|About this Abstract
||MS&T21: Materials Science & Technology
||Advances in Ferrous Metallurgy
||Radiative Properties of Al-Si Coated 22MnB5 Steel
||Cameron Klassen, Boxuan Zhao, Kyle Daun
|On-Site Speaker (Planned)
Hot stamping of aluminum-silicon (Al-Si) coated 22MnB5 steel blanks is used to produce light and crashworthy vehicle components. Accurate blank heating models are needed to maximize production rates while ensuring the parts are sufficiently austenitized. The heat absorption of the blanks is governed by their radiative properties, which evolve as the Al-Si coating liquefies and transforms into a rough intermetallic layer. However, the connection between surface morphology and radiative properties is poorly understood. This paper presents in-situ emissivity measurements obtained using a Fourier-transform infrared reflectometer equipped with a heated measurement stage, which are compared to ex-situ reflectometer measurements for samples heated in a muffle furnace and quenched at intermediate times, as well as optical roughness profilometry and scanning electron microscope images. The results elucidate the evolving surface characteristics of the steel and provide valuable insight to hot stamping practitioners.