Hardening of Low and Optimal Hardenability Steels and their Physical Processes Explanation

International Journal of Applied Physics

© 2020 by SSRG - IJAP Journal

Volume 7 Issue 2

Year of Publication : 2020

Authors : Nikolai I. Kobasko

10.14445/23500301/IJAP-V7I2P104

How to Cite?

Nikolai I. Kobasko, "Hardening of Low and Optimal Hardenability Steels and their Physical Processes Explanation," SSRG International Journal of Applied Physics, vol. 7,  no. 2, pp. 20-31, 2020. Crossref, https://doi.org/10.14445/23500301/IJAP-V7I2P104

Abstract:

The main idea of this paper is the possibility of cardinal improving quenching technologies, reduce their cost, increase service life of machine components and tools and make technology green based on accurate investigations of the behavior a liquid coolant during hardening in it heated to high temperature metal. It is shown in the paper that recently discovered new features of transient nucleate boiling process allow designing new technologies for optimal hardenability steels comprising mentioned above characteristics. It is underlined in the paper that many already existing
grades of steels can serve as low hardenability (LH) steel for large steel parts to provide similar stress distribution after quenching (high surface compression residual stresses and low tensile stresses at the core). Moreover, it is proposed by author a new criterion for designing quenching processes for low hardenability and optimal hardenability steels that always provide surface compression residual stresses. Along with mentioned above, the paper continues discussion the possibility of performing intensive quenching (IQ) processes in slow agitated water and water solutions.
This fact cardinally reduces the cost of technological process and makes it as a mass production technology to be used worldwidly. It is shown in the paper that without investigation of physics of quench process, it is impossible to design appropriate software for governing and controlling of quenching processes. All provided information can be useful for investigators, scientists and engineers.

Keywords:

Physics of quench process; LH and OH steels; Hardenability criterion; Mass production; Power density; Low cost.

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