Effect of impurities on bending fatigue strength of structural steel
2015
Lipinski, T., University of Warmia and Mazury in Olsztyn (Poland) | Wach, A., University of Warmia and Mazury in Olsztyn (Poland)
Non-metallic inclusions as impurities found in steel can affect its performance characteristics. Their impact depends not only on their quality, but also, among others, on their size and distribution in the steel volume. The literature mainly describes the results of tests on hard steels. The article discusses the results of a study investigating the effect of the number of submicroscopic non-metallic inclusions (up to 2 µm in size) on the fatigue strength of structural steel during rotary bending. The study was performed on 21 heats produced in an industrial plant. Fourteen heats were produced in 140 t electric furnaces, and 7 heats were performed in a 100 ton oxygen converter. All heats were desulfurized. Seven heats from electrical furnaces were refined with argon, and heats from the converter were subjected to vacuum circulation degassing. The experimental variants were compared in view of the applied melting technology and heat treatment options. The fatigue strength of steel with impurity spaces was determined during rotary bending. The results revealed that the fatigue strength is determined by the impurity spaces and tempering temperature.
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