10.14489/td.2024.08.pp.004-016

2024, 08 August

DOI: 10.14489/td.2024.08.pp.004-016

Danilov V. N., Ushakov V. M.
ESTIMATION OF THE AVERAGE GRAIN SIZES IN METAL AND THEIR DISPERSION BY CHANGING THE AMPLITUDES OF BOTTOM ECHOES OF LONGITUDINAL WAVES WITH A DIFFERENT NUMBER OF REFLECTIONS
(pp. 4-16)

Abstract. A model (algorithm) has been developed for estimating the average size of a metal grain and the spread of its magnitude (standard deviation) according to experimental values of attenuation coefficients due to scattering of longitudinal waves on grains determined by the ratio of the amplitudes of bottom echoes (of the first and higher order) at three frequencies using a table of values of the difference between experimental and calculated values of attenuation coefficients. Computer modeling of the pulse amplitude differences of the 1st and 3rd bottom echoes for normal probe models with nominal frequencies of 5.0, 7.5 and 10.0 MHz and two variants of grain parameters used to test the specified algorithm has been carried out. The results obtained make it possible to choose the optimal operating frequency for metal control by a normal probe based on the estimated value of attenuation of longitudinal waves, determined by the average size of metal grains and the value of its magnitude spread.

Keywords: average grain size, longitudinal wave, normal probe, attenuation coefficient, scattering on grains, bottom echo, pulse, signal spectrum, contact liquid layer.

+ - About the Authors Click to collapse

V. N. Danilov, V. M. Ushakov (JSC “RPA “CNIITMASH”, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Conformity assessment system in the field of nuclear energy use. Conformity assessment in the form of control. Unified methods. Ultrasonic testing of welded joints and deposited surfaces. (2023). Ru Standard No. GOST R 50.05.02‒2022. Moscow: Standartinform. [in Russian language]
2. Klyuev V. V. (Ed.), Ermolov I. N., Lange Yu. V. (2006). Non-destructive testing: reference book: in 8 volumes. Vol. 3. Ultrasonic testing. 2nd ed. Moscow: Mashinostroenie. [in Russian language]
3. Danilov V. N. (1989). Toward the calculation of the attenuation coefficient of elastic waves during scattering in polycrystalline media. Defektoskopiya, (8), 18 – 23. [in Russian language]
4. Dymkin G. Ya., Kadikova M. B. (2009). Ultrasonic method for quantitative assessment of the metal structure of wheel pair axles. Defektoskopiya, (7), 27 – 36. [in Russian language]
5. Ermolov I. N. (1992). Ultrasound testing: a quick guide. Moscow: NPO TsNIITMASh. [in Russian language]
6. Merkulova V. M. (1970). Influence of grain size distribution on the attenuation of ultrasonic waves. Defektoskopiya, (2), 111 – 113. [in Russian language]
7. Kesler N. A., Shrayfel'd L. I. (1975). Study of ultrasound scattering taking into account the statistics of grain size distribution of polycrystalline metals. Defektoskopiya, (1), 95 ‒ 100. [in Russian language]
8. Merkulov L. G., Merkulova V. M. (1976). Lectures on ultrasound theory. Taganrog: Taganrogskiy radiotekhnicheskiy institut. [in Russian language]
9. Danilov V. N., Ushakov V. M., Rymkevich A. I. (2021). Study of the possibilities of assessing the state of the metal structure of pipelines that were in operation using the ultrasonic method. Defektoskopiya, (8), 3 – 13. [in Russian language]
10. Danilov V. N. (2022). About influence of thickness of a layer of a contact liquid on amplitude echo signal the normal probe with different number of reflections from a bottom surface. Kontrol'. Diagnostika, 25(1), 4 ‒ 15. [in Russian language] DOI: 10.14489/td.2022.01.pp.004-015
11. Danilov V. N., Ushakov V. M., Evtushenko S. G. (2023). On some features of the signal spectra in the ultrasonic study of the metal structure with increased attenuation of longitudinal waves. Kontrol'. Diagnostika, 26(2), 13 ‒ 21. [in Russian language] DOI: 10.14489/td.2023.02.pp.013-021
12. Danilov V. N. (2006). Computer simulation program for the operation of electroacoustic paths of flaw detectors “Impulse +”. Defektoskopiya, (3), 37 ‒ 43. [in Russian language]
13. Danilov V. N., Izofatova N. Yu., Voronkov V. A. (1997). Comparison of theoretical and experimental results of studying the operation of direct combined converters. Defektoskopiya, (6), 39 ‒ 49. [in Russian language]

+ - Purchase digital version of a single article) Click to collapse

This article is available in electronic format (PDF).

The cost of a single article is 500 rubles. (including VAT 20%). After you place an order within a few days, you will receive following documents to your specified e-mail: account on payment and receipt to pay in the bank.

After depositing your payment on our bank account we send you file of the article by e-mail.

To order articles please copy the article doi:

10.14489/td.2024.08.pp.004-016

and fill out the form