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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Adamczyk M. Niżnik-Harańczyk B. Pogorzałek J. 2016. Wpływ technologii wytapiania stali z dodatkiem stopowym 3÷5% al na rodzaj i morfo-logię wtrąceń niemetalicznych. Prace Instytutu Metalurgii Żelaza 2(68) 24-32 (In Polish).
Beretta S. Murakami Y. 2001. Largest-Extreme-Value Distribution Analysis of Multiple Inclusion Types in Determining Steel Cleanliness. Met. And Mat. Trans. B 32B 517-523.
Cummings H.N. Stulen F.B. SchulteW.C. 1957. Relation of inclusions to the fatigue properties of SAE 4340 steel. Trans ASM 49 482-516.
Drozin A.D. 2016. Calculating of the True Sizes and the Numbers of Spherical Inclusions in Metal. Metallography Microstructure and Analysis 6(3) 240-246.
Gerasinm S Kaliszm D. 2015. Modeling of the Mn and S Microsegregation During Continuous Casting of Rail Steel. Archives of Foundry Engineeringm 15(4) 35-38.
Lenkovskiym T.M. Kulyk V.V. Duriaginam Z.A. Kovalchukm R.A. Topil-nytskyym V.H. Vira V.V. Tepla T.L. 2017 Mode I and mode II fatigue crack growth resistance characteristics of high tempered 65G steel. Archives of Materials Science and Engineering 84(1) 34-41.
Lipiński T. 2015. The influence of the distribution of nonmetallic inclusion on the fatigue strength coefficient of high purity steels. Journal of Achievements of Materials and Manufacturing Engineering 69(1) 18-25.
Lipiński T. Wach A. 2012. The Effect of the Production Process and Heat Processing Parameters on the Fatigue Strength of High-Grade Medium-Carbon Steel. 2) 55-60. Archives of Foundry Engineering 12(
Lipiński T. Wach A. 2015. Dimensional structure of non-metallic inclusions in high-grade medium carbon steel melted in an electric furnace and subjected to desulfurization. Solid State Phenomena 223 46-53.
Lis T. 2002. Modification of non-metallic dispersion phase in steel. Met. and Foundry Eng. 1(28) 29-45.
Mazur M. Mikova K. 2016. Impact Resistance of High Strength Steels. Procidings Materialstoday 3(4) 1060-1063. https://doi.org/10.1016/j.matpr.2016.03.048
Murakami Y. 2002. Metal fatigue: Effects of small defects and inclusions. Amsterdam Elsevier.
Selejdak J. Ulewicz R. Ingaldi M. 2014. The evaluation of the use of a device for producing metal elements applied in civil engineering. 23rd International Conference on Metallurgy and Materials METAL 1882-1888.
Ulewicz R. 2016. Influence of selected technological factors on fatigue strength. Czasopismo Techniczne Mechanika 3-M 10 9-14.
Ulewicz R. Szataniak P 2016. Fatigue Cracks of Strenx Steel. Science Direct Materials Today: Proceedings 3 1195-1198.
Zhang J.M. Zhanga J.F. Yang Z.G. Li G.Y. Yao G. Li S.X. Hui W.J. Weng Y.Q. 2005. Estimation of maximum inclusion size and fatigue strength in high-strength ADF1 steel. Materials Science and Engineering A 394.