Deformation-induced center segregation in twin-roll cast high-Mg Al–Mg strips

  • vsundar
    Keymaster
    40

    #2897

    The formation mechanism of center segregation in twin-roll cast (TRC) Al–Mg strips was studied. The center segregation was found to gradually change from channel segregation to a segregation band with increasing casting speed. Deformation induced by the roll separating force (RSF) was the main mechanism of center segregation in the TRC strips. The dilatant behavior of dendrite cells under the RSF appears to be the main mechanism for the formation of segregation band. At relatively low casting speeds, a low compression rate can cause the liquid to squeeze toward the transverse and melt pool directions to form channel segregation.

    An automatic serial sectioning machine (UES Inc., Robo-Met. 3D) and 3-D analysis software (FEI, Avizo Fire 7) were used for three-dimensional characterization of the center segregation. Three-dimensional images of Mg-rich phases were obtained by image segmentation by thresholding, image processing using a median filter and size filter, and 3-D surface generation.

    Kim, M. S., Kim, S. H., & Kim, H. W. (2018). Deformation-induced center segregation in twin-roll cast high-Mg Al–Mg strips. Scripta Materialia, 152, 69-73.

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Deformation-induced center segregation in twin-roll cast high-Mg Al–Mg strips