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For more than thirty years,CALPHAD based tools have been successfully applied within the steel industry.Such tools are useful from an alloy design perspective and as a way of improving understanding of existing steels and process optimization.This presentation focuses on the thermodynamic modeling and precipitation simulation of high strength,low alloy(HSLA)steels.Thermodynamic calculations using Thermo-Calc can be used to predict the underlying thermodynamics of multicomponent alloys of industrial importance; phase equilibrium and phase transformation information by taking into account compositional and temperature variations,e.g.,the effect of an alloying element on the austenite to ferrite transformation temperature; segregation during solidification; driving force for nucleation; stability of precipitates; etc.Additionally,precipitation plays an important role in industrial steels,especially for strengthening HSLA steels.The precipitation kinetics of alloy carbides,i.e.,NbC,is simulated using TC-PRISMA,a computational tool that is integrated with Thermo-Calc and DICTRA together with additional interface property data.Properties such as interfacial energies between matrix and precipitate phases can be estimated by using an approximation model which has been implemented in TC-PRISMA.