System for process analysis and hardness prediction when quenching axially-symmetrical workpieces of any shape in liquid quenchants

Liščić, Božidar (2010) System for process analysis and hardness prediction when quenching axially-symmetrical workpieces of any shape in liquid quenchants. = System for process analysis and hardness prediction when quenching axially-symmetrical workpieces of any shape in liquid quenchants. Materials Science Forum, 638-64. pp. 3966-3974. ISSN 0255-5476. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. . .

Text System for Process Analysis and Hardness Prediction When Quenching Axially-Symmetrical Workpieces of Any Shape in Liquid Quenchants.pdf - Published Version Restricted to IP adress Jezik dokumenta:English Download (2MB)

Abstract

A new Temperature Gradient System has been designed for practical use when quenching real workpieces in any kind of liquid quenchants. The main hardware component of the system is a cylindrical probe of 50 mm Dia. x 200 mm assembled with three thermocouples, and the temperature data acquisition unit for automatic drawing of cooling curves. The accompanying software-package consists of three modules: The first one for calculation of the heat transfer coefficient, the second one for quenching process analysis by graphical presentation of different thermodynamic functions, and the third one for hardness distribution prediction on the axial section of axially-symmetrical workpieces of any complex shape. The hardness prediction 2-D program is based on a Finite Volume Method, by which cooling curves in every particular point of the axial workpiece section are calculated, and cooling times from 800 °C to 500 °C (t8/5) determined. Using the known relation between the cooling time (t8/5) and the distance from the quenched end of the Jominy specimen, for the relevant steel, the hardness can be predicted, at once, in every particular point of the axial workpiece section, which is the unique feature of this system. The system itself is designed to: record, evaluate and compare real quenching intensities during the whole quenching process, when different liquid quenchants with different conditions are used, and different quenching techniques have been applied. © (2010) Trans Tech Publications.

Item Type:	Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian):	Axial sections; Complex shapes; Cooling curve; Cooling time; Graphical presentations; Hardness distribution; Hardness prediction; Hardware components; Jominy specimens; Practical use; Prediction of hardness distribution; Process analysis; Quenchants; Quenching process; Temperature data; Temperature gradient; Thermodynamic functions; Unique features; Work pieces; Cooling; Distribution functions; Hardness; Heat exchangers; Heat transfer coefficients; Liquids; Phase diagrams; Thermocouples; Quenching
Subjects:	TECHNICAL SCIENCE > Mechanical Engineering
Divisions:	1000 Department of Materials
Indexed in Web of Science:	No
Indexed in Current Contents:	No
Citations SCOPUS:	3 (1.7.2015.)
Date Deposited:	10 Apr 2015 12:57
Last Modified:	26 Aug 2015 07:11
URI:	http://repozitorij.fsb.hr/id/eprint/3710

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