Microstructure evolution in warm forged sintered ultrahigh carbon steel

null null Fe–1.4C–0.65Si–0.85Mo ultrahigh carbon steel was liquid phase sintered in 10%H 2 –90%N 2 null at 1300 °C from Hoganas Astaloy 85 Mo HP base iron, fine graphite and silicon carbide powders mixed with polypropylene glycol. The microstructure then comprised fine pearlite and grain boundary cementite networks and the density increased from ∼6.8 g cm −3 null to ∼7.7 g cm −3 . A group of specimens then underwent austenitisation, isothermal...