Macroscopic aspects of Lüders band deformation in mild steel

V.S. Ananthan, E.O. Hall

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Details are given of experiments on the propagation of single Lüders bands in mild steel. The results cover the effect of varying grain size on the appearance of the bands in specimens of differing cross-section, and concentrate on the macroscopic shape changes observed following the passage of the band. The results are generally consistent with a shear-flow concept [E. O. Hall, N. J. Carter and G. Vitullo, ICSMA 6, p. 393. Pergamon Press, Oxford (1983)], whereby the Lüders strain arises from a shear which creates both the macroscopic shape changes and sufficient free dislocation for the flow to continue at the lower yield stress. The shear component is strongly dependent on grain size, and at large grain sizes the Lüders band front becomes diffuse. The flow component is more nearly constant. However, the direction of shear is not in the line of greatest slope in the Lüders front, and this points to some other component, such as grip constraints or the bending moment of the specimen, as factors which may influence the shear direction. The same factors may be responsible for influencing the orientation of the Lüders band front.
    Original languageEnglish
    JournalActa Metallurgica et Materialia
    Volume39
    Issue number12
    Pages (from-to)3153-3160
    ISSN0956-7151
    DOIs
    Publication statusPublished - 1991

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