peeneteraline ferriidi ja stabiliseeritud austeniidi segu; tagab isotermkarastatud keragrafiitmalmi suure kõvaduse ja plastsuse (vt ferriit, austeniit), fine-grained mixture of ferrite and stabilized austenite which should lead to high hardness and ductility of austempered ductile cast iron (see: ferrite, austenite)
