FRACTOGRAPHIC ANALYSIS OF HIGH-FREQUENCY FATIGUE FRACTURES

UDC 621.785.531

Pishchov Mikhail Nikolayevish – PhD (Engineering), Assistant Professor, the Department of Material Science and Engineering of Technical Systems. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: Pishchou@belstu.by

Belsky Sergey Efgrafovich – PhD (Engineering), Professor, the Department of Material Science and Engineering of Technical Systems. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: dmiptu@belstu.by

Tsaruk Fedor Fedorovich – PhD (Engineering), Assistant Professor, the Department of Material Science and Engineering of Technical Systems. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: Tsaruk@belstu.by

DOI: https://doi.org/ 10.52065/2519-402Х-2023-270-2-28 (In Russian).

Key words: aluminum alloys, fatigue characteristics, fatigue tests, laser processing, fatigue cracks, fracture, structure.

For citation Pishchov M. N., Belsky S. E., Tsaruk F. F. Fractographic analysis of highfrequency fatigue fractures. Processing of BSTU, issue 1, Forestry. Nature Management. Processing of Renewable Resources, 2023, no. 2 (270), pp. 238–244. DOI: 10.52065/2519-402Х-2023-270-2-28 (In Russian).

Abstract

The article explores the possibility of using high-frequency cyclic loading for fatigue testing of aluminum alloy AK8M3 obtained using recycled materials. Schemes of stands for testing and a method for determining the fatigue characteristics of metallic materials are given. The coincidence of the distribution of fatigue cracks with the maximum value of cyclic stresses is established. It is shown that the use of highfrequency loading makes it possible to carry out comparative tests of structural materials with a significant acceleration of the research process and with increased reliability of the results due to a larger number of tested objects at an acceptable level of labor costs and energy savings. The optimal value of the percentage of iron in the AK8M3 alloy under study was experimentally established in terms of the level of its fatigue properties, which can be taken within one percent, with an allowable deviation of not more than half a percent of Fe. It can be assumed that this effect of the iron impurity will remain for various types of surface treatment of this alloy. The fractographic analysis of the fractures of the samples consisted in determining and subsequently establishing the main causes of the destruction of the material. Thus, it has been established that the parameters of the laser hardening technology used in this work cannot be recommended for increasing the level of fatigue characteristics of the studied alloy.

Download

References

  1. Efimenko G. G., Mikheeva I. G., Pavlyshin T. N. Steel and alternative materials. Problems of economy and ecology. Metall i lit’ye Ukrainy [Metal and casting of Ukraine], 1997, no. 8–9, pp. 3–8 (In Russian).
  2. Blokhin A. V., Tsaruk F. F., Gaiduk N. A. Complex of equipment for fatigue testing of elements of technological equipment. Trudy BGTU [Proceedings of BSTU], series II, Forestry and Woodworking Industry, 2002, issue X, pp. 213–215 (In Russian).
  3. Matokhnyuk L. E. Uskorennyye ustalosthyye ispytaniya vysokochastotnym nagruzheniyem [Accelerated fatigue testing by high-frequency loading]. Kyiv, Naukova dumka Publ., 1988. 199 p. (In Russian).
  4. Dovgyallo I. G., Tsaruk F. F., Novitsky A. V. Complex for fatigue testing of metallic materials at elevated temperatures. Sovremennyye napravleniya razvitiya proizvodstvennykh tekhnologiy i robototekhniki: materialy mezhdunarodnoy nauchno-tekhnicheskoy konferentsii [Modern directions of development of production technologies and robotics: proceedings of the International. scientific and technical conference]. Mogilev, 1999, p. 326 (In Russian).
  5. Tsaruck F., Novitskiy A. Method of the accelerated prediction of fatigue properties of metals at normal and heightened temperatures by results of high-frequency tests. ISTF 2000: Proceedings of III international symposium on tribo-fatigue. Hunan, China, pp. 193–195.
  6. Kuzmenko V. A. Ustalostnyye ispytaniya na vysokikh chastotakh nagruzheniya [Fatigue tests at high loading frequencies]. Kyiv, Naukova dumka Publ., 1979. 336 p. (In Russian).
  7. Dovgyallo I., Tsaruck F., Dolbin N., Dovgyallo A. Estimation of influence of flecuency of flexural vibrations of structural sensitive characteristics of 20x13 steel. Creep and Coupled Processes: the 4th International Symposium. Bialostok, 1992, pp. 57–63.
  8. Belsky S. E. Equipment complex for ensuring the research of the characteristics of multi-cycle fatigue using high loading frequencies. Proceeding of BSTU, series 1, Forestry. Nature Management. Processing of Renewable Resources, 2019, no. 2 (216), pp. 201–206.
  9. Belsky S. E., Tsaruk F. F., Pishchov M. N., Adel Rashid. Analysis of the kinetics of physical and mechanical characteristics during fatigue testing of tool steel. Technologiya organicheskikh veshchestv: materialy 87-y nauchno-tekhnicheskoy konferentsii professorsko-prepodavatel’skogo sostava, nauchnykh sortudnikov i aspirantov (s mezhdunarodnym uchastiyem) [Technology of organic substances: materials of the 87th scientific and technical conference of faculty, researchers and graduate students (with international participation)]. Minsk, 2022, pp. 292–295 (In Russian).
  10. Tsaruk F. F., Belsky S. E. Effect of iron content and laser treatment on the high-frequency fatigue properties of the AK8M3 alloy. Trudy BGTU [Proceedings of BSTU], series II, Forestry and Woodworking Industry, 2010, issue XVII, pp. 323–326 (In Russian).
  11. Volokitin A., Volokitina I., Panin E., Naizabekov A., Lezhnev S. Strain state and microstructure evolution of AISI-316 austenitic stainless steel during high-pressure torsion (HPT) process in the new stamp design. Metalurgiya, 2021, no. 60 (3-4), pp. 325–328.

10.03.2023