Abstract
In this study, we selected the Mn and Si as strengthening elements for high strength sintered steels to eliminate the Cu and Ni. Improvement of the tensile strength as well as the toughness was investigated in Fe-Mo-Mn-Si-C sintered steels using a Fe-Mn-Si-C master alloyed powder as additives. Developed sintered steels have the dual phase microstructure composed of lower bainite and island shaped martensite, and this microstructure realizes the high tensile strength and impact value more than 950 MPa and 48 J/cm2 respectively at the density of 7.4 g/cm3.
