Study of the formation of the skin in meniscus free continuous casting. II. Mechanisms of formation of marks

In order to find the origin of the surface marks in meniscus free continuous casting, an experimental work has been carried out with two different experimental devices using metallic alloys and transparent organic compounds respectively. In a first companion paper, we showed the results of the observation of the samples obtained with the two devices. Here, we present the results of the direct observation of the solidification phenomena. These results permit us to propose a microscopic model of the formation of the marks.