The effects of alloying elements and microstructure on the impact toughness of powder metal steels

The impact toughness of powder metal steels is typically deteriorated when the strength is increased by adding specific alloying elements and modifying the microstructure. An earlier study by the authors demonstrated that the tensile strength and hardness of Ni-containing PM steels were much enhanced by the additions of Cr and Mo. To develop high-strength PM steels with high toughness, the effects of alloying elements and microstructure on the...