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Influence of Grain Size on the Propagation of L\(_\mathrm{CR}\) Waves in Low Carbon Steel

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Abstract

The acoustoelastic theory states that mechanical stress relates to the wave speed. The microstructure of the materials influences the propagation of any ultrasonic wave, which is a major drawback in employing critically refracted longitudinal waves (L\(_\mathrm{CR}\)) in field measurements. The present study investigates the effect of mean austenitic grain size (MAGS) on propagation speed of L\(_\mathrm{CR}\) waves in ASTM A36 low carbon hot-rolled steel plates subjected to different heat treatment temperatures. The samples were heated at 900, 1000, 1050, 1100, 1200 \(^{\circ }\)C for 30 min to obtain different grain sizes. They were measured as received and after the heat treatment, employing the ultrasonic method. The MAGS were compared to the grain size obtained from optical microscopy. The results confirmed the influence of the MAGS on the L\(_\mathrm{CR}\) speed, which can be represented by a second order polynomial curve. From the experimental results, we show that it is necessary to correct the effect of the MAGS on the L\(_\mathrm{CR}\) speed; otherwise we cannot measure the stresses without previous calibration using a stress reference.

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Acknowledgments

The authors are grateful to the School Mechanical Engineering (FEM) of the University of Campinas (UNICAMP). The authors also thank the National Council for Scientific and Technological Development (CNPq) for the financial support.

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Authors and Affiliations

  1. Departamento de Sistemas Integrados, Faculdade de Engenharia Mecânica, Universidade Estadual de Campinas, Campinas, SP , 13083-860, Brasil

    Alexandre Aparecido Buenos, Paulo Pereira Jr & Auteliano Antunes dos Santos

  2. Departamento de Engenharia de Materiais, Faculdade de Engenharia Mecânica, Universidade Estadual de Campinas, Campinas, SP , 13083-860, Brasil

    Paulo Roberto Mei

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  1. Alexandre Aparecido Buenos
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  2. Paulo Pereira Jr
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  3. Paulo Roberto Mei
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  4. Auteliano Antunes dos Santos
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Correspondence to Auteliano Antunes dos Santos.

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Buenos, A.A., Pereira, P., Mei, P.R. et al. Influence of Grain Size on the Propagation of L\(_\mathrm{CR}\) Waves in Low Carbon Steel. J Nondestruct Eval 33, 562–570 (2014). https://doi.org/10.1007/s10921-014-0252-x

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  • DOI: https://doi.org/10.1007/s10921-014-0252-x

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