During ultrasonic nondestructive testing of several stamped forgings made of nickel heat-resistant alloys of two grades, we discovered a new phenomenon of a local decrease in the amplitude of the bottom echo signal. The decrease was accompanied by the presence of large (more than 20 mm) zones with considerable (up to 1.5%) fluctuations in the propagation velocity of a longitudinal ultrasonic wave that were chaotically scattered over the surface of the semi-finished product. In this case, the material revealed no uneven grain-size distribution or coarse-grained structure, usually causing an increase in the coefficient of attenuation of ultrasonic waves in such alloys and causing a decrease in the amplitude of the bottom echo signal. The present paper describes the studies carried out to establish the physical reasons for the discovered macroscopic inhomogeneity of velocity and its relationship with the drop in the amplitude of the bottom signal.
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Ospennikova, O.G., Trends in the creation of high-temperature low-density nickel alloys with a polycrystalline and single-crystal structure (a review), Aviats. Mater. Tekhnol., 2016, no. 1. pp. 3–19. https://doi.org/10.18577/2071‑9140‑2016‑0‑1‑3‑19
Kablov, E.N., Innovative developments of VIAM SSC RF on the implementation of the “Strategic directions of development of materials and technologies for their processing for the period up to 2030,” Aviats. Mater. Technol., 2015, no. 1(34), pp. 3—33. https://doi.org/10.18577/2071-9140-2015-0-1-3-33
Kablov, E.N., Sidorov, V.V., Kablov, D.E., and Min, P.G., Metallurgical foundations for ensuring high quality of monocrystalline heat-resistant nickel alloys, Aviats. Mater. Tekhnol., 2017, no. S, pp. 55–71. https://doi.org/10.18577/2071‑9140‑2017‑0‑S‑55‑71
Nerazrushayushchii kontrol’/Spravochnik v 7 t. (Nondestructive Testing/A Handbook in 7 Vols.), Klyuev, V.V., Ed., Vol. 3: Yermolov, I.N. and Lange, Yu.V., Ul’trazvukovoi kontrol’ (Ultrasonic Testing), Moscow: Mashinostroenie, 2004.
AMS STD 2154 “Process for Wrought Metals Ultrasonic Inspection.” http://allaboutmetallurgy.com/wp/ wp‑content/uploads/2016/03/AMS‑2154.pdf.
Thompson, R.B. et al., Scattering of elastic waves in simple and complex polycrystals, Wave Motion, 2008, vol. 45, pp. 655–674. https://doi.org/10.1016/j.wavemoti.2007.09.008
Kablov, E.N., The key problem is materials, in Tendentsii i orientiry innovatsionnogo razvitiya Rossii (Trends and Guidelines for Innovative Development in Russia), Moscow: VIAM, 2015, pp. 458–464.
Kablov, E.N., Bondarenko, Yu.A., and Echin, A.B., Development of technology for directional crystallization of casting high-heat-resistant alloys with variable controlled temperature gradient, Aviats. Mater. Tekhnol., 2017, no. S, pp. 24–38. https://doi.org/10.18577/2071‑9140‑2017‑0‑S‑24‑38
Stanke Fred, E. and Kino, G.S., A unified theory for elastic wave propagation in polycrystalline materials, J. Acoust. Soc. Am., 1984, vol. 75, no. 3, pp. 665–681. https://doi.org/10.1121/1.390577
Chen Yeong-Jern, Relationship between ultrasonic characteristics and relative porosity in Al and Al‑XSi alloys, Mater. Trans., 2009, vol. 50, no. 9, pp. 2308–2313. https://www.jim.or.jp/journal/e/pdf3/50/09/2308.pdf.
Landau, L.D. and Lifshits, E.M., Teoriya uprugosti (Theory of Elasticity), Moscow: Fizmatlit, 2007, 5th ed.
Shchipakov, N.A., Development of methods and equipment for acoustic tensometry of pipelines, Extended Abstract of Cand. Sci. (Eng.) Dissertation, Bauman Moscow State Tech. Univ., Moscow, 2012. http://search.rsl.ru/ ru/record/01005047096.
Voronkova, L.V. and Andreev, V.V., Ultrasonic testing of the structure and mechanical properties of iron castings, Liteinoe Proizvod., no. 3, 2016, pp. 9–12. URL: https://elibrary.ru/item.asp?id=25779163.
Pranaam Haldipur, Material characterization of nickel-based super alloys through ultrasonic inspection, PhD Dissertation, Iowa State Univ, Ames, Iowa, 2006. http://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=2258&context=rtd.
Shcherbinskii, V.G., Tekhnologiya ul’trazvukovogo kontrolya svarnykh soyedinenii (Technology of Ultrasonic Testing of Welded Joints), Moscow: Tisso, 2003.
This work was carried out within the framework of the implementation of the complex scientific task no. 2.3. “Methods of nondestructive research and control” (“Strategic directions of development of materials and technologies for their processing for the period up to 2030”) .
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Dalin, M.A., Chertishchev, V.Y., Krasnov, I.S. et al. Investigating Cases of “Abnormal” Attenuation of Ultrasonic Oscillations in Blanks of Nickel Heat-Resistant Alloys. Russ J Nondestruct Test 56, 984–994 (2020). https://doi.org/10.1134/S1061830920120037
- ultrasonic testing
- high-temperature nickel alloy