Abstract
The Mn-steel matrix composite locally reinforced with in situ TiC–TiB2 ceramic particulate was successfully fabricated using a thermal explosion-casting route in a Cu–Ti–B4C system with various B4C particle sizes. With the increase of B4C particle size, the ignition temperature increased, the combustion temperature decreased, and the size of the TiC and TiB2 ceramic particulates became smaller. The hardness, friction coefficient, and wear resistance of the composite were higher than those of the Mn-steel matrix. With the increase of B4C particle size, the size of the TiC and TiB2 ceramic particulates fabricated in the local reinforcing region decreased, the interface bonding between reinforcing region and matrix became poor, and the number of pores in the local reinforcing region increased. Moreover, the composite with ∼3.5 μm B4C showed the best antiwear property. At a low load of 20 N, the dominant wear mechanisms of the Mn-steel matrix composite were microcutting and abrasive wear. While, at a high load of 80 N, the dominant wear mechanisms were microcutting and adhesion wear associated with the formation of delamination layer.
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ACKNOWLEDGMENTS
This work is supported by Cooperative Innovation Platform of National Oil Shale Exploration Development and Research, the National Natural Science Fundation (No. 51205160 and 51375006), the Science and Technology Development Project of Jilin Province (No. 201201025 and 20140520121JH), and the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20120061120110).
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Liang, Y., Zhao, Q., Zhang, Z. et al. In situ fabrication of TiC–TiB2 precipitates in Mn-steel using thermal explosion (TE) casting. Journal of Materials Research 30, 1019–1028 (2015). https://doi.org/10.1557/jmr.2015.76
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DOI: https://doi.org/10.1557/jmr.2015.76