatigue performance, it needs to be avoided as much as possible. Sharp electroplated diamond belts and worn zirconium corundum belts have excellent advantages in improving surface anti-fatigue performance.