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A system was developed which consists of an axial pump to stir the austempering liquid, and an L-C oscillator of a very low and checked amplitude level whose frequency depends on the coil test sample system. The test was performed at a temperature between 180 and 500 °C. Along the time, the austenite transformation of the sample changes the coil inductance, and so the system oscillation frequency. The frequency is measured by a four digits counter that has a time base precision supplied by a piezoelectric quartz crystal. So, the transformation is monitored as it is going on. An interface was constructed in order to make possible data to be downloaded to a computer in order to have an automatic measurement. To contrast the method a SAE 4140 steel was tested and good results were achieved.

Monitoreo de la transformación bainítica por medio de permeabilidad magnética