The microstructure is now a ploycrystalline pearlite with the hard-brittle proeutectoid cementite on the grain boundaries. This structure makes the alloy more brittle than the eutectoid pearlite ...
This is illustrated on the phase diagram and shown in the photomicrograph. The ductility of the ferrite makes this alloy more ductile than the eutectoid pearlite structure.
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