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Thermodynamic modeling for the alloy design of high speed steels and high chromium cast irons = Termodinamično modeliranje načrtovanja sestave hitroreznih jekel in litine z veliko vsebnostjo kromaPellizzari, MassimoIn recent years, Thermo-Calc was successfully used by the author for the development of as-cast High Speed Steels and High Chromium Irons. The correlation between solidification process and ... microstructure was studied in view of influence of alloying elements introduced to promote carbide precipitation. The solidification process occurs under non-equilibrium conditions, because of microsegregation phenomena connected with the solidification structure: the liquid between dendrites becomes progressively enriched in solute and its composition increasingly differs from that predicted by the equilibrium diagram. This behavior can be studied with good approximation by using the model proposed by Scheil and Gulliver. In this way it was possible to refine the phase constitution of High Speed Steels, even if kinetic-related phenomena still limit its correct prediction. Present results also show that microstructural tailoring is possible looking at the correlation existing between the fraction of liquid phase at eutectic MC carbides precipitation. The morphology of V-rich particles changes from a continuous interdendritic network to a globular dissociated eutectic, showing higher toughness. The composition of HiCrI should result as near as possible to the eutectic, to maximize eutectic carbide amount. Calculations allowed to define the parameter TL-TEi (TL = liquidus temperature; TEi = eutectic start temperature) as representative of the material hypoeutecticity, and, on the basis of experimental results, a value of 20 °C was safely established in the development of the new composition.Source: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Vol. 44, no. 3, 2010, Str. 121-127)Type of material - article, component part ; adult, seriousPublish date - 2010Language - englishCOBISS.SI-ID - 815274
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source: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Vol. 44, no. 3, 2010, Str. 121-127)
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