Abstract
To control the process of film boiling during quenching in oils, quench oil makers as a rule manipulate physical properties such as a surface tension and viscosity. However, there is much experimental data showing that special additives can eliminate film boiling in oils without changing their physical properties and which is counterintuitive. Authors explain such phenomenon by showing that the addition of a special additive, for example PIB (polyisobutylene polymer), will create an insulating layer on the surface of steel parts during quenching in oils that will eliminate film boiling without affecting physical properties of the oil. Insulating layer decreases initial heat flux density which becomes less than critical one and of the oil will not begin film boiling during quenching with the PIB additive. Authors believe that such approach will allow engineers to solve effectively the problem of part distortion after quenching. The new oil quenchant containing special additive PIB is patented in Ukraine and is manufactured by Barkor Ltd for needs of the heat treating industry.
Highlights
In the paper a patented technology is discussed [1]
In 1987 authors proposed an original idea [2] on the possibility of eliminating film boiling during quenching by creating an insulating layer on the surface of steel parts to be hardened
Authors of an original investigation [5] reported on the possibility to eliminate film boiling completely during quenching in mineral oil I-20A if PIB-2400 in amount of 3 % is added to mineral oil
Summary
In the paper a patented technology is discussed [1]. In 1987 authors proposed an original idea [2] on the possibility of eliminating film boiling during quenching by creating an insulating layer on the surface of steel parts to be hardened. The invented process was rather costly that is why the (2016), «EUREKA: Physics and Engineering» Number 3 author [3, 4] proposed to use small concentration of inverse solubility polymers in water which create micro layer on the surface during the beginning of the quench cooling process. In this case technology becomes significantly cheaper resulting in decreased distortion of the steel parts after quenching. The aim of this paper is to find out a reason for elimination of film boiling when PIB-2400 in oil is present by exploring the previous studies of the authors [2,3,4]
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