The project aim is to increase the fatigue and wear resistance of metastable austenitic CrNi steels through targeted generation of surface morphologies by particle structuring and ultrasound-assisted structuring. In addition to surface hardening and the residual stress state, microstructural parameters such as volume fraction, thickness and distribution of martensite will be quantified using light, electron microscopic and X-ray methods. The effects of phase transformation on fatigue and wear behavior will be evaluated by magnetic measurement methods. The intention is to establish surface generation morphology-property relationships for metastable austenitic CrNi steels.