OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 24 No. 4 2022 The study of characteristics of the structure of metallic alloys using synchrotron radiation computed laminography (Research Review) Oleg Kutkin 1, a, *, Ivan Bataev 1, b, Gleb Dovzhenko 2, c, Zinaida Bataeva3, d 1 Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation 2 Siberian Circular Photon Source “SKlF” Boreskov Institute of Catalysis of Siberian Branch of the Russian Academy of Sciences (SRF “SKIF”), 1 Nikol’skii pr., Kol’tsovo, 630559, Russian Federation 3 Siberian State University of water transport, 33 Schetinkina str., Novosibirsk, 630099, Russian Federation a https://orcid.org/0000-0003-1277-388X, kutkino@list.ru, b https://orcid.org/0000-0003-2871-0269, i.bataev@corp.nstu.ru, c https://orcid.org/0000-0003-0615-0643, g.dovjenko@skif.ru d https://orcid.org/0000-0001-5027-6193, bataevazb@ngs.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2022 vol. 24 no. 4 pp. 219–242 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2022-24.4-219-242 ART I CLE I NFO Article history: Received: 04 October 2022 Revised: 02 November 2022 Accepted: 03 November 2022 Available online: 15 December 2022 Keywords: Computed tomography Computed laminography X-ray visualization methods Synchrotron radiation Funding This research was funded by the Federal Task of Ministry of Education and Science of the Russian Federation (project FSUN-2020-0014 (20190931): “Investigations of Metastable Structures Formed on Material Surfaces and Interfaces under Extreme External Impacts”. ABSTRACT The paper contains a review of research related to the use of synchrotron radiation computed laminography in the study of the structure features of metal alloys subjected to various methods of external action. Introduction. The important role of X-rays in the field of materials research is discussed. The capabilities of standard X-ray devices equipped with X-ray tubes and modern synchrotron radiation (SR) sources with unique parameters are compared. Methods for studying flat samples. Tomography and synchrotron laminography. An informative method based on the use of synchrotron X-rays is synchrotron radiation computed tomography (SRCT), which allows obtaining cross-section images of objects by processing multiple absorption radiographs. A brief classification of five generations of tomographs is presented. The problems encountered in obtaining data from non-compact (non-isometric) samples are avoided by using the method of synchrotron radiation computed laminography (SRCL), which combines the principles of laminography with the advantages of synchrotron imaging. Currently the method is used for non-destructive testing of non-isometric objects by a number of synchrotron radiation sources (ESRF, ANKA, Spring-8). Resolution of synchrotron radiation computed laminography. The use of monochromatic radiation in realization of computed laminography method is a factor, which provides high spatial resolution down to micron and submicron scale. An equally important factor is related to the characteristics of the detector. Images with a resolution of ~100 nm were obtained using nanolaminography. Comparison of laminography and tomography methods. Augmented laminography. Augmented laminography allows improving image quality by augmenting the Fourier space analyzed by laminography with information obtained from lower resolution CT. Reconstruction performed using Augmented laminography is characterized by the absence of significant artifacts and high resolution. Implementation of the laminography method. The angle of inclination of the rotary axis θ (SRCL method) is related to the geometry of samples and is determined experimentally in each case. In order to achieve the necessary resolution, the value θ should provide an optimal average value of the intensity of the passed radiation. The energy of X-rays is calculated on the basis of material characteristics. To reconstruct images of the objects, software complexes that implement the filtered back projection method based on the Radon transform are used. Examples of laminography application for analysis of metal alloys samples. The laminography method can be used for in-situ investigations allowing real time monitoring of processes occurring under different conditions of external action, e.g. during plastic deformation of metal plates. Data on formation of pore-type defects in the process of loading of metal workpieces are interesting. Numerous examples of post-mortem studies of metal alloys for various purposes are described in the literature. Important information is obtained in the study of fatigue cracks, as well as defects arising in the process of contact-fatigue loading of materials. Conclusion. The SRCT and SRCL methods are rationally implemented at the generation 4+ synchrotron radiation source “SKIF” under construction in Novosibirsk. For citation: Kutkin O.M., Bataev I.A., Dovzhenko G.D., Bataeva Z.B. The study of characteristics of the structure of metallic alloys using synchrotron radiation computed laminography (Research Review). Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2022, vol. 24, no. 4, pp. 219–242. DOI: 10.17212/1994-6309-2022-24.4-219-242. (In Russian). ______ * Corresponding author Kutkin Oleg M., Student, Laboratory assistant Novosibirsk State Technical University, 20 Prospekt K. Marksa, 630073, Novosibirsk, Russian Federation Tel.: 8 (962) 811-59-27, e-mail: kutkino@list.ru
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