Abstract
Studies of the crystalline structure of the precipitation cone in large forging-grade ingots show that the settling cone has a zonal structure that describes all ingots studied’ independent of the ingot geometry and parameters of the pour process. Increasing the bulk crystallization factor facilitates accelerated movement of the vertical hardening front’ which moves the defect zones into higher-level horizons and improves the replenishment of axial defects in the ingot. Development of measures to increase the number of phase nuclei (using stream inoculation during ingot pours’ and pouring of additional material at the head of the casting) enables the production of ingots with a more homogeneous structure by reducing the propagation depth of axial defects and reducing the extent of the arc crack zone.
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Translated from Metallurg’ No. 4’ pp. 67–70’ April’ 2008.
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Poslamovskaya, Y.A., Zhul’ev, S.I. Formation characteristics of the lower part of large forging-grade ingots of Cr-Ni-Mo steels. Metallurgist 52, 253–258 (2008). https://doi.org/10.1007/s11015-008-9042-y
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DOI: https://doi.org/10.1007/s11015-008-9042-y