Acoustic emission in bearing steel during isothermal formation of midrib |
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Authors: | T Z Wozniak K Rozniatowski Z Ranachowski |
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Affiliation: | (1) Materials Design Laboratory, Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, South Korea, 790-784;(2) Advanced Steel Processing and Products Research Centre, Colorado School of Mines, Golden, CO 80401, USA; |
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Abstract: | The first attempt of an acoustic emission (AE) application for the control of isothermal transformation, at the temperature
near the martensite start (M
S
) in 100CrMnSi6-4 bearing steel, is made herein. A unique method for recording the signals of the AE was developed. The Short
Time Fourier Transform algorithm was used for displaying the signal values on the spectrogram graphs. Acoustic emission showed
the nucleation and growth of the isothermal martensite in the residual austenite. The maximum power spectral density of signals
was determined using the relative intensity of the RMS values. The observed energy of separated signals during the second
stage of residual austenite decomposition is comparable to the energy of the initial stage at lower temperatures. It was proposed
as a new process concept under paraequilibrium that involves the midrib formation and swing back in the kinetics of lower
bainite. |
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Keywords: | |
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