Abstract
Austempered Ductile Iron (ADI), which has much the same strength and toughness as usual steels, has been developed. ADI has many advantages in mechanical properties and manufacturing, such as weight reduction, good properties of vibration and noise, low cost in machining and heat treatment of blanks due to near-net-shape casting. In this paper, the load-carrying capacity, which indicates both surface durability and bending strength, of gear pairs with a combination of Austempered Ductile Iron (ADI) gear and hardened steel one is investigated using a power-circulating type gear testing machine. Especially, the performance of ADI gears treated with cermet-finish bobbing and several types of shot peening are examined. The impact strength of ADI gear is also examined with an impact testing machine for gears. Furthermore, the application example of ADI cast as one body with the gear and the nearby member is proposed.
