Evolution of the Spectral Emissivity and Phase Transformations of the Al-Si Coating on Usibor ® 1500P Steel During Austenitization
作者： Cangji Shi , Kyle J. Daun , Mary A. Wells
DOI: 10.1007/S11663-016-0791-X
关键词: Optical microscope 、 Profilometer 、 Emissivity 、 Infrared 、 Coating 、 Materials science 、 Surface roughness 、 Intermetallic 、 Metallurgy 、 Phase (matter)
摘要: Usibor® 1500P coupons are austenitized in a Gleeble 3500 thermomechanical simulator using two-step heating procedure an argon atmosphere. Variations spectral emissivity measured in-situ near infrared spectrometer and ex situ with Fourier transform reflectometer. Microstructural evolution surface roughness investigated optical microscopy, FE-scanning electron profilometer. A series of phase transformations Al-Fe-Si intermetallic phases at the coating/steel substrate interface cause to change, which turn influences emissivity. At beginning first step, have very low emissivity, due molten Al-Si coating. Spectral increases significantly increasing soak time from 5 12 minutes, associated transformation coating into Al7Fe2Si increase roughness. Through second step 1173 K (900 °C), shows gradually decreasing trend time, caused by Al5Fe2 AlFe decrease
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