Fatigue Fracture Mechanism Maps for SUS304 Stainless Steel

摘要

Fatigue fracture mechanism maps at room temperature and 300°C for SUS304 stainless steel were established by SEM observation of the fracture surface. Depending on the crack propagation rate ranging from 1×10{sup}(-11) m/cycle to 1× 10{sup}(-6) m/cycle, three types of fracture surfaces were observed. One was crystallographic fracture region which was flat and dark by SEM observation, second was featureless fracture region which was rough and white, and third was striation region which was typical fatigue failure. Fraction of these regions in fracture surface depends on the crack propagation rate, so the fatigue fracture mechanism maps are useful for the fractography of the fatigue failure accidents.