Naslov
Properties of different compositions of oils as quenchants

Autori
Matijević, Božidar ; Župan, Josip ; Pedišić, Ljiljana

Izvornik
International heat treatment and surface engineering (1749-5148) 6 (2012), 1; 15-18

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
heat treatment; hardening; oils; quenchants; quenchant additives; cooling rate

Sažetak
Quenching is the most common method of hardening metals, which involves continuous cooling from a given austenite temperature to achieve full transformation into martensite structure. The cooling rate mainly depends on thermal characteristics of metals, section thickness of workpieces, and the quenching medium heat-removal properties. Oils as quenching media contain a base oil and different types of additives according to application requirements. As the base oil, it is possible to use mineral oils, synthetic and natural oils, either separately or in combination. Mineral base oils are widely used because of their advantages in stability in comparison to natural oils, or lower prices in comparison to synthetic oils. There are numerous additives available for use but, besides functional properties, the environmental and safety requirements have to be considered in the selection of additives, e.g. barium additives must be replaced with less harmful compounds. Petroleum derivatives should be replaced with renewable base stocks that are biodegradable, which is a general trend in lubricant development. By changing the composition of quenching oils, base oils and additives, heat transfer characteristics are also changed. This study presents results of the analysis of physical and chemical properties, as well as of cooling characteristics of new quenching oils with different compositions. Cooling curves for different compositions have been evaluated according to ISO standard 9950.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Metalurgija, Strojarstvo

POVEZANOST RADA