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Effect of Heating Atmosphere on the Spectral Emissivity of the Usibor® 1500P Steel During Austenitization

[+] Author Affiliations
C. J. Shi, K. J. Daun, M. A. Wells

University of Waterloo, Waterloo, ON, Canada

Paper No. IMECE2015-50475, pp. V08BT10A035; 12 pages
doi:10.1115/IMECE2015-50475
From:
  • ASME 2015 International Mechanical Engineering Congress and Exposition
  • Volume 8B: Heat Transfer and Thermal Engineering
  • Houston, Texas, USA, November 13–19, 2015
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5750-2
  • Copyright © 2015 by ASME

abstract

Variations in spectral emissivity of Usibor® 1500P steel during a two-step austenitization and in two different heating atmospheres, argon and air, are measured in-situ using a near infrared spectrometer and ex-situ with a Fourier transform infrared reflectometer. Phase transformations of the Al-Si coating and surface oxidation lead to the changes in surface phase composition and surface roughness, which in turn influences the spectral emissivity. In the first step heating at 610°C, the abrupt increase of spectral emissivity in argon and air is due to the transformation of the Al-Si metallic surface into the Al7Fe2Si intermetallic surface and an increase in surface roughness. Through the second step heating at 900°C, the progressive decrease of spectral emissivity with soak time in argon is caused by the surface phase transformation from Al5Fe2 into AlFe with a decrease in surface roughness. In contrast, surface oxidization with an increase in surface roughness significantly increases the spectral emissivity after two minutes soaking in air.

Copyright © 2015 by ASME
Topics: Steel , Emissivity , Heating

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