How to set critical points on a dilatometric curve-determination of CCT of a steel

Hello everybody,

I have just started a PhD lately; the project is about characterisation
of microstructure of steels with bainitic and acicular ferritic
structure; I need to create CCT diagrams from dilatometric curves of
the aforementioned materials. Now, setting those critical points
indicating the start /beginning of the transformation seems somewhat
fuzzy to me; could anyone give me some hints/references/articles about
the way it's done?

Thanks in advance,

Metalo

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