Possibilities of complex experimental study of thermophysical and thermodynamic properties of selected steels

Řeháčková, Lenka; Novák, Vlastimil; Smetana, Bedřich; Matýsek, Dalibor; Váňová, Petra; Drozdová, Ľubomíra; Dobrovská, Jana

doi:10.1016/j.jmrt.2019.06.001

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…Experimental measurement of melting and softening temperature was performed in a resistance observation furnace Clasic enabling measurement in a low vacuum of < 8•10 -3 mbar [10]. Agglomerate samples were placed in the furnace, which was then hermetically sealed, evacuated to approximately 0.1 Pa and flushed with argon gas (> 99.9999%).…”

Section: Measurement Of Thermoplastic Propertiesmentioning

confidence: 99%

Experimental study of thermoplastic properties of agglomerate

Novák

Řeháčková

Klus

et al. 2020

METAL 2020 Conference Proeedings

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Traditional routes of ironmaking and steelmaking processes demand high-temperature preparatory steps, such as coking and sintering. These processes are of great concern since they represent a considerable environmental burden. As an alternative, carbon-containing iron oxides agglomerates (sinters) can be used. In this work, the assessment of thermoplastic properties of prepared sinters, especially the determination of softening and liquidus temperatures, was performed by two methods: optical and spindle drop method. For the first-mentioned method, high-temperature observation furnace CLASIC was employed, which enables observation of changes in specimen shape depending on temperature. While in the case of the second method, Furnace Rheometer System FRS 1600 was used. This system allows measuring changes of spindle height as a function of temperature when different normal forces, in specific 3 and 20 N, are applied. Besides, analyzed sinters were of different grain sizes and contained approximately 59 wt.% of iron and 7.2 wt.% of iron(II) oxide. The samples were measured up to liquidus temperature at various heating rates in an inert atmosphere of argon gas. In summary, a good agreement between phase transformation temperatures measured by both methods was achieved, and the influence of experimental conditions on these temperatures was confirmed.

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Section: Measurement Of Thermoplastic Propertiesmentioning

confidence: 99%

Experimental study of thermoplastic properties of agglomerate

Novák

Řeháčková

Klus

et al. 2020

METAL 2020 Conference Proeedings

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“…Thermophysical and thermodynamic properties of systems based on Fe were and still are a subject of extensive research [1][2][3]. To predict thermophysical and thermodynamic material properties of complex systems, it is necessary, to have a high quality of experimental data of simpler systems such as Fe-C-O-Cr, Fe-C-O-Ni or Fe-C-O-Cr-Ni [4,5]. The key material data required for the thermodynamic and thermophysical description of materials include the phase transformation temperatures, thermal expansion coefficient, density and others [3,5].…”

Section: Introductionmentioning

confidence: 99%

dilatometry Analysis of FeCCrNi based systems

Drozdová

Smetana

Machů

et al. 2020

METAL 2020 Conference Proeedings

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Three model alloys based on Fe-C-Cr-Ni were studied. Alloys contained 0.34 -0.36 wt. % of carbon and chromium and nickel in the range of 1.04 -4.96 wt. %. Thermal expansion coefficient and density were studied in the temperature range of 200 -1600 °C. Temperatures of phase transformations in the low and high-temperature area were evaluated too. The experimental data were obtained using dilatometry. The NETZSCH DIL 402 Expedis Supreme with NanoEye, the optoelectrical displacement system, was used for experiments. Measurements were done in an inert atmosphere of pure helium by a heating rate of 10 °C/min. The experimental data were compared and discussed with the calculation results using SW Thermo-Calc with implemented Fe-based alloys database TCFE8.1 and SW JMatPro with implemented General steel database. The influence of various contents of chromium and nickel was studied.

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Multiphase Field Modeling of Dendritic Solidification of Low-Carbon Steel with Peritectic Phase Transition

Yang

Luo

Wang

et al. 2021

Metall Mater Trans B

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In the present study, an improved multiphase field model with taking into consideration the S/L interface anisotropy is proposed to simulate the dendritic growth with peritectic transition of low-carbon steel, and a new random heterogeneous nucleation method is proposed to treat the c phase nucleation during the peritectic solidification process. The c phase growth around the dendrite (the single dendrite and polycrystalline ferrite) and the subsequent peritectic transformation during the peritectic solidification are simulated. The results show that when the temperature reaches the c phase nucleation temperature, c nuclei suddenly nucleate at the d/ L interface, and laterally grow with the movement of L/c/d triple point around the d/L interface of d dendrite. After the d dendrite is fully wrapped by the continuous intervening c phase, the c phase continues to grow with direct phase transformation from both d phase and liquid phase. With the increase of melt undercooling, more d phase and liquid phase are consumed to form c phase, and the intervening c phase between the d dendrite and liquid phase becomes more and more thick, but the d dendrite arm becomes more and more thin. During the dendritic solidification process, the solute would be rejected from dendrite trunk with the dendritic growth and enriched at the dendrite boundary, especially at the dendrite root. The solute enrichment at the dendrite root would inhibit the c phase growth at the dendrite root and thus the thickness of intervening c phase at the dendrite root is thinnest around the dendrite. Moreover, the solute concentration in c phase is among the d phase and liquid phase, because the carbon solubility in c phase is higher than that in d phase, but lower than that in liquid phase.

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Possibilities of complex experimental study of thermophysical and thermodynamic properties of selected steels

Cited by 5 publications

References 26 publications

Experimental study of thermoplastic properties of agglomerate

Experimental study of thermoplastic properties of agglomerate

dilatometry Analysis of FeCCrNi based systems

Multiphase Field Modeling of Dendritic Solidification of Low-Carbon Steel with Peritectic Phase Transition

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