Application of eddy current method of control for indication of fatigue changes in austenitic steels with martensite formation

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The results of cyclic tests of 08X18N10T structural steel are presented. The tests were carried out using the accelerated Location method. The experimental data obtained showed that cyclic deformation of austenitic steel leads to the formation of deformation martensite, as indicated by the results of X-ray phase examination of the sample. The study of the microstructure of steel also indicates structural and phase transformations occurring in steel. The eddy current signal was measured on the test sample before and after the tests. Changes in the phase and amplitude of the eddy current signal occurring after the tests indicate the possibility of using this method to determine the formation of deformation martensite in austenitic steel.

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Sobre autores

K. Kuskov

Industrial University of Tyumen

Autor responsável pela correspondência
Email: kuskovkv@tyuiu.ru
Rússia, 625000, Tyumen, Volodarsky Street, 38

R. Sokolov

Industrial University of Tyumen

Email: falcon.rs@mail.ru
Rússia, 625000, Tyumen, Volodarsky Street, 38

K. Muratov

Industrial University of Tyumen

Email: muratovkr@tyuiu.ru
Rússia, 625000, Tyumen, Volodarsky Street, 38

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2. Fig. 1. Eddy current flaw detector Vector (1) with a PVR-1 clamp-on transducer (2) and a holder for fixing the position of the sensor on the sample (3).

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3. Fig. 2. Microstructure of 08Kh18N10T steel at 200x magnification: as delivered (a); after austenitization (b).

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4. Fig. 3. Images of the test sample with the areas where measurements were taken indicated.

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5. Fig. 4. Change in eddy current signal before and after cyclic testing: change in the real component of the introduced voltage (a); change in the imaginary component of the introduced voltage (b); change in the amplitude of the introduced voltage (c); change in the phase of the introduced voltage (d).

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6. Fig. 5. Microstructure of the sample after fatigue testing in the fracture region (×200).

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7. Fig. 6. Diffractograms of 08Kh18N10T steel: full diffractogram (a); enlarged diffractogram near the angle of 44° (b); enlarged diffractogram near the angle of 51° (c); enlarged diffractogram near the angle of 75° (d).

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