Abstract
The article describes the effect of input material structure on the structure development during the subsequent processing by mini-thixoforming technology. Two different initial states were prepared from X210Cr12 tool steel for the experiment. The first semi-product was used in the soft-annealed state with ferritic-carbidic microstructure and coarse primary chromium carbides. Ferritic grain size 13,7μm and the hardness was 210 HV30. The second state was prepared by high temperature annealing at 1200°C for 1 hour. The microstructure then consisted of austenite and carbides. The grain size was in the range of cca 37 to 50μm, hardness was 300 HV30. Treatment consisted of heating to a semi-solid state at the temperature 1265°C in 9 s. That was followed by direct cooling to room temperature in 2 s. The grain size and distribution of eutectic in the volume of the processed material were selected as the attributes for microstructure evaluation after mini-thixoforming. The structure after processing in a semi-solid state consists of polyhedral austenite with a grain size of 43-59μm, compared to the initial range 37-50μm. This compares to the soft annealed state when, after semi-solid processing, the grain size was only 10 to 13 microns.
Published Version
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