engleski

INFLUENCE OF QUENCHING OILS COMPOSITION ON THE COOLING RATE

Quenching media are applied on heat treatment processes of materials in order to achieve specific properties. By correct selection of adequate quenchant the risk of tensile stresses, and also of cracking and workpiece distortions, is decreased. By a constant development of quenchants, environment and human protection and safety requirements are the factors, which directly influence the quenching medium composition. The composition of modern formulations is becoming more and more sophisticated so that a great deal of usual components is changing with new less harmful substances. High-performance quench oil must have oxidation and thermal resistance, be nonstaining, and have an elevated flash point, decreased volatility and acceptable heat-transfer characteristics. By changing quenching oils composition, base oils and additives, cooling rate also is changing. In this paper are presented examination results of physical-chemical properties of new quenching oil formulations and also their cooling rates.

hardening; cooling properties; quenching oils; additives

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