Assessment of sound emission phenomena at a boundary layer during steel quenching [Elektronski vir]
Ravnik, Franc ; Grum, Janez, 1946-
The final stage in the production of machine components in the manufacturing process often represents quenching and tempering. Mechanical properties, such as residual stresses and hardness layer of ...final part, therefore depend on optimum parameters of a quenching process chosen and monitoring of the process itself. The paper treats an experimental setup comprising detection of sound emission in the course of quenching process. Due to heat transfer from aspecimen's surface to a quenching medium, film boiling and nucleate boiling occur round a heated specimen, which strongly affects quenching. An investigation of sound emission in the quenching process was carried out with cylindrical specimens made of chrome-molybdenum heat-treatable steel 42CrMo4 quenched in different quenching media. Sound-pressure signals demonstrated by different amplitudes depending on time at different frequencies are shown in 3D diagrams. It has turned out that an analysis of sound-emission signals are connected with wettings kinematics and can provide useful information that confirms differences occurring in quenching with different quenching media, different specimen's shapes and under different quenching conditions. Analysis of sound emission signals can give useful information and confirm the differences caused by different quenching conditions. The results lead to the applicability of the new approach to the control of the hardening processes of steels.
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