The transition from LCF- to HCF-regime is determined by one strain increase test. Dynamic strain aging significantly influences the HCF cyclic deformation behavior. The DSA-relevant temperatures are determined by one temperature increase test. PhyBaLSIT: Assessment of HCF Wöhler-curves from ambient temperature up to 400 °C. Temperature- and load-dependence up to 400 °C determined by 13 fatigue tests.