The influence of quenchant composition on cooling rate

Pedišić, Ljiljana and Matijević, Božidar and Munić, Jasminka (2011) The influence of quenchant composition on cooling rate. = The influence of quenchant composition on cooling rate. Strojarstvo, 53 (1). pp. 53-61. ISSN 0562-1887. Vrsta rada: Original scientific paper. . .

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Abstract

Correct selection of quenching media decreases the risk of tensile stresses, and also cracking and workpiece distortion. High-performance quenching oil must have excellent oxidation and thermal resistance and low sludge formation, must be non-staining and have an elevated fiash point and acceptable heat-transfer characteristics. The quenching media contain 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 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 compounds available for use but, besides functional properties, the environmental and safety requirements have a strong influence on components selection. Based on that the barium additives must be replaced with less harmful compounds. Petroleum derivatives should be changed with renewable base stocks that are biodegradable, as the general trend in lubricant development. By changing the composition of quenching oils, base oils and additives, heat transfer characteristics are also changed. In this study the examination results of physical-chemical properties and also cooling characteristics of new quenching oils with different compositions are presented. Cooling curves for different compositions have been evaluated according to ISO 9950 standard.

Item Type:	Article (Original scientific paper)
Keywords (Croatian):	Application requirements; Base oil; Base stock; Cooling characteristics; Cooling curve; Cooling rates; Functional properties; General trends; Harmful compounds; Heat transfer characteristics; Mineral base oil; Natural oil; Quenchants; Quenching media; Quenching Oil; Safety requirements; Sludge formation; Synthetic oil; Work pieces; Barium; Chemical properties; Cooling; Hardening; Heat resistance; Mineral oils; Phase diagrams; Silicate minerals; Quenching
Subjects:	TECHNICAL SCIENCE
Divisions:	1000 Department of Materials > 1020 Chair of Heat Treatment and Surface Engineering
Indexed in Web of Science:	No
Indexed in Current Contents:	No
Citations SCOPUS:	0 (21.4.2015.)
Date Deposited:	21 Apr 2015 09:37
Last Modified:	21 Apr 2015 11:43
URI:	http://repozitorij.fsb.hr/id/eprint/3835

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