Linked from
The 9 pages that link to Ferrite, each with the reason it gives.
SteelBroader topic: Ferrite is a major, relatively soft phase in many steels.
Cast ironRelated: It can form the softer metallic matrix surrounding graphite in cast iron.
TemperingRelated: Ferrite forms as carbon-rich martensite decomposes during tempering.
MartensiteRelated: Ferrite is a lower-carbon iron phase often present alongside martensite in steel.
CementiteRelated: Ferrite commonly forms the softer partner in microstructures containing cementite.