KAMAZ (Naberezhnye Chelny, Russia)

D. A. Gurtovoy, Cand. Eng., Consultant to the Deputy General Director for Automotive Components

Yaroslavl State Technical University (Yaroslavl, Russia)
A. G. Panov, Dr. Eng., Associate Prof., Prof., Dept. of Materials Technology, Standardization, and Metrology, Doctor of Engineering Sciences, panov.ag@mail.ru

This article addresses a fundamental and practically significant problem in the research of cast iron melt structure formation processes, with a particular emphasis on the construction of kinematic viscosity polytherms for melts of Compacted Graphite Iron (CGI). The complexity of the research subject lies in the heterogeneity of the metallic matrix and graphite with different morphology, the kinetics of the transformation of which under high-temperature exposure directly influence the system’s rheological behavior. The article analyzes the information available in the scientific literature concerning the kinematic viscosity polytherms for various cast iron types. The outcomes of this analysis have enabled the identification of knowledge gaps pertaining to CGI as they currently stand, and have pinpointed the most promising avenues for future research. The authors present their own measurement results for the viscosity of CGI melts during heating and cooling. Particular attention was paid to the influence of the experimental methodology on the nature and numerical values of polytherm hysteresis. It has been revealed that the specific experimental protocols and statistical processing approaches employed can significantly impact the interpretation of the nature and precise numerical values of the hysteresis phenomenon. This underscores the critical need for standardization of methodologies and a critical approach to analyzing existing data in scientific literature.

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