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Elastic-Wave Characteristics from Crack Initiation and Propagation of High-Strength Steel Immersed in Acetic-Acid Solution

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Abstract:

In this study, elastic waves were detected when different bending stresses were applied to cracked specimens of high-strength steel (SKD11: HV550) immersed in a 0.057 M solution of acetic acid (CH3COOH), and frequency characteristics were analyzed using time-frequency analysis. The dominant frequency obtained using the tensile test was approximately 103 kHz, and those in the acetic-acid solution without stress were approximately 32 and 101 kHz. The dominant frequencies of the crack specimens in which cracks propagated were approximately 30–40 (F1), 60–85 (F2), and 100–110 (F3) kHz. An elastic wave was obtained by corrosion, pitting, crack initiation, and propagation but not during the hydrogen aggregation time. The dominant frequencies of the crack specimens without crack propagation were approximately 28–33 (F1) and 94–109 (F3) kHz. These were the same as the dominant frequency in the acetic-acid solution under nonstress conditions. The fractured surface showed many traces of pitting and corrosion regardless of the applied stress, resulting in microcracks in the Cr carbide. -----------------------------------------------------------------------------------------------------------

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Periodical:

Applied Mechanics and Materials (Volume 913)

Pages:

23-34

DOI:

https://doi.org/10.4028/p-v2cmel

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Online since:

March 2023

Authors:

Kyoung Hee Gu, Jae Eun Paeng, Gum Hwa Lee, Ki Woo Nam*

Keywords:

Acid Solution, Dominant Frequency, Elastic Wave, High Strength Steel

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© 2023 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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