The microstructure of martensite in austenite is shown in the micrograph. The black grains are the martensitic phase and the white the non-transformed austenite. The transformation does not involve ...

Because of the low carbon content the martensite is relatively dispersed. In this tempering process, martensite precipitates Fe 3 C in an a-iron matrix and the micrographs show how the cementite phase ...