Abstract
Abstract This paper presents an ultrasonic method to measure the movement of workpiece surfaces during quenching processes in liquids in order to estimate the time-dependent in-process distortion of the workpiece. The movement is determined by the time-of-flight of the ultrasonic signals from the transducer to the surface and back again (impuls-echo-method). As the simulation of quenching processes depends on several assumptions of the model parameters and almost no experimental intermediate geometry data for quenching processes exist, the in-process-measurements of the surface movement can be used to improve the simulation models and also to extend the knowledge about model parameters. The paper shows an analysis of the ultrasonic data for measurements on cylindrical discs of 20MnCr5 steel and compares the ultrasonic in-process results with simulated data. Additionally, coordinate measurements carried out before and after the heat treatment are presented as a reference and the uncertainty of the ultrasonic measurements is discussed.
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