Abstract
Synchrotron X-ray radiography at 125 frames per second was used to study deformation mechanisms in semi-solid Fe-C alloys at high solid fraction and shear strain rates of 10−1/s. An image correlation approach was also used to quantify the shear strain fields and study shear-induced dilation and the origin of shear cracking. It was shown that, at high solid fraction (90 to 93 pct solid), rearrangement including rotation and translation of solid particles became restricted and shear strain localized into narrow liquid-filled channels/fissures. Shear cracking was shown to originate from inadequate liquid flow into the expanding spaces between solid particles caused by shear-induced dilation. At lower solid fraction (~85 pct solid), solid particles rearranged with a significantly higher component of rotation leading to more shear-induced dilation and a wider shear band.
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Acknowledgments
Synchrotron experiments were performed at the 20B2 of SPring-8 under Proposal No. 2009A(B)0014, 2010A1420, 2011A1209. 2011B1096, 2012A1110, 2012B1173, 2013B1242 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI). The in situ observation technique was developed with the support of “ISIJ Innovative Program for Advanced Technology”, ISIJ Research Promotion Grant. Analysis was carried out under JSPS KAKENHI Grant number 24560910, 24246124, 24226018. This collaboration is also supported by a Royal Society Daiwa Anglo-Japanese Foundation International Exchanges Award.
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Manuscript submitted March 7, 2014.
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Nagira, T., Morita, S., Yokota, H. et al. In Situ Observation of Deformation in Semi-solid Fe-C Alloys at High Shear Rate. Metall Mater Trans A 45, 5613–5623 (2014). https://doi.org/10.1007/s11661-014-2489-5
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DOI: https://doi.org/10.1007/s11661-014-2489-5