15. Martensite: When ___________ cool down very rapidly, carbon atoms do not have enough time to form ___________. As result, the ___________ structure transform to a highly strained ___________ tetragonal form called martensite.
Ferrite, cementite, BCC, FCC
Ferrite, Pearlite, FCC, BCC
Austenite, Bainite, BCC, FCC
Austenite, cementite, FCC, BCC