Lokale Hochverformung zur Erzeugung von ultrafeinkörnigen Zonen

Local severe plastic deformation for producing ultrafine‐grained regions The methods of severe plastic deformation are able to produce semi‐finished products with a homogenous ultrafine‐grained microstructure. An alternative option is the formation of ultrafine‐grained layers or rather a gradation of the grain size. The qualification of incremental bulk forming processes is concluded from an analysis of methods for producing ultra fine‐grained materials and the kneading in cyclic forming. Spin extrusion is investigated regarding the formation of ultra fine‐grained regions. Tests are carried out to analyse the grain refinement in cyclically deformed regions.