Numerical Simulation of Hardening and Tempering of the High Speed Steel Bohler S390 MICROCLEAN

摘要

The advantages of heat treatment simulation are introduced. The amount of experimental work needed to generate the important input data is emphasized for this type of numerical simulation. The input data consist of mechanical and thermal data for every phase. Aditionally, these data are strongly temperature dependant, which results in an enormous expenditure on experimental work. Lastly, the precise mechanical and thermal boundary conditions are necessary for the simulation. The microstructural changes during hardening and tempering of the high speed steel S390 MICROCLEAN and the resulting changes in dimensions are described by dilatometer experiments. The phase transformation models introduced for the prescribed heat treatment are validated by comparing measured with calculated dilatometer curves and volume fractions of generating phases. The models are evaluated on a real tool made of S390 MICROCLEAN. The advantages of the described simulation are demonstrated by a calculation of changes in dimensions.