About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Metallic Coated Advanced Steels
|
| Presentation Title |
Correlation Between Surface Topography and Radiometric Properties During Galvannealing |
| Author(s) |
Michiyo Kagaya, Fatima Suleiman, Ana Paula Domingos Cardoso, Kyle Daun |
| On-Site Speaker (Planned) |
Michiyo Kagaya |
| Abstract Scope |
Precise temperature control is crucial for obtaining an intermetallic coating with the optimal phase composition and desired properties in the galvannealing process. Unfortunately, the rapid coating transformation both in terms of phase and topography affects the in-situ radiative properties and complicates inline pyrometry. Recent study has shown that in-situ spectral emissivity varies linearly with wavelength over the long-wavelength infrared spectrum. The slope decreases as coating evolves, possibly due to change in morphology. To examine the correlation, in-situ emissivity measurements are made on a specimen heated within a galvannealing simulator using a hyperspectral camera. Ex-situ radiometric properties, surface topography, and microscopy of samples quenched at different stages of the process are also studied using FTIR spectrometer, digital optical microscope, and SEM, respectively. The plausibility of predictive models for radiative properties and possible improvement for inline pyrometry for galvannealing are discussed. |