抄録
Fine spheroidal graphite cast iron (FCD-M) has some superior features. One is high tensile strength and fatigue crack propagation resistance. The other is a good molding nature, such as shape accuracy, compared with another cast or forged iron materials. For the purpose of applying FCD-M to axial-flow fan blades, test blades made of FCD400M were manufactured and investigated to obtain strength properties and profile accuracy. Because these results satisfied design criteria, FCD400M were practically used to rotor blades for axial-flow fan. The axial-flow fan with FCD400M blades showed almost the same performance (P-Q characteristic curve and efficiency) as a fan with NC machined blades.
