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  • 1.
    Dugic, Izudin
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Berndt, Robin
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Josefsson, Simon
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Hedström, Martin
    China Euro Vehicle Technology AB, Sweden.
    Non-metallic inclusion and their effect on fatigue strength for case-hardened carbon steel in gears2018In: TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings. TMS 2018, Springer, 2018, p. 123-133Conference paper (Refereed)
    Abstract [en]

    Steel is a very essential structural material and its production worldwide has shown significant increase over the last years. In steels there always exist a large number of inclusions which can have a degrading effect on the fatigue properties. This study is focused on the link between the characteristics of non-metallic inclusions and how they affect fatigue strength of the standardized case-hardened carbon steel 20MnCr5 and a version of this steel with a more favorable inclusion distribution, a so-called Clean steel. For the evaluation of the mechanical properties the test result from rotary bending tests are compared and an improvement by 37.5% in fatigue strength can be noted between the different steels. The new performed ultrasonic tests illustrate the difference in the size of defects in materials with different manufacturing processes and degree of reduction. By studying international and European standards for non-destructive testing and investigation of alloy compounds, the current material specification can be adjusted. © The Minerals, Metals & Materials Society 2018.

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