| Change of microstructure and pore shape during sintering was investigated in Fe-2.5% Si-l.4%C compacts. The compacts were sintered at 1140, 1150, 1160 and 1170℃ in Ar atmosphere for various sintering time. Slow and rapid cooling after sintering allowed to examine the behavior of inter-diffusion between elemental particles, change of microstructure and pore shape of sintered alloy. At early stage of sintering, as-quenched microstructure was fine pearlite and it changed to marten-site with succesive sintering upto 27 hr. This change of microstructure with sintering time seems closely related to the homogenization process of Si. Dissimilarly to the previous reports, two type of pores, surrounded by ferrite or pearlite, were observed in slowly cooled specimen after sintering 27 hr. This result suggests that the local content of carbon and silicon were slightly different due to the sluggish diffusion of Si. |
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