Abstract
Austempered Ductile Iron (ADI) is widely implemented to achieve lightweight and optimized components in power transmissions (e.g., internal gear in planetary stages), by substituting steel castings or a combination of Ductile Iron and steel-assembled structures. In this paper, the contact fatigue of two ADI grades (ADI J/S900-8; ADI J/S1200-3) is investigated by disk-on-disk tests. The disk-on-disk contact is an analogy model of the tooth contact and represents the tribological conditions at a specific point on the path of contact. The experimental results cover the endurance limit as well as the short time fatigue behavior for both ADI variants. In addition, the pitting characteristics and microstructural changes are analyzed in order to get a further understanding of the fatigue behavior of ADI.
Highlights
Due to rising demands for a higher power density and the continuous pressure on production costs, there is a large potential for new materials in gear applications
The unique microstructure of Austempered Ductile Iron (ADI) results in material properties that are comparable to conventional structural steels
Besides the structural components such as planetary carriers or housing, ADI shows a high potential for rolling-sliding contacts because of its high wear resistance
Summary
Due to rising demands for a higher power density and the continuous pressure on production costs, there is a large potential for new materials in gear applications. Besides the structural components such as planetary carriers or housing, ADI shows a high potential for rolling-sliding contacts because of its high wear resistance. In terms of pursuing an integrated design of different functional components, the housing and ring gear of a planetary gearbox constitute a good example of the advantages of ADI (Figure 1) [7,8,9]. In this case, the assembly space, number of parts and, the production costs can be reduced. Considered is to give holistic information about applied to rolling-sliding slidingThe contacts, ratherapproach than providing a specific focus on a certain. Introduction and motivation of austempered ductile iron (ADI) in applications [2]
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