Linked from
The 12 pages that link to Austenite, each with the reason it gives.
QuenchingRelated: It is the high-temperature starting phase for many steel quenching treatments.
MartensiteRelated: Martensite forms when austenite transforms during rapid cooling.
CementiteRelated: Austenite transforms into cementite-bearing structures during cooling.
Heat treatingBroader topic: Many steel treatments first heat the material until austenite forms.