抄録
This report shows results of fatigue properties and fracture mechanism of dual phase stainless steels. The dual plase stainless steels are often used because of advantageous properties of corrosion resistance for seawater, weldability and workability. Recently, a new fatigue problem becomes important, because number of cycles to failure that should be taken into consideration for a maintenance increases over (10)^7. For the ultra-high-cycle fatigue, interior inclusions in materials are dominant factor in fatigue life, but the fracture mechanism is not make clear completely. Results of the ultra-high-cycle fatigue properties are shown. The interior fracture takes place at ultra-high-cycle region. The crack growth life is predicted by using fracture mechanics.
