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Properties of different compositions of oils as quenchants (CROSBI ID 179365)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Matijević, Božidar ; Župan, Josip ; Pedišić, Ljiljana Properties of different compositions of oils as quenchants // International heat treatment and surface engineering, 6 (2012), 1; 15-18. doi: 10.1179/1749514811Z.0000000007

Podaci o odgovornosti

Matijević, Božidar ; Župan, Josip ; Pedišić, Ljiljana

engleski

Properties of different compositions of oils as quenchants

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.

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

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Podaci o izdanju

6 (1)

2012.

15-18

objavljeno

1749-5148

1749-5156

10.1179/1749514811Z.0000000007

Povezanost rada

Kemijsko inženjerstvo, Metalurgija, Strojarstvo

Poveznice
Indeksiranost