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Probing the effect of intragranular premature κ-carbide on incipient plasticity behavior in austenite-based Fe-Mn-Al-(Cr)-C steels

Abstract : The effect of nanoscale intragranular premature κ-carbide precipitates, having an ordered structure but without chemical partitioning, on the incipient plasticity behavior of austenite in Fe-Mn-Al-(Cr)-C low-density steels was investigated by nanoindentation. We found that the incipient plasticity was dominated by a heterogeneous dislocation nucleation mechanism via atom-vacancy exchange. Although the content of κ-carbide decreased with Cr addition, its negligible effect on incipient plasticity strength was witnessed by the slightly increased shear stress for dislocation nucleation. Comparatively, the increased interstitial C atoms with Cr content in austenite enhanced lattice cohesions which impeded the nucleation events by increasing the requisite shear stress.
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https://hal.univ-lille.fr/hal-03549234
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Soumis le : lundi 31 janvier 2022 - 12:34:03
Dernière modification le : mercredi 23 mars 2022 - 15:51:30

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Jianlei Zhang, yuxiang Liu, Conghui Hu, Ahmed Addad, Alex Montagne, et al.. Probing the effect of intragranular premature κ-carbide on incipient plasticity behavior in austenite-based Fe-Mn-Al-(Cr)-C steels. Materials Research Letters, Taylor & Francis, 2022, Materials Research Letters, 10 (3), pp.141-148. ⟨10.1080/21663831.2022.2027034⟩. ⟨hal-03549234⟩

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