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Vol 14, Issue 1, 2023
Pages: 91 - 97
Research article
Metallic materials
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Published: 01.05.2023. Research article Metallic materials

EFFECT OF MIXING OF COOLING MEDIA ON MICROSTRUCTURE AND HARDNESS OF STEEL 23MnB4

By
Almaida Gigovic-Gekic ,
Almaida Gigovic-Gekic
Contact Almaida Gigovic-Gekic

Faculty of Engineering and Natural Sciences, University of Zenica , Zenica , Bosnia and Herzegovina

Hasan Avdušinović ,
Hasan Avdušinović

Faculty of Engineering and Natural Sciences, University of Zenica , Zenica , Bosnia and Herzegovina

Amna Hodzić ,
Amna Hodzić

Faculty of Engineering and Natural Sciences, University of Zenica , Zenica , Bosnia and Herzegovina

Branka Muminović
Branka Muminović

Institute "Kemal Kapetanović" in Zenica, University of Zenica , Zenica , Bosnia and Herzegovina

Abstract

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.

References

1.
Steel Heat Treatment Handbook: Steel Heat Treatment Metallurgy and Technologies. 2006.
2.
E K. Thelning: Steel and its heat treatment. 1984.
3.
Gigović-Gekić A, H. Avdušinović: Termička obrada metala, Praktikum s teorijom, Univerzitet u Zenici. 2019;
4.

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