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  • Sound emitted at boundary layer during steel quenching
    Ravnik, Franc ; Grum, Janez, 1946-
    Quenching and tempering often represents the final stage in the manufacturing process of machine parts. The choice of optimum parameters of a quenching process and monitoring of the process itself ... ensures the achievement of the specified hardness and residual stress in the surface layer of the machine component. A hardening process can be controlled by selecting different quenching parameters (quenching media, its temperature, specimen temperature, .). In order to control the hardening process, one should be able to monitor the quenching process in real time. This paper treats an experimental setup comprising detection of sound emission and some of the results obtained during the quenching process. Due to the heat transfer from the specimen to the quenching medium, film boiling and nucleate boiling occur around the heated object, which strongly affects quenching. Bubble formation, their development and implosions, and disappearing around the surface causes sound emission whose intensity depends on the intensity of the bubbles' oscillation and the speed of their disappearing, i.e. on the quenching process. Sound-pressure signals demonstrated by different amplitudes depending on time, at different frequencies, are shown in 3D diagrams. It was established that an analysis of sound emission signals can provide useful information that confirms the differences occurring in quenching with different quenching media and under different quenching conditions. Analyses of sound emission demonstrated that sound emission during quenching process can be used for monitoring the hardening process. Analysis of the quenching results and sound emission signals during the process itself confirm the applicability of the new approach to the controlling of steel quenching.
    Vir: Strojniški vestnik = Journal of mechanical engineering. - ISSN 0039-2480 (Vol. 55, no. 3, mar. 2009, str. 199-209)
    Vrsta gradiva - članek, sestavni del
    Leto - 2009
    Jezik - angleški
    COBISS.SI-ID - 11021083

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