Abstract :
FeTi, B2O3, Al, and FeW particulates,
approximately 40–60 lm in size, were mixed in stoichiometric
ratio and sintered at 1,200 C. The sintered particulates
were added as 5 wt% to molten high chromium
white cast iron over 50 C-deg above the melting temperature,
and stirred at 1,000 rpm. The samples were investigated
in three groups: (1) high Cr white cast iron
inoculated by the particulates sintered from Al–FeTi–B2O3
particulates; (2) high Cr white cast iron inoculated by the
sintered particulates derived from Al–FeTi, B2O3, and FeW
particulates; and (3) specimens of the second group that
were subsequently homogenized. The microhardness of
ceramic particulates was measured as 2,800–3,400 HV10.
The effect of sintered particulate volume fraction on the
abrasive wear resistance of the high chromium white cast
iron was determined. The wear resistance and hardness of
the composites improved significantly as a result of particulate
inoculation. The application of the homogenization
heat treatment to the inoculated samples produced a
microstructure having homogeneously distributed particulates.
