Abstract
This paper presents the results of metallographic research studies carried out for stock materials as well as the samples collected from the balls formed in the rolling process in a skew rolling mill. The stock material was bearing steel 100Cr6 and the steel from rail scrap. The rolling process was carried out in parallel for the two assumptions: the conventional method (hereinafter referred to as conventional rolling) and the modified method (hereinafter referred to as modified rolling). After the rolling process, three cooling media were used: air, water and oil. The pictures below, which depict microstructures, were taken using the bright-field and the dark-field microscopy technique, the samples were etched with a 4% solution of picral.
Highlights
Mass-scale production of steel balls, which are used as grinding media in various types of ball mills, forces producers to search for new technologies with greater efficiency and lower production costs
The skew rolling process of steel balls was carried out for the two different stock materials: bearing steel (100Cr6) and the steel obtained from rail heads and two different methods of tool calibration
From the images of microstructures of the bearing steel 100Cr6 (Fig. 3), it is visible in the stock material that it has been subjected to spheroidizing annealing
Summary
ORCID: 0000-0001-5159-6746 Faculty of Mechanical Engineering and Robotics University of Science and Technology in Kraków.
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