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Acoustic emission characterisation of specimen surface-area-to-volume ratio during immersion quenching
Mojškerc, Bor ; Grum, Janez, 1946- ; Kek, Tomaž, 1974-
Quenching is a heat treatment process that is often used to improve the mechanical properties of materials. This paper deals with the immersion quenching of steel, during which the occurrence of ...different heat transfer stages coincides with the appearance of acoustic emission (AE). A multi-channel AE recording set-up with resonant piezoelectric sensors is utilised. Several rectangular solid steel specimens with different surface-area-to-volume (sa/vol) ratios are heated in an inert gas atmosphere and quenched in tap water or in 10% aqueous-polymer solution. The AE waveforms are recorded and examined. The influence of the specimen sa/vol ratio on AE characteristics is described. Hardness measurements are performed on all quenched specimens. The results show a nearly linear correlation of decreasing AE duration time with increasing sa/vol ratio and partially with increasing hardness. The research results confirm the possibility of using AE non-destructive testing (NDT) to characterise the quenching behaviour of specimens with different sa/vol ratios.
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