Experimental study of Fe–C–O based system above 1,000 °C

The study deals with precise determination of phase transformation temperatures of steel. A series of experimental measurements were carried out by Differential Thermal Analysis (DTA) and Direct Thermal Analysis (TA) to obtain temperatures very close to the equilibrium temperatures. There are presented results from the high temperatures region, above 1000 °C, with focus on the solidus temperatures (T S), peritectic transition (T P) and liquidus (T L) of multicomponent steels. The data obtained were verified by statistical evaluation and compared with computational thermodynamic and empirical calculations. The calculations were performed using 15 empirical equations obtained by literature research (10 for T L and 5 for T S), as well as by software InterDendritic Solidification (IDS) and Thermo-Calc (2015b, TCFE8; TC). It was verified that both thermo-analytical methods used are set correctly; the results are reproducible, comparable and close to equilibrium state.

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“…%), on melting temperature of pure nickel (99.999 wt. %), on influence of the heating rate and on influence of the sample mass [22].…”

Section: Methodsmentioning

confidence: 99%

Prediction and measurement of selected phase transformation temperatures of steels

Martiník

Smetana

Dobrovská

et al. 2017

J min metall B Metall

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“…The measurements were conducted in the inert atmosphere of pure argon ([99.9999 %). The furnace chamber was evacuated and filled for the three times prior to each measurement to avoid decarburization and oxidation of steel samples, which occur at high temperatures in the presence of residual oxygen [19]. Pure titanium chips were put into the furnace chamber for additional purification of the atmosphere.…”

Section: Experimental Conditionsmentioning

confidence: 99%

Differential scanning calorimetry study of peritectic steel grades

Wielgosz

Kargul

2014

J Therm Anal Calorim

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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.

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“…Material solidification, the grain size, chemical heterogeneity and the existence of incompactness can have negative influences on the properties of the final material. 1 A relatively big homogeneity of the distribution of sulphur and other elements and also the absence of thick segregate areas in the whole cross-section are due to the fast solidification of the billet. The range and removal of impurities are mainly connected with the contents of phosphorus and sulphur in the steel, the steel temperature and also the intensity of the billet cooling.…”

Section: Introductionmentioning

confidence: 99%

Study of macro-segregations in a continuously cast billet

Socha¹,

Vodárek²,

Michalek³

et al. 2017

Mater. tehnol.

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This paper is devoted to the study of macro-segregations on the longitudinal section of a continuously cast billet Ø 160 mm destined for the production of seamless pipes. Its evaluation comprised a visual inspection of macro-etching, microstructure characterisation and a quantitative X-ray microanalysis by means of an energy-dispersive X-ray microanalysis (EDX) in the selected areas. Furthermore, segregation parameters were calculated using combustion-analysis data. The results given in this paper present the basic information about the interior structure of a continuously cast billet. The results will be used, beside other things, for the verification of the results of the numerical modelling of continuously cast billets. Keywords: steel, macro-segregation, continuous casting, round billet Ta~lanek obravnava {tudij makro-izcej na vzdol`nem prerezu kontinuirno ulite gredice Ø 160 mm namenjene za proizvodnjo brez{ivnih cevi. Ocena je sestavljena iz vizuelnega pregleda po makrojedkanju, iz ocene in kvantitativne rentgenske mikroanalize s pomo~jo energijsko disperzijske rentgenske analize (EDX) izbranih podro~ij. Izra~unani so bili tudi parametri izcejanja s pomo~jo podatkov zgorevne analize. Rezultati, prikazani v tem~lanku, predstavljajo osnovno informacijo o notranji strukturi v kontinuirno uliti gredici. Rezultati bodo uporabljeni, poleg drugega, tudi za preverjanje rezultatov numeri~nega modeliranja kontinuirno ulitih gredic.

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Experimental study of Fe–C–O based system above 1,000 °C

Cited by 9 publications

References 2 publications

Prediction and measurement of selected phase transformation temperatures of steels

Prediction and measurement of selected phase transformation temperatures of steels

Differential scanning calorimetry study of peritectic steel grades

Study of macro-segregations in a continuously cast billet

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