Abstract
Since consumable-electrode arc-melting is carried out at a high temperature in vacuum, some alloying elements of high vapor-pressure should evaporate in this method. In many meltings the Mn content is decreased clearly, but the contents of Cu and Sn, which show a high vapor-pressure next to Mn, is not decreased noticeably. Analyses of adhered substances on the wall of a crucible make clear that the Cu and Sn also evaporate, elements remelt into molten pool as the melting proceeds is ascertained by pulling-down and a pulling-down arcmelting shows that the evaporated elements remelt into molten pool as the melting process goes on. It should be one reason for that Cu and Sn is not decreased noticeably.
Durations of molten state under various melting conditions calculated from the shapes of molten pools are found to be rather short. Therefore the molten metal shall be solidified before various reactions will have completed.
