The effect of crystallization conditions (during casting in a copper chill mold, cast iron mold, and with ingot preparation by high-gradient directional crystallization) of high-strength deformable wear- and corrosionresistant alloy based on nickel-copper grade VKM1 (NMKZhMts-30-4-2-1-VI) on grain size in final semifinished product is studied, i.e., extruded bar with an identical heat treatment regime. It is shown that ingot casting in a cast iron mold provides preparation of a dense original ingot with coarse eutectic fragment precipitates that do not dissolve entirely on heating for extrusion, they initiate development of a considerable amount of slip planes during extrusion, and on quenching delay grain growth. This provides formation of a more fine-grained structure compared with metal cast in a copper chill mold and that obtained by high-gradient directional crystallization.
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Translated from Metallurg, No. 8, pp. 77–81, August, 2013.
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Evgenov, A.G., Kalitsev, V.A. & Rogalev, A.M. Effect of Siliceous Monel VKM1 Crystallization Conditions on Extruded Semi-Finished Product Structure. Metallurgist 57, 736–741 (2013). https://doi.org/10.1007/s11015-013-9794-x
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DOI: https://doi.org/10.1007/s11015-013-9794-x