Karaganda State Technical University (Karaganda, Kazakhstan):

A. Z. Isagulov, Dr. Eng., Prof., First Vice-Rector, e-mail: a.isagulov@kstu.kz
Sv. S. Kvon, Cand. Eng., Prof., Dept. of Nanotechnology and Metallurgy, e-mail: svetlana.1311@mail.ru
V. Yu. Kulikov, Cand. Eng., Prof., Dept. of Nanotechnology and Metallurgy, e-mail: mlpikm@mail.ru
D. R. Aubakirov, Mag. Sci., Senior Lecturer, Dept. of Nanotechnology and Metallurgy, e-mail: dastan_kstu@mail.ru

The work is devoted to the study of the relationship of chemical composition and structure with the operational properties of grinding balls. Grinding balls were made from the experimental chrome wearresistant cast iron. It was additionally alloyed by nickel and titanium but the chromium concentrate was decreased. Balls of wear-resistant cast iron ICh 28 grade were used as a witness sample. The relevance of the study is due to the low toughness of the balls from 28, which leads to their failure not so much as a result of wear of the surface, but as a result of chips and chips. The nickel was alloyed to increase the toughness of the matrix, titanium was alloyed to form MeC type carbides, because the presence of carbides of this type in the structure is preferable to cementitious carbides. The data on the analysis of the microstructure of balls smelted from experimental cast iron are presented. Investigations of stress fi elds in the samples were carried out in order to determine casting defects. Grinding balls made of experimental cast iron were tested under industrial conditions with coarse grinding of manganese ore. The tests lasted for 14 hours, then a yield analysis was performed. The tests showed that the experimental balls are less prone to chips and generations, although surface wear in the experimental samples is slightly higher. However, in general, the quality of experimental balls has increased by 13–15% if to compare with the ordinary balls.
These studies were carried out as part of the implementation of targeted funding by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan BR05236295 “Creation, development and implementation of technologies for production and processing of wear-resistant materials of a new generation to obtain parts of metallurgical units”.

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