Notch Sensitivity of Austenitic and Duplex Stainless Sheet Steels

摘要

Fatigue notch sensitivity has been investigated for a duplex stainless steel(SAF2304), and for one austenitic stainless steel (SS2333) in annealed and in prestrained condition. Specimens with three different elastic stress concentration factors between 1.02 to 2.23 have been tested. Fatigue strength for notched specimens have at the most been found to be 20% lower than fatigue strength for unnotched specimens. Fatigue strength improvement due to prestraining of austenitic stainless steel is shown for small elastic stress concentration factors. However, as elastic stress concentration increases, the positive effect of fatigue strength is reduced due to larger notch sensitivity for prestrained material.