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. Trško, L., Nový, F., Bokůvka, O., Jambor, M., 2018. Ultrasonic Fatigue Testing in the Tension-Compression Mode . J. Vis. Exp. (133), e57007, doi:10.3791/57007 (2018). Ulewicz, R., Mazur, M., 2013. Fatigue testing structural steel as a factor of safety of technical facilities maintenance . Prod. Eng. Arch. 1/1, 32–34. Ulewicz, R., Szataniak, P., Novy, F., 2014. Fatigue properties of wear resistant martensitic steel , in: METAL 2014 - 23rd International Conference on Metallurgy and Materials, Conference Proceedings. pp. 784–789.

layer quality after corrosion load,. Production Engineering Archives, Volume 6, No. 1, 45-48. 10. U lewicz R., M azur M. 2015. Fatigue testing structural steel as a factor of safety of technical facilities maintenance, Production Engineering Archives, Volume 1, No. 1, 32-34. 11. V ičan J., K oteš P., Ś piewak A., U lewicz M. 2016. Durability of bridge structural elements , Communication 18(4), 61-67. 12. V ičan J., U lewicz M., C hwastek A. 2015. Assessing the corrosion impact on bearing capacity of steel girder bridges in Poland , Transcom Proceedings

., Wach, A., 2015. Effect of impurities on bending fatigue strength of structural steel , Engineering for Rural Development, 784-789. Lipiński, T., Wach, A., 2015. The Effect of Fine Non-Metallic Inclusions on The Fatigue Strength of Structural Steel , Archives of Metallurgy and Materials, 60(1), 65-69. Majewski, G., Orman, Ł.J., Telejko, M., Radek, N., Pietraszek, J., Dudek A., 2020. Assessment of thermal comfort in the intelligent buildings in view of providing high quality indoor environment , Energies 13(8), 1973. Moiseeva, L.A., Moiseev, B.P., 2007. Composition


The article discusses the results of a study investigating the effect of the number of fine non-metallic inclusions (up to 2 μm in size) on the fatigue strength of structural steel during rotary bending. The study was performed on 7 heats produced in an industrial plant. Fourteen heats were produced in a 100 ton oxygen converter. All heats were subjected to vacuum circulation degassing.

Steel sections with a diameter of 18 mm were hardened and tempered at a temperature of 200, 300, 400, 500 and 600°C. The experimental variants were compared in view of the applied melting technology and heat treatment options. The heat treatments were selected to produce heats with different microstructure of steel, from hard microstructure of tempered martensite, through sorbitol to the ductile microstructure of spheroidite. The results were presented graphically, and the fatigue strength of steel with a varied share of non-metallic inclusions was determined during rotary bending. The results revealed that fatigue strength is determined by the relative volume of fine non-metallic inclusions and tempering temperature.

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, N., Szczotok, A., Gadek-Moszczak, A., el al., 2018. The impact of laser processing parameters on the properties of electro-spark deposited coatings , Archives of metallurgy and materials, 63, 809-816. Tsui, L.-K., Garzon, F., 2017. C arbonXS GUI: A graphical front-end for CarbonXS . J. Appl. Crystallogr. 50, 1830-1833. Vicen, M., Fabian, P., Bronček, J., Radek, N., 2019. Effect of PVD coating on change properties of 100Cr6 bearing steel , Slovak Journal of Technolog, 11, 63-66. Ulewicz, R., Mazur, M., 2013. Fatigue testing structural steel as a factor of safety

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Structural Steel. Journal Of The Balkan Tribological Association (22)2, pp. 1147-1155. Vasantharaja, P., Vasudevan, M. and Maduraimuthu, V. (2018). Effect of Arc Welding Processes on the Weld Attributes of Type 316LN Stainless Steel Weld joint. Transactions of the Indian Institute of Metals, [online] 71(1), pp. 127-137. Available at: [Accessed 29 Jun. 2017]. Zareie Rajani, H.R., Torkamani, H., Sharbati, M. and Raygan, Sh. (2012). Corrosion resistance improvement in Gas Tungsten Arc Welded 316L stainless steel

.06.036. Ulewicz, R. and Mazur, M. (2013) ‘Fatigue Testing Structural Steel as a Factor of Safety of Technical Facilities Maintenance’, Production Engineering Archives , 1/1, pp. 32–34. doi: 10.30657/pea.2013.01.10. VEB SKL (1960) Buckau-Wolf R8VD-136 Engine Passport. No. 28878 . Magdeburg. Wang, T. et al. (2019) ‘Instantaneous Rotational Speed Measurement Using Image Correlation and Periodicity Determination Algorithms’, IEEE Transactions on Instrumentation and Measurement , pp. 1-1. doi: 10.1109/TIM.2019.2932154. Yang, J. et al. (2001) ‘Fault Detection in a Diesel