Differential scanning calorimetry study of peritectic steel grades

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.

Application of Thermal Analysis Tests Results in the Numerical Simulations of Continuous Casting Process

“…The chemical composition of the selected steel grades is presented in Table 1 Differential scanning calorimetry (DSC) was used to measure the thermophysical properties of the selected steel grades [6]. Out of the available methods of thermal analysis, the DSC method and differential thermal analysis (DTA) are the methods that are most often applied in metallurgy [5,[7][8][9]. The DTA analysis is used for identification of phase transition temperatures in steels, e.g.…”

“…In the reference material used in the tests, within the assumed temperature range, no structural changes should occur. Analysis of the recorded change in the heat fluxes from reference material and steel sample allows identification of phase transitions in the steel [8]. In practice, as the measurement is performed under isobaric conditions, the recorded difference in heat fluxes corresponds to enthalpy changes as a function of temperature, whereas the peak areas correspond to the heat of phase transitions occurring in the steel.…”

Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel within the Heat Treatment Temperature Range

“…The temperatures of phase transformation depends on the heating rate used in thermal analysis methods [6]. The importance of this parameter on shifts of the phase transformation temperature was presented at Fig.…”

“…Examinations of steel phase transformations conducted at a high temperature range allow us to determine the characteristic temperatures -the solidus and the liquidus, which are both important for planning the continuous casting process technology [4][5][6]. Numerical simulation of metallurgical processes, at which the crucial physical phenomena like solidification extends in high temperature region, requires reliable information about latent heat of phase transformations and temperature dependence of the specific heat [7].…”

Phase Equilibrium and Austenite Decomposition in Advanced High-Strength Medium-Mn Bainitic Steels

“…They consist of different soft and hard structural constituents in various proportions, which enable the attainment of a very wide range of mechanical and technological properties. The microstructure of dual-phase (DP) steel consists of soft ferrite and hard martensite, whereas the multiphase microstructure of TRIP (transformation-induced plasticity) steel comprises ferrite, bainite, and retained austenite [1][2][3][4][5][6]. New demands of the automotive industry for relatively low-cost steel sheets characterized by tensile strength above 1000 MPa require further searching for new chemical composition strategies.…”