Fundamental Characteristics of Transient Nucleate Boiling Process used for Cooling Recipes Development

International Journal of Applied Physics

© 2022 by SSRG - IJAP Journal

Volume 9 Issue 2

Year of Publication : 2022

Authors : Nikolai I. Kobasko

10.14445/23500301/IJAP-V9I2P104

How to Cite?

Nikolai I. Kobasko, "Fundamental Characteristics of Transient Nucleate Boiling Process used for Cooling Recipes Development," SSRG International Journal of Applied Physics, vol. 9,  no. 2, pp. 17-21, 2022. Crossref, https://doi.org/10.14445/23500301/IJAP-V9I2P104

Abstract:

This paper discusses the fundamental characteristics of the transient nucleate boiling process. It is shown that discovered characteristics were used for new technologies development, evaluation of materials' thermal properties, and control of the quality of hardened steel parts. The current paper proposes a new simplified method of recipe development based on discovered characteristics combined with numerical calculations. There are several computer codes for temperature 3-D fields calculations; however, up-to-date boundary conditions for the cooling process during hardening steel parts in liquid media are unknown or used incorrectly. In any steel's paper core cooling time, part is considered a duration consisting of transient nucleate boiling and convection. It is assumed that film boiling is completely absent. The main result of the current investigation is the possibility of correctly evaluating the core temperature of the steel part at the end of the nucleate boiling process to switch from boiling to convection. The proposed simplified cooling time calculation method is used to achieve maximal surface compression residual stresses and fine bainitic microstructure at the core of steel parts and evaluate the duration of severe agitation. Engineers in the heat tre4ating industry can use the obtained results.

Keywords:

Cooling time, Fundamental characteristic, Recipe, Simplified method.

References:

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