Influence of Quenching Oils Composition on The Cooling Rate
Lj. Pedišić, B. Matijević, B. Perić:
INFLUENCE OF QUENCHING OILS COMPOSITION ON THE COOLING RATE,
1st International conference on heat treatment and surface engineering of tools and dies, IFHTSE 2005 (08 – 11 June 2005, Pula, Croatia)
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. Environment, human protection and safety requirements are the factors which directly influence the development of qenchants, i.e. the quenching medium composition. The composition of modern quenchants is becoming more and more sophisticated so that a great deal of usual components is replaced with new, less harmful substances. High-performance quench oils must have the following properties: oxidation and thermal resistance, elevated flash point, decreased volatility and acceptable heat-transfer characteristics. By changing the composition of quenching oils, base oils and additives, the cooling rate is also changed. The examination results of physical-chemical properties of new quenching oil compositions and also their cooling rates are presented in this paper.