Since
the sintered steels, investigated in this work, are hypo-eutectoid steels
with carbon contents of 0.01 and 0.1 wt.% and are rapidly cooled from
1280 °C, which is above the eutectoid temperature of 786 °C (the eutectoid
point for Fe–3.0Cr–0.5Mo–xC materials correspond to 0.35 wt.% C
at 786 °C [58]), the proeutectoid αA is formed and it high-lightens the γ
grain boundaries