Dynamics characterization of microstructural changes in bars of duplex steels SAF 2205 using the information dimension
DOI:
https://doi.org/10.3989/revmetalm.007Keywords:
Deterministic chaos, Dimension of information, Duplex stainless steel SAF 220, Dynamic phase space Ultrasonic testingAbstract
This study evaluates the ultrasonic signals behavior of a duplex stainless steel SAF 2205 (UNS S31803) after aging treatments at 875 and 950 °C. The first treatment promotes the precipitation of the sigma phase and the second, its dissolution. The microstructural evaluation was carried out by optical microscopy. The results showed an increase of the sigma phase fraction and the secondary austenite with the time of aging treatment at 875 °C. On the other hand, increasing the time of treatment at 950 °C promotes a reduction of the sigma phase and the corresponding increase of the ferrite phase fraction. The study proposed to evaluate in the dynamical system field the influence of microstructural phases in the signals behavior and their dependence on the energy losses occurring in system during heat treatment, by deterministic chaos theory. To accomplish characterization, algorithm employs the representation of dynamic phase space and the information dimension estimate. The results show a higher correlation between the information dimension and the attenuation coefficient in comparison with the phase fractions. However, the efficiency of this type of study will depend on the frequency selected for the evaluation of the material.
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