The niobium effect on the structure and properties of cast iron ChH16

Tulepova M.A. Kvon Sv.S. Okishev K.Yu. Alina A.A.
2025 Ore and Metals Publishing house

CIS Iron and Steel Review
2025 #30 37 - 40 pp.

This study investigates the effect of a 1 % niobium addition on the microstructure and properties of high-chromium cast iron ChH16. Thermodynamic modeling using the ThermoCalc software and the TCFE13 database demon strated that niobium promotes NbC carbide formation, with its precipitation occurring most actively in the 1000 600 °С range. The experimental results confirm that niobium refines the cementite structure, increasing hardness and wear resistance without significantly reducing bending strength. Comparative analysis of ChH16 alloyed with 1 % Nb and ChH32 indicates that the experimental alloy offers improved wear performance while maintaining mechanical integrity. Microstructural analysis using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) revealed that NbC carbides are distributed uniformly throughout the matrix. This contributes to enhanced wear resistance due to their high hardness and stability. Hardness and wear tests confirmed an increase in wear resistance comparable to that of ChH32, while the bending strength remained unchanged, making the mate rial suitable for applications involving abrasive and impact loads. Additionally, the formation of niobium carbides fa cilitates chromium retention in the matrix, suggesting improved heat resistance. These findings suggest that ChH16 with 1 % Nb is a promising material for mining and metallurgical equipment components subjected to severe wear conditions and high temperatures.

hardness , high-chromium cast iron , microstructure , niobium alloying , toughness , wear resistance

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Abylkas Saginov Karaganda Technical University, Department of Metallurgy and New Materials, Karaganda, Kazakhstan
Ural Federal University named after the First President of Russia B. N. Yeltsin, Department of Heat Treatment and Physics of Metals, Ekaterinburg, Russian Federation

Abylkas Saginov Karaganda Technical University
Ural Federal University named after the First President of Russia B. N. Yeltsin

10 лет помогаем публиковать статьи Международный издатель

Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026