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Spheroidal Cast Iron
80μm
Click on features in the sketch for further information.
The background here is pearlite again. The solid-to-solid
transformation from austenite to ferrite and cementite results in the
phases growing in fine lamellae structures.
Remember, contrast of the lines is due to the etchant attacking
the grain boundaries of the pearlite. This means the relative proportions
of the two phases are difficult to estimate.