Evolution of deformation microstructure in a coarse-grained Fe-Mn-Al-C steel under bending fatigue
Shyamal, S.; Das, S.R.; Jaskari, M.; Sahu, P. (2022-08-13)
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Sisältö avataan julkiseksi: 13.08.2024
Shyamal, S., Das, S. R., Jaskari, M., & Sahu, P. (2022). Evolution of deformation microstructure in a coarse-grained Fe-Mn-Al-C steel under bending fatigue. Materials Letters, 327, 133006. https://doi.org/10.1016/j.matlet.2022.133006
© 2022. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2023041436722
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Abstract
Microstructure evolution during cyclic deformation of a coarse-grained (∼25 μm) high-Mn steel under high-cycle bending fatigue at room temperature is reported. Vickers microhardness initially increased until 10,000 cycles indicating cyclic hardening but almost saturated at prolonged cycling. The cyclic deformation of austenite leads to formation of perfect dislocations and stacking faults, as well as shear bands in the pre-saturation stage, while the formation of minor amount of ∊-martensite was observed at intersections of shear bands at the saturation stage. Dislocation densities estimated by X-ray diffraction were relatively low ∼1014 m−2.
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