基于失效机理分析的耐蚀抗磨高铬铜铸铁磨球开发OA

To address the severe corrosion-wear and short service life of high chromium cast iron grinding balls in wet grinding operations,this study employs a combined approach of multi-scale characterization and alloy design to systematically investigate the failure mechanisms and develop a novel high chromium copper cast iron grinding ball.Metallographic analysis,scanning electron microscopy,and energy spectrum analysis revealed that the failure primarily originated from matrix microcrack propagation,eutectic carbide fracture,and interfacial chromium-depleted zone formation.Based on the failure mechanism analysis,a strategy integrating copper alloying modification and thermodynamic calculation optimization was adopted to achieve synergistic regulation of material composition and microstructure.Experimental results demonstrated that when the copper content exceeded 1%,the self-corrosion potential of the grinding ball increased to-0.454 V with significant reduction in corrosion current density,indicating markedly improved corrosion resistance.Meanwhile,the copper alloying enhanced the impact toughness by 22%while maintaining high hardness of HRC 62.Industrial applications verified that the new grinding ball reduced consumption by 9.5%-12.8%under actual working conditions,demonstrating excellent engineering applicability.This research not only provides new insights for material design of grinding balls in wet grinding environments,but also offers important guidance for improving the service performance of wear-resistant materials.