Abstract
Differential scanning calorimetric (DSC) measurements to identify high-temperature phase transitions of two non-alloyed peritectic steel grades are presented and discussed in this paper. Netzsch STA 449 F3 Jupiter thermal analyser device was used to perform DSC experiments. Measurements of temperatures of phase transformations at the heating and cooling rates of 5 and 20 °C min−1 were conducted. Measurement conditions for determining the temperature of peritectic transition in two real steels grades were described. The influence of measurement conditions on the results of DSC analysis was discussed. It was found that heating rate slightly affects the temperature of peritectic phase transition. Experimentally obtained solidus and liquidus temperatures are in good agreement with values derived by numerical calculations using FactSage software with database developed by Scientific Group Thermodata Europe. New original data (phase-transition temperatures) were obtained in this study, which may, however, be used for modelling of the solidification behaviour of peritectic steel grades.
Highlights
Differential scanning calorimetric (DSC) measurements to identify high-temperature phase transitions of two non-alloyed peritectic steel grades are presented and discussed in this paper
Obtained solidus and liquidus temperatures are in good agreement with values derived by numerical calculations using FactSage software with database developed by Scientific Group Thermodata Europe
Only very small increase in heat flow can be observed with small change in heat capacity. This small change is typical for transformation of austenite to d-ferrite in hypo-peritectic steel grades
Summary
Differential scanning calorimetric (DSC) measurements to identify high-temperature phase transitions of two non-alloyed peritectic steel grades are presented and discussed in this paper. Measurements of temperatures of phase transformations at the heating and cooling rates of 5 and 20 °C min-1 were conducted. New original data (phase-transition temperatures) were obtained in this study, which may, be used for modelling of the solidification behaviour of peritectic steel grades. During non-equilibrium solidification, alloying elements segregate to the liquid phase, and the compositional range in which the peritectic reaction and subsequent peritectic transformation take place is extended. The most widely used method to characterize steel grades regarding peritectic transition is the calculation of carbon equivalent in which carbon content (C) and other alloying elements (Xi) in mass% are added up together with dimensionless coefficients (fi). The coefficients were published by several authors [4, 5], and they can be used in general expression for carbon equivalent:
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