Abstract
In this article, an attempt is made to describe the mechanism for the formation of solute-lean white spot defects in vacuum-arc remelted ingots. The new explanation includes falling to the pool of metal pieces that are not necessarily different in composition from base metal. The residues of these pieces that survive on their way to the deep regions of the pool serve as nuclei for an equilibrium atom-exchange process between solid and liquid phases, which leads to the selective solute depletion at their boundary. The width of layers thus formed depends on the solid-liquid phase contact time.
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References
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Shved, F.I. An analysis of the mechanism of white spot formation. JOM 46, 36 (1994). https://doi.org/10.1007/BF03222534
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DOI: https://doi.org/10.1007/BF03222534