Transformations in the Ti-6Al-4V Alloy Studied Using Dilatometry Supported by Acoustic Emission.

This paper presents the results of research on the kinetics of transformations in the two-phase (α + β) Ti-6Al-4V alloy. The transformation start and end temperatures during heating at different rates were determined using a dilatometer. A modified dilatometer was employed, equipped with an acoustic emission measurement apparatus and software enabling the assessment of sample dimensional changes during heating and cooling.

The Use of Acoustic Emission and Neural Network in the Study of Phase Transformation below M.

Acoustic emission and dilatometry were applied to investigate the characteristics of phase transformations in bearing steel 100CrMnSi6-4 during austempering below the martensite start temperature (M 175 °C) at 150 °C. The aim of this study is to characterize the product of transformation occurring below the M temperature using various research methods. Analysis of the dilatometric curves shows that, after the formation of athermal martensite below the M temperature, the austenite continues to undergo isothermal transformation, indicating the formation of bainite.