| owder metallurgy is an economical processing route for shaping powders directly into a final component form. Sintered steels, powder metallurgy products, have been studied and developed for many years, but their applications remain limited, partially due to a limited understanding of their temperature dependent performance. The objectives of the present work are to study the mechanical properties of a sintered steel (Fe - 0.82%C - 1.9%Cu) and investigate the mechanisms of fatigue and fracture of it at elevated temperatures, including (1) tensile and fracture behavior, (2) mechanisms of fracture toughness, (3) long and small fatigue crack propagation behavior at elevated temperatures and different R values ;The tensile elastic-plastic behavior of sintered steel is well described by the Ramberg-Osgood equation which provides a reliable model for the fracture toughness analysis. The results of fracture toughness tests showed... |
