Relations between microstructures, fracture mechanism and fatigue properties in structural materials

To date, a number of studies have focused on the fracture surfaces of structural materials. However, there is still no report that quantitatively evaluates the change in the fracture surface patterns with fatigue crack growth. This report details the relations between the microstructures, the fracture mechanism, and the fatigue properties of austenitic SUS316 steel of high ductility and moderate strength, and a cold-worked and aged copper alloy C17200 of high strength and low ductility.