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Snoek relaxation and dislocation damping in aged Fe-Cu-Ni steel

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Abstract

We studied the Snoek relaxation and ultrasonic shear-wave attenuation in steels containing 1.29 at. pct Cu subjected to various isothermal agings. The steel’s hardness increases with aging time, then, after reaching a maximum, it decreases. The peak hardness was 17 pct higher than in the nonaged material. Aging embrittlement is caused by bcc copper clusters precipitated from the ferrite iron crystal. Using a forced-vibration torsion-pendulum method, we studied the aging effect on the Snoek-relaxation characteristics: the internal-friction spectrum (peak position and strength) and decay of the maximum internal friction after quenching from 723 K. We observed a broad nonsymmetrical peak centered near 0.1 Hz at room temperature that could be decomposed into three Debye peaks. The decay rate showed a correlation with hardness; faster decay occurred in the higher-hardness steel. Also, we observed a monotonical decrease of ultrasonic attenuation after quenching, indicating carbon atoms diffusing to dislocations. We interpreted our Snoek-relaxation results in terms of Nowick’s theory of interstitial/substitutional-solute interactions. Concerning analysis of the decay measurements, we used the Granato-Hikata-Lücke (GHL) theory and the Cottrell-Bilby (CB) t 2/3 model, which well explained the measurements and allowed us to estimate the evolution of dislocation density with aging. The transmission electron microscopy (TEM) observations supported this.

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Authors and Affiliations

  1. the Graduate School of Engineering Science, Osaka University, 560-8531, Osaka, Japan

    Hirotsugu Ogi (Associate Professor)

  2. the Materials Science and Engineering Laboratory, National Institute of Standards and Technology, 80303, Boulder, CO

    Hassel Ledbetter (Leader of the Physical Properties Group) & Sudook Kim (Researcher)

Authors
  1. Hirotsugu Ogi
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  2. Hassel Ledbetter
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  3. Sudook Kim
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Ogi, H., Ledbetter, H. & Kim, S. Snoek relaxation and dislocation damping in aged Fe-Cu-Ni steel. Metall Mater Trans A 32, 1671–1677 (2001). https://doi.org/10.1007/s11661-001-0145-3

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  • DOI: https://doi.org/10.1007/s11661-001-0145-3

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