Saddei, Peter
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Item-typ:Veröffentlichung, Discontinuous profile grinding of multi-phase, case-hardened gears with improved load-carrying capacityHighly-loaded transmission components like gears are case hardened for most applications to reach a load adapted strength. The surface layer microstructure as a function of heat treatment decisively determines the achievable load-bearing properties of the component as well as the technological limits of gear grinding. Against this background, this paper deals with the machinability (discontinuous profile grinding) of differently (carburizing and carbonitriding) case-hardened gears with various multi-phase microstructures and improved load-carrying capacity. Therefore, effects of different material phases, precipitates and their distribution in the surface layer on the gear-grinding process will be discussed.Wissenschaftlicher ArtikelBand:68Heft:1104 110 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Gefügeaufbau und mechanische Eigenschaften nach Einsatzhärten außerhalb des üblichen Parameterfeldes(2019-01-16); ; ; A large part of the components used today, for example in gearbox construction, such as gears or bearing components, is adjusted to the stress during operation in a mostly thermochemical heat treatment process (usually gas carburizing). The resulting, mainly martensitic structure has been optimized in recent decades only within relatively narrow limits, especially with regard to increased component reliability and overall cost reduction. Due to increasing scarcity of resources and increasing limitations in terms of size or component weight, the trend in the recent past goes in the direction of increased load capacity or higher power densities. In addition to the use of costly high-alloy and / or high-purity material concepts, the research of novel surface-layer compositions has been brought into focus by mostly thermochemical heat treatment processes (i. e. carbonitriding). Before a possible adoption of these new boundary layer concepts into the industrial practice, however, a series of studies for better assessment and for a better understanding of the material-technical basics and relationships is necessary to assess potentials and risks. Important subgoals are: Detailed characterization and description of today's uncommon surface layer structure Testing and comparing novel heat-treated model samples with the standard to demonstrate the potential of the new heat treatment variants Basic studies on the conversion behavior and the retained austenite stability of the new process variantsDissertation465 290