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Behaviour of ODS Steels in Cyclic Loading

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Abstract

The low cycle fatigue behaviour of several high chromium oxide dispersion strengthened (ODS) steels prepared by powder metallurgy was studied in a detailed way. Studied ODS steels were divided into two groups, ultrafine grained (UFG—grain size under 1 μm) and coarse grained (CG—grain size of 200 μm). Microstructure of as received state of individual steels was observed by means of SEM and TEM. Cyclic hardening/softening curves were measured at room temperature and at 650 °C. It is shown that 0.3 wt% of oxide nanoparticles strengthen the materials substantially and reduces the cyclic softening compared to non-ODS steels. Cyclic softening was measured in CG steel and in UFG ODS ferritic/martensitic steel at room temperature, but stable cyclic behaviour was observed at 650 °C. UFG ODS ferritic steels exhibited stable cyclic behaviour at both testing temperatures. Derived Wöhler and Coffin-Manson curves were measured and substantial differences in fatigue life were revealed. Crack initiation mechanisms and fatigue crack growth rate were analysed. The crack initiation mechanism differs for studied steels, as well as fatigue crack growth rate. The relative length of nucleation and propagation stages of the fatigue life is discussed for individual materials. TEM observations revealed differences in microstructure evolution during fatigue loading in particular steels. All results are thoroughly discussed to explain differences in fatigue life of studied steels.

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Acknowledgments

The financial support was provided by the Grant Agency of the Czech Republic Project 15-08826S. This work was realized in CEITEC—Central European Institute of Technology with research infrastructure supported by the Project CZ.1.05/1.1.00/02.0068 financed from European Regional Development Fund.

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Authors and Affiliations

  1. CEITEC IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, Brno, Czech Republic

    Ivo Kuběna, Tomáš Kruml & Jaroslav Polák

Authors
  1. Ivo Kuběna
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  2. Tomáš Kruml
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  3. Jaroslav Polák
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Correspondence to Ivo Kuběna.

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Kuběna, I., Kruml, T. & Polák, J. Behaviour of ODS Steels in Cyclic Loading. Trans Indian Inst Met 69, 309–313 (2016). https://doi.org/10.1007/s12666-015-0814-3

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  • DOI: https://doi.org/10.1007/s12666-015-0814-3

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