Herein, the fatigue damage mechanisms of a low-alloyed 0.5 wt% carbon steel (50CrMo4) are examined in high cycle and very regime, taking into account different strength conditions. For this purpose, heat treatment material is conducted using two batches at tempering temperatures, which lead to hardnesses 37HRC 57HRC, respectively. The tests accounting for test frequencies f = 95 Hz 20 kHz, as w...