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Microstructure Evolution during Roller Hemming of AZ31B Magnesium Sheet

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Abstract

The differences in the microstructure evolution during laser-roller hemming and conventional roller hemming (done at room temperature) of commercial-grade AZ31B sheet were studied using electron backscatter diffraction (EBSD). It was observed that the flanging operation, done as a precursor to roller hemming, produced a heterogeneous grain structure that remained throughout the subsequent hemming steps. Laser heating, applied during the roller passes, significantly reduced the amount of both extension and contraction twinning in the inner and outer band, respectively. More importantly, after two roller passes without laser heating, extension twinning in the inner band seemed to saturate. This forced the material in the inner band to accommodate further deformation by harder mechanisms, such as pyramidal slip and contraction twinning, during the third roller pass when failure occurred. The laser-hemmed samples exhibited much lower hardness values, especially in the inner band, which was deemed to be largely responsible for the success of the hemming operation with laser heating.

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Acknowledgments

The authors wish to acknowledge gratefully the financial support received for this work through NSF-GOALI Awards 0654179 and 1006784. The authors wish to thank Dr. John Carsley (GM R&D Center, Warren, MI) for supplying the roller-hemmed samples, Mr. Robert Kubic (GM R&D Center, Warren, MI) for help with EBSD data collection, and both for many discussions. A.L. would also like to thank General Motors for providing an internship that permitted this work to be undertaken.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, 19104, USA

    Amanda Levinson (Graduate Student), Roger D. Doherty (Professor Emeritus) & Surya R. Kalidindi (Professor)

  2. Chemical Sciences and Materials Systems Laboratory, Research and Development, General Motors, Warren, MI, 48092, USA

    Raja K. Mishra (Technical Fellow)

  3. Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA, 19104, USA

    Surya R. Kalidindi (Professor)

Authors
  1. Amanda Levinson
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  2. Raja K. Mishra
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  3. Roger D. Doherty
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  4. Surya R. Kalidindi
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Correspondence to Surya R. Kalidindi.

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Manuscript submitted August 19, 2011.

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Levinson, A., Mishra, R.K., Doherty, R.D. et al. Microstructure Evolution during Roller Hemming of AZ31B Magnesium Sheet. Metall Mater Trans A 43, 3824–3833 (2012). https://doi.org/10.1007/s11661-012-1184-7

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