Investigation of the Effect of the Temperature of the Poured Melt in the Profitable Part of the Ingot on the Solidification Process and Structure Formation

The paper presents the results of a laboratory study of the solidification process and the development of structural zones in ingots when refilling the profitable part with melt, 19 minutes after pouring the ingot body and at different temperatures of the refilled melt (Tz. t.sl. = 75 °C; Tz. ave. = 70 °C; Tz. ave. = 75 °C; Tz. ave. = 80 °C). The research was carried out by the method of physical (cold) modeling, on a flat model of a mold (mold-crystallizer). As an analogue, a scale model of a forge ingot weighing 19.6 tons is taken. A five-aqueous solution of sulfuric acid sodium (Na2S2O3∙5H2O) was used as a modeling solution. The melt was poured into the mold mold from above. This work was carried out in continuation of previously published works on the study of the influence of differentiated casting technology on the process of solidification and structure formation of zones in forging ingots. The paper establishes the effect of refilling the profitable part of the ingot with melt on the dynamics of thermal processes occurring during the crystallization of the ingot. It is determined that the total crystallization time increases for model ingots cast with refilling of the profitable part with melt. It is shown that refilling the melt into profit contributes to the suppression of the volumetric solidification mechanism and promotes the development of a zone of columnar crystals solidifying by a sequential mechanism.