ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 3 December 2009
Page Count: 17

Prediction of Quench-Hardness within the Whole Volume of Axially Symmetric Workpieces of Any Shape

Liščić, Božidar
Faculty of Mechanical Engineering, Univ. of Zagreb, Zagreb,

Singer, Saša
Dept. of Mathematics, Univ. of Zagreb, Zagreb,

Smoljan, Božo
Faculty of Engineering, Univ. of Rijeka, Rijeka,

(Received 8 July 2009; accepted 27 October 2009)

Abstract

A quench probe, based on the Temperature Gradient method was used to measure and record cooling curves when quenching real axially symmetric workpieces of any complex shape in liquid quenchants. Calculation of relevant heat transfer coefficients is based on the cooling curve measured just below surface of the cylindrical probe of 50-mm diameter. A two-dimensional computer program, based on the cooling time from 800°C to 500°C (t_8/5), and the Jominy hardenability curve of the steel grade in question, is used to predict the hardness distribution within the whole volume of the workpiece, all at once, which is a unique feature of this method.

Keywords:
quenching, heat transfer coefficient, hardness prediction

Paper ID: JAI102647
DOI: 10.1520/JAI102647
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