OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 24 No. 1 2022 Comparative study of cavitation erosion resistance of austenitic steels with different levels of metastability Yury Korobov 1, a, *, Hussam Alwan 2, b, Aleksey Makarov 1, c, Vladimir Kukareko 3, d, Vitaliy Sirosh 1, е, Michael Filippov 2, f, Svetlana Estemirova 4, g 1 M.N. Miheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, 18 S. Kovalevskoy str., Ekaterinburg, 620108, Russian Federation 2 Ural Federal University named after the fi rst President of Russia B.N. Yeltsin, 19 Mira str., Ekaterinburg, 620002, Russian Federation 3 The Joint Institute of Mechanical Engineering of the National Academy of Sciences of Belarus, 12 Akademicheskaya str., Minsk, 220072, Republic of Belarus 4 Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences, 101 Amundsen str., Ekaterinburg, 620016, Russian Federation a https://orcid.org/0000-0003-0553-918X, yukorobov@gmail.com, b https://orcid.org/0000-0002-2955-204X, lefta.hussam@gmail.com, c https://orcid.org/0000-0002-2228-0643, av-mak@yandex.ru, d https://orcid.org/0000-0003-4283-871X, v_kukareko@mail.ru, e https://orcid.org/0000-0002-8180-9543, sirosh.imp@yandex.ru, f https://orcid.org/0000-0002-0733-4607, fi lma1936@mail.ru, g https://orcid.org/0000-0001-7039-1420, esveta100@mail.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2022 vol. 24 no. 1 pp. 61–72 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2022-24.1-61-72 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ART I CLE I NFO Article history: Received: 17 December 2021 Revised: 17 January 2022 Accepted: 28 January 2022 Available online: 15 March 2022 Keywords: Cavitation erosion resistance Metastable austenite Martensitic phase transformation Microstructure Deposited coatings Funding The work was carried out within the framework of the state assignment of the IMF UB RAS on topics No. AAAAA18-118020190116-6, No. AAAAA19-119070490049-8. This study was supported by project No. IRASME-66316 “cladHEA +” under the M-ERA.NET program, Call 2019-II. Acknowledgements Research were partially conducted at core facility “Structure, mechanical and physical properties of materials” ABSTRACT Introduction. Reliability-critical components of equipment working in contact with high-speed liquid media (for example, turbine blades of hydroelectric power stations, pump impellers, ship propellers) are subjected to one of the types of wear – cavitation erosion. The current study aims to select and scientifi cally substantiate the type of coating and its structural-phase state for the effective protection of parts from cavitation erosion. Research methods. The study carries out a comparative analysis of differences in the cavitation erosion resistance of characteristic austenitic steels, in the form of bulk material (316L) and coatings (E308L, 60Cr8TiAl), used for protection against cavitation Arc surfacing, i.e. MMA and MIG, is used for depositing the coatings. The tests are carried out on an original installation for evaluating the cavitation resistance of materials with applying ultrasound and the electrical potential difference. Results and Discussion. The results show that the 60Cr8TiAl has a higher resistance to cavitation erosion than that of E308L and 316L by 4 and 10 times, respectively. The structural factors that determine the resistance to cavitation erosion damage are identifi ed to analyze the reasons for the differences in material resistance. Firstly, a strong dependence of the cavitation erosion resistance of austenitic steels on the intensity of the deformation martensitic transformation, developing under the infl uence of cavitation, is confi rmed. This structural transformation contributes to an increase in cavitation resistance of the surface layer. In metastable austenitic steel, a deformation martensite (α′) is formed in the surface layer during the initial test period. This causes an increase in hardness, dissipation of the energy of external action, and the appearance of compressive stresses that prevent the occurrence of microcracks. Subsequently, additional hardening of the previously formed dispersed crystals of α′-martensite occurs. In 60Cr8TiAl, these effects are signifi cantly stronger than that of E308L and 316L due to the higher level of metastability of austenite and formation of carbon deformation martensite. For citation: Korobov Yu.S., Alwan H.L., Makarov A.V., Kukareko V.A., Sirosh V.A., Filippov M.A., Estemirova S.Kh. Comparative study of cavitation erosion resistance of austenitic steels with different levels of metastability. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2022, vol. 24, no. 1, pp. 61–72. DOI: 10.17212/1994-6309-2022-24.1-61-72. (In Russian). ______ * Corresponding author Korobov Yury S., D.Sc. (Engineering), Head of Laser/Plasma Processing Laboratory M.N. Miheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences 18 S. Kovalevskoy str., 620108, Ekaterinburg, Russian Federation Tel.: 8 (919) 379-20-16, e-mail: yukorobov@gmail.com
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