Abstract
The growth mechanism of primary and eutectic TiB2 particles in a hypereutectic steel matrix composite (SMC) has been investigated by combining microstructure and crystallographic analysis in the present work. It is found that the TiB2 particles in the as-cast microstructure have complex morphologies including two kinds of primary particles and several categories of eutectic particles. Twin-induced dendritic growth of primary TiB2 particles and epitaxial growth of eutectic fibers are found in the present SMC by detailed crystallography analysis. Furthermore, we demonstrate that the crystallographic features strongly affect the solidification process and the final microstructures. Finally, several alloying strategies are proposed to control the solidification microstructure.
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Acknowledgments
M.X. Huang acknowledges the support from the Steel Joint Funds of the National Natural Science Foundation of China (Grant No. U1560204) and the support from Research Grants Council of Hong Kong (Grants Nos. HKU719712E, HKU712713E).
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Manuscript submitted September 15, 2016.
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Luo, Z.C., He, B.B., Li, Y.Z. et al. Growth Mechanism of Primary and Eutectic TiB2 Particles in a Hypereutectic Steel Matrix Composite. Metall Mater Trans A 48, 1981–1989 (2017). https://doi.org/10.1007/s11661-017-4001-5
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DOI: https://doi.org/10.1007/s11661-017-4001-5