Obrabotka Metallov 2020 Vol. 22 No. 1

OBRABOTKAMETALLOV Vol. 22 No. 1 2020 99 MATERIAL SCIENCE In fl uence of the Material Structure on the Deformed Surface Morphology Ekaterina Alfyorova 1, a , Andrey Filippov 2, b 1 National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk, 634050, Russian Federation 2 Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS, 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation a https://orcid.org/0000-0001-9579-6870, katerina525@mail.ru , b https://orcid.org/0000-0003-0487-8382, andrey.v. fi lippov@yandex.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2020 vol. 22 no. 1 pp. 90–101 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2020-22.1-90-101 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 24 October 2019 Revised: 27 December 2019 Accepted: 20 January 2020 Available online: 15 March 2020 Keywords : Surface morphology Deformation Three-dimensional roughness parameters Single crystals Polycrystals Ultra fi ne-grained metals Microstructure Funding The results were obtained with fi nan- cial support from Fundamental Re- search Program of State Academies of Sciences for 2013-2020 (project No III.23.2.4). The research is supported by Tomsk Polytechnic University within the framework of Tomsk Poly- technic University Competitiveness Enhancement Program. Acknowledgements The authors thank Professor D. Lycha- gin for the samples of single crystals. ABSTRACT Introduction . Morphological changes in the free surface of materials during loading are interesting from a fundamental and practical point of view. In the fi rst case, through the deformation relief, scientists judge the processes taking place inside the material, identify the deformation mechanisms, analyze the change in the stress-strain state, etc. In the second case, the deformation relief is an undesirable phenomenon, because it worsens fatigue resistance, adhesion, leads to cracking and reduces other physical and mechanical properties of machine parts. In addition, on the basis of the deformation relief, scientists try to evaluate the residual life of the machine parts. Today, industry uses materials in various structural conditions. The microstructure of the metal (the presence or absence of grains and grain boundaries, grain size, texture, crystallographic orientation, etc.) has a signi fi cant effect on the nature of the course of plastic deformation and the morphology of the deformed surface. The purpose of the work is to study the in fl uence of the material structure on the evolution of the surface morphology during deformation. For this purpose, nickel samples in a single- crystal, polycrystalline, and ultra fi ne-grained state are investigated. The methods of investigation are mechanical compression tests, confocal laser scanning microscopy. Quanti fi cation is carried out using standardized three-dimensional roughness parameters. Results and Discussion . The paper shows the in fl uence of the internal structure of the material on the evolution of the morphology of the deformation surface. Changes in the strain relief are discussed in terms of the prevailing strain mechanisms for each structural state of the material. It is shown that using three-dimensional roughness parameters, one can evaluate the presence of potential stress concentrators on the surface. It is determined that the presence of deep sharp depressions is most inherent in the material in a polycrystalline state. The results of the work can be useful for a reasoned choice of the microstructure of the material in the manufacture of machine parts and for mathematical modeling of the behavior of metals under load For citation: Alfyorova E.A., Filippov A.V. In fl uence of the Material Structure on the Deformed Surface Morphology. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2020, vol. 22, no. 1, pp. 90–101. DOI: 10.17212/1994- 6309-2020-22.1-90-101. (In Russian). ______ * Corresponding author Alfyorova Ekaterina A. , Ph.D. (Physics and Mathematics), Associate Professor National Research Tomsk Polytechnic University, 30 Lenin Avenue, 634050, Tomsk, Russian Federation Tel.: +7-909-547-1201 , e-mail: katerina525@mail.ru