Abstract
From information on M s for lath and lenticular martensite the driving force for the start of a formation of the two types of martensite was calculated in a number of Fe-X systems. By plotting the calculated driving force against temperature the results indicate that the driving force for formation of martensite may not be much affected by solution hardening but mainly be a function of temperature. From the kinetics of isothermal a martensite in ferrous alloys one can clearly distinguish between two groups of alloys, high alloy steels and carbon containing steels. High alloy steels with low M, temperature have a temperature dependence corresponding to a very low activation energy, possibly 7 kJ/mol. It can hardly depend on any diffusion process. Carbon containing steels have a temperature dependence corresponding to an activation energy of about 80 kJ/mol. Its rate of formation can be explained by assuming that it is triggered by submicroscopic plates of bainite formed with a rate of carbon diffusion.
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