Annealed 1018 Steel - Investigating Darker Regions

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SUMMARY

The discussion focuses on the microstructural analysis of annealed 1018 steel, specifically identifying the darker regions as perlite. 1018 steel contains 0.18% carbon, and the annealing treatment results in a microstructure comprising both perlite and ferrite. The darker areas in the provided micrograph are confirmed to be perlite, while the brighter regions represent ferrite.

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Hi, steel 1018 usually has between 0.15-0.20 % of Carbone, yes, the darker regions are perlite
image002.jpg
 
Sure, dark structure is Perlite.
Carbon fraction is given in alloy specification

1018 \rightarrow 0.18% Carbon

And ... Annealing Treatment ( Total Annealing) may result in perlite + ferrite.
It's shown in your micrograph
Dark - perlite
Bright - Ferrite
 

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