Abstract
Conventional duplex stainless steel degrade in wear and mechanical properties at high
temperature. Attempts have been made by researchers to solve this problems leading to the
dispersion of second phase particles into duplex matrix. Powder metallurgy methods have been used
to fabricate dispersion strengthened steels with a challenge of obtaining fully dense composite and
grain growth. This could be resolved by appropriate selection of sintering parameters especially
temperature. In this research, spark plasma sintering was utilized to fabricate nanostructured
duplex stainless steel grade SAF 2205 with 5 wt.% nano TiN addition at different temperatures
ranging from 1000 °C to 1200 °C. The effect of sintering temperature on the microstructure,
density, hardness and wear of the samples was investigated. The results showed that the densities
and grain sizes of the sintered nanocomposites increased with increasing the sintering temperature.
The microstructures reveal ferrite and austenite grains with fine precipitates within the ferrite
grains. The study of the hardness and wear behaviors, of the samples indicated that the optimum
properties were obtained for the sintering temperature of
1150 °C.