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Material properties like yield stress and hardness change during forming. Metastable austenitic steels are characterized by an elevated work hardening potential due to strain-induced transformation of austenite into martensite especially by multi-stage processing. An application of a new rotary swaging process design with Eccentric Flat Shaped Dies (EFSD) enables a severe shear strain in the workpiece. Eccentric rotary swaging typically provides a helical material flow. According to the process parameters, the microstructure features a typical eddy pattern with a spiral shaped grain orientation. The forming process can be carried out in one or more processing steps. The properties of the formed workpieces can be adjusted both by a variation of the process parameters values and by a specific subsequent heat treatment. This work is focused on microscopic investigations of the microstructure of in one and two steps eccentrically swaged parts with and without subsequent heat treatment.

Multistage Eccentric Rotary Swaging: Dedicated to Prof. Dr.-Ing. habil. Peter Mayr on his 80 th birthday