Ermittlung der spezifischen Wärmekapazität mittels HT-DSC von höher legierten Stählen

Translated title of the contribution: Determination of specific heat capacity of high alloyed steels by HT-DSC

Belinda Gruber

Research output: ThesisMaster's Thesis

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Abstract

The most commonly used method for determining the specific heat capacity is the Differential Scanning Calorimetry (DSC). This measuring device enables continuous measurements of the specific heat capacity over a large temperature range with short analysis times. All cp-measurements in this thesis were performed on a heat flux DSC (type: Netzsch DSC404 Pegasus F1) by the standardized sapphire method according to ASTM E1269-11. Through an own method improvement the best measurement settings have been determined to analyse steels up to high temperatures. Thereby the performed measurements achieved a combined measurement uncertainty of 1.7% or 0.012J/(g*K) at 600°C, 2.5% at 800°C or 5.4% at 1000°C. In the practical part cp-measurement of selected binary Fe-Si, -Al, -Mn model alloys and various industrial alloys were performed up to 1050°C and compared with ThermoCalc (TCFE7) and FactSage (SGTE2014). The single-phase regions (ferrite or austenite) of the binary alloys are very well described by the thermodynamic programs. Thermodynamic calculations correspond in the single-phase regions with pig iron, as well as with the alloys TRIP, TWIP, HS2-9-1-8, X40CrMoV5-1 and X15CrNiSi25-20. The largest deviations of 10 to 20% are observed within the austenitic steel X1CrNiMoCuN20-18-7 and the valve steel (1.4882).
Translated title of the contributionDetermination of specific heat capacity of high alloyed steels by HT-DSC
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Presoly, Peter, Co-Supervisor (internal)
  • Bernhard, Christian, Supervisor (internal)
Award date18 Mar 2016
Publication statusPublished - 2016

Bibliographical note

embargoed until null

Keywords

  • Differential Scanning Calorimetry (DSC)
  • specific heat capacity
  • measurement settings
  • combined standard uncertainty
  • high alloyed Fe-C-Si-Mn-Al steels
  • ThermoCalc
  • FactSage

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