Metals (Apr 2020)

Investigation of Thermophysical Properties of Three Barrel Steels

  • Piotr Koniorczyk,
  • Janusz Zmywaczyk,
  • Andrzej Dębski,
  • Mateusz Zieliński,
  • Marek Preiskorn,
  • Judyta Sienkiewicz

DOI
https://doi.org/10.3390/met10050573
Journal volume & issue
Vol. 10, no. 5
p. 573

Abstract

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In this paper, thermal diffusivity and heat capacity measurements were performed for three types of barrel steel, 38HMJ (1.8509), 30HN2MFA, and duplex (1.4462). Thermal diffusivity tests as a function of temperature were performed in the range of room temperature (RT) to 500 °C, and specific heat in the range of RT to 1000 °C. All tests were carried out using NETZSCH specialized measuring stands: LFA 467 light flash apparatus and DSC 404 F1 Pegasus differential scanning calorimeter. In the measurements of thermal diffusivity, the reference material Inconel 600 was used. This made it possible to determine thermal conductivity and specific heat as a function of the temperature of barrel steel. The results of specific heat tests of the 38HMJ and the 30HN2MFA steels show a ferrite–austenite phase transition in the 750–810 °C temperature range. This transition was not observed in the duplex steel.

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