MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Fe-Cr-Mo-[Cu-Ni]-C SINTERED STEELS

Journal article, 2010

The effect of high-temperature vacuum sintering (11800C) integrated with high (6K/s), medium (3K/s) and slow (0.1K/s) cooling rates and conventional sintering at 11800C with cooling rate of ~0.17K/s on shifting the microstructural composition to significant portion of martensite-bainite and thus effective improvement of mechanical properties of Fe-Cr-Mo-[Cu-Ni]-C sintered steels (Astaloy Cr+1 and 2% Cu and/or 50% Distaloy AB powder was investigated. In dependence on chemical composition the yield and tensile strengths of 890-1150 MPa and 913-1230 MPa and impact energy of 10-15 J were achieved by sinter-hardening. The yield and tensile strengths were approximately double than those resulting from conventional sintering.