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Faculty of Engineering and Natural Sciences, University of Zenica , Zenica , Bosnia and Herzegovina
Faculty of Engineering and Natural Sciences, University of Zenica , Zenica , Bosnia and Herzegovina
Faculty of Engineering and Natural Sciences, University of Zenica , Zenica , Bosnia and Herzegovina
Institute "Kemal Kapetanović" in Zenica, University of Zenica , Zenica , Bosnia and Herzegovina
Steel cooling is an important technological operation because the final microstructure of the steel,
and therefore its properties, depends on the cooling rate. The speed of steel cooling depends on
numerous factors, one of which is the movement of the cooling media. This paper presents the
results of testing the influence of mixing the cooling media on the microstructure and hardness of
23MnB4 steel. Two media that are usually used for quenching steel (water and oil) were used for
the test. The samples were cooled in an unstirred media and in a stirred media with three different
stirring speeds (500, 750, and 1000 rpm). The results showed that mixing the media has an influence
on the microstructure and hardness of steel. Samples that were cooled in a mixed medium had a
higher hardness. The mixing speed had a greater influence on the hardness in the case of cooling
in water. The microstructure after cooling in the water and oil was martensite-bainite. With an
increasing cooling rate, the ratio of martensite in microstructure increases.
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