AUTHORS: Petro Lohvynenko, Anatolii Moskalenko, Nikolai Kobasko, Larisa Karsim, Sergii Riabov
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ABSTRACT: It has been shown by authors that an addition of the special additive to mineral quench oils for example a polyisobutylene oligomer (PIB), creates an insulating layer on the surface of steel parts during quenching. This insulating layer eliminates the film boiling process on the part surface without affecting physical properties of the oil. The insulating layer decreases an initial heat flux density which becomes less than critical one. The paper presents results of the detailed investigations of the mechanism of the film boiling elimination or its cardinal decreasing due to a presence the small amount of the PIB in mineral oils. Experiments were conducted using an Inconel 600 probe of 10 mm in diameter and 30 mm long, which was quenched from 810o C in Industrial oils (I-8A, I-12A and I-20A). An effect of the oil viscosity and molecular weight of the PIB was investigated by authors. It was shown that by eliminating of the film boiling during quenching, it is possible to govern the intensity of cooling and to provide a uniformity of the hardening process. A phenomenon on eliminating of the film boiling process due to a presence of the small amount of the PIB in the mineral oil is called an EFB effect, which has an important practical use
KEYWORDS: PIB oligomeric additives, film boiling elimination, mechanism, uniformity, EFB effect.
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