Microstructure of Fe-B-Si Alloy Surface Layers Produced by Laser-Quenching

Publisher Website
Google Scholar
Abstract
Laser-quenching was performed to produce an amorphous alloy layer on metal blocks. Fe78B13Si9 alloy film brazed onto the surface of a stainless steel plate was melt-quenched by pulsed YAG or cw CO2 laser irradiation. Transmission electron microscope and high-resolution electron microscope observations were carried out to study the microstructure of the laser-quenched layers. In both cases, at the region very close to the free surface in the laser-quenched layer, amorphous and crystalline phases were observed. The internal area of the pulsed YAG laser-quenched layer consisted of an amorphous phase including a small amount of nanometer-size crystalline particles, while that of the cw CO2 laser-quenched layer consisted of mainly an amorphous single phase, partially including heat-affected zones in the neighborhood of the overlapped area of laser irradiation.