Cementite (Fe3C) is formed when the solubility limit of
α ferrite phase C below 727 0C is exceeded. In terms
of mechanical properties, cementite is very hard and brittle and plays
an important role in strengthening the structure of steel. The cementite
can remain compound at room temperature for half-stable indefinitely,
but when it is subjected to aging heat treatment, it converts to α
ferrite and graphite.
The structure formed by the combination of α ferrite and
Fe3C layers (Lamels) is called perlite repeating one by
one as a result of slow cooling of the steels. Due to its ferrite and
cementite structure, perlite is more ductile, it has mechanical
properties such as ferritic structure and harder and brittle cementite
phase.
Figure 6 and 7 shows the EDS analysis that we have taken from the whole
of the material and some parts of it. In the analysis we received from
the overall structure, the distribution in the structure was better
observed by making different coloring for each metal alloy. As a result
of EDS analysis it is seen that the matrix consists of 96.93% Fe and
other elements are in small amounts.
When we examine the spectrum peaks obtained from the EDS analysis, the
two compounds come to the fore: in addition to compounds consisting of
C, Mn and Si, compounds consisting of Fe and Mn are observed.