Abstract
A Ni/Ti composite coating enhanced by an in situ synthesized TiN phase was fabricated on FV520B steel by plasma cladding technology. The in situ formation of the TiN phase was confirmed by XRD, SEM, and TEM. The cladding layer consisted of three regions on going from the top to the bottom, namely, columnar grain regions, columnar dendritic regions, and fine grain regions. The cladding layer was composed of Ni3Ti, TiN, (Fe, Ni), and Ti phases. The dendritic and columnar regions were mainly composed of the Ni3Ti and (Fe, Ni) phases. The Ti phase was observed at the branches of dendrite crystals and columnar grains. The volume fraction of the TiN phase in the cladding layer was about 3.2%. The maximum micro-hardness value of the in situ formed coating (760 HV0.2) was higher than that of the pure coating (537 HV0.2). The cladding layer had a small amount of scratch and wear debris when a load of 20 N was used. As the test load increased, the wear debris in the cladding layer also increased and the massive furrows were not observed.
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Acknowledgments
This work was financially supported by the National Basic Research Program of China (973 Program) (No. 2011CB013404), National Natural Science Foundation of China (No. 51275105, 51375106), China Postdoctoral Science Foundation (2015M571391), Hei Long Jiang Postdoctoral Foundation (LBH-Z14050), and Fundamental Research Funds for the Central Universities (No. HEUCF).
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Jin, G., Li, Y., Cui, H. et al. Microstructure and Tribological Properties of In Situ Synthesized TiN Reinforced Ni/Ti Alloy Clad Layer Prepared by Plasma Cladding Technique. J. of Materi Eng and Perform 25, 2412–2419 (2016). https://doi.org/10.1007/s11665-016-2058-8
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DOI: https://doi.org/10.1007/s11665-016-2058-8