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 ...

Between 35 and 140 C/s the system at room temperature is a mixture of these two materials. The microstructure of martensite in austenite is shown in the micrograph. The black grains are the ...