Effect of short-range ordering on martensitic transformation in iron-nickel-carbon alloys

The paper presents a theory of thermodynamics and kinetics of short-range ordering in Fe-Ni-C alloys based on the general approach developed by M.A. Shtremel. Equilibrium order parameters and kinetics of their establishing during isothermal holding are calculated for several alloys. Effect of order changes on free energies of austenite and martensite forming from it is calculated, as well as the decrease of martensitic point due to ordering. Calculated results are compared with existing experimental data on thermal stabilization of Fe-Ni-C austenite after holding above Ms.