+**Ae3** marks the upper critical temperature where, upon heating, the last traces of [Ferrite](/wiki/ferrite) transform into [Austenite](/wiki/austenite) in hypo-eutectoid steels. This signifies a complete [Phase Transformation](/wiki/phase_transformation), vital for determining material properties and heat treatment processes.
+## See also
+- [Ae1](/wiki/ae1)
+- [Heat Treatment](/wiki/heat_treatment)
+- [Phase Diagram](/wiki/phase_diagram)
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