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 ...

In (c) the cooling rate was too fast to permit the equilibrium phase transition to occur and martensite was formed from both the liquid zone and the austenite. The weld is now hard and brittle, ...

SOME observations were made of the effect of heating rate on the martensite (M)→austenite (γ) reversion in a 300-grade 18 per cent nickel maraging steel. These are discussed here with reference ...