Origin of Abnormally Large Tetragonality of Martensite in High Carbon Iron Alloys Containing Aluminum

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The origin of abnormally large tetragonalities of martensite in Fe–Al–C alloys with a high carbon content (about 2 mass%) has been studied from various aspects; i.e., effects of Al content, small amount of Mn addition and quenching rate on the martensite tetragonality (c⁄a) were examined. First, it is found that the martensite tetragonality depends on the austenitic state. If the austenite contains fine κ-phase precipitates, large c⁄a is obtained. Furthermore, the existence of a dumbbell structure of C–Fe–C in the austenite is very effective in enhancing the tetragonality. A possibility of the formation of the L12 superlattice structure in the austenite is ruled out. The tetragonality of the “fresh” martensite (the c⁄a value of the as-formed martensite at low temperature) is decreased with increasing temperature as in the case of previously reported Fe–Ni–C alloys, indicating the change in interstitial positions of carbon atoms.

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