| whiteheart malleable iron [`wīt´härt `mal·yǝ·bǝl `ī·ǝrn] METALLURGY White cast iron malleableized and decarburized by heat treatment in an oxidizing material at 900°C for 100-150 hours; decarburization produces a light-colored fracture, in contrast to blackheart malleable iron, which is not decarburized. Also known as blackheart malleable iron. |