Abstract
New cermets consisting of TiC(Fe23Ni1.5C) (mass%), whose binder phase exhibits an f.c.c.-to-b.c.t. martensitic transformation have been made and their mechanical properties and crystallography have been investigated to determine the influence of transformation on the fracture toughness of the cermet. As a result, the toughness of the cermet is found to be higher than that of a conventional TiCNi cermet, whose binder phase does not undergo martensitic transformation, although the hardness is not much different comparing the two. It is also found that characteristics of the thermally induced martensite in the binder phase, such as the M s temperature, are quite different from those of bulk specimens of the same composition as the binder phase. The results described above are similar to those for a WC(Fe23Ni1.5C) cermet previously investigated.
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