The paper deals with the study of thermo-physical properties of real tool steel grade. The work is focused mainly on phase transition temperatures, particularly liquidus and solidus temperatures determination. These key phase transition temperatures were studied using two thermal analysis methods: “direct” thermal analysis (TA) and Differential Thermal Analysis (DTA). Temperatures of solidus and liquidus are discussed with values used for real casting process and with theoretically calculated temperatures using selected polynomial equations and by SWs, such as Thermo-Calc 2015b version with database TCFE8 and IDS (solidification analysis package). Differences between solidus and liquidus temperatures were encountered between theoretical and experimental values and values used for real casting process. Temperatures of solidus and liquidus were specified with use of thermal analysis methods. Discussion of obtained temperatures is performed with possible impact to the real casting process.Keywords: solidus and liquidus temperature, thermal analysis, steel
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