Assessment of microstructure- and inclusion-induced fatigue crack initiation in bainitic/martensitic rail steels: Competing and synergistic effects

Fan, Yusong; Gao, Guhui; Gui, Xuchun; Bai, Bingzhe; Yang, Zhinan

doi:10.1016/j.ijfatigue.2023.107706

Cited by 5 publications

(1 citation statement)

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“…Many authors have described impurities in steel over the decades [15][16][17][18][19]. The conducted research constantly provides new data, thanks to which it is possible to rationally control the quality of steel produced to meet the specific, ever-higher requirements of customers.…”

Section: Conflicts Of Interestmentioning

confidence: 99%

Quality of Low-Carbon Steel as a Distribution of Pollution and Fatigue Strength Heated in Oxygen Converter

Lipiński

2023

Coatings

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The works available in the literature presenting the influence of impurities on the properties (mainly fatigue strength) of material give an answer with a high degree of probability for hard steels and large precipitations (usually above 10 µm). The impact of non-metallic impurities on the durability of high-ductility steels causes much greater problems and is much more difficult to explain. The results of the existing studies rarely take into account the diameter of the impurities in relation to the distance between the impurities. This paper presents the results of tests carried out on a low-carbon steel heated in a 100-tonne oxygen converter and deoxidized under vacuum. The fatigue strength test was carried out on cylindrical samples using rotational bending for different tempering temperatures of the steel. The quotient of the average size of the inclusions and the average distance between the inclusions were analyzed. Based on the obtained results, it was found that steel annealed in the converter and vacuum degassed has a content of both phosphorus and sulfur below 0.02% and a total volume of impurities of 0.086%. The main fraction of impurities are oxide inclusions with a diameter below 2 µm. An increase in fatigue strength was found along with an increase in the number of impurities, mainly of small diameters.

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Section: Conflicts Of Interestmentioning

confidence: 99%