Determination of heat transfer coefficient during high-speed water quenching Online publication date: Sun, 24-Jun-2012
by Thomas Lübben; Jochen Rath; Fabian Krause; Franz Hoffmann; Udo Fritsching; Hans-Werner Zoch
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 7, No. 2/3, 2012
Abstract: According to literature, rapid water quenching can create compressive residual stresses near the surface even in through-hardening steel grades and can hereby lead to a significant increase of the fatigue-limit. But, there is a lack in understanding the mechanisms and limitations of high speed quenching. Therefore, a new quenching facility was constructed to characterise such quenching processes. One of the first steps was the determination of heat transfer coefficients (HTC) in such a facility. This parameter is necessary to characterise and to simulate a quenching process. In this paper the experimental determination of HTC, and the results of flow field and HTC calculation by use of CFD will be presented. A comparison of measurements and simulations shows a systematic discrepancy, which must be explained by (a) systematical error(s) in the experimental estimation method of HTC and may be due to the complexity of the applied turbulent mass and heat transfer models.
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