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Abstract

Carbide precipitation plays a key role in determining mechanical properties of Co-Cr-Mo alloy. Precipitation characteristics of carbides in selective electron beam melting (SEBM)-fabricated Co-Cr-Mo parts have been investigated by atom probe tomography and transmission electron microscopy. We observe co-existence of two types of carbides, i.e. M23C6and M6C, which are formed into continuous carbide thin films along columnar grain boundaries. The carbide thin film is found to precipitate coherently with one γ[sbnd]Co grain while incoherently with another adjacent one. Moreover, columnar carbide chains or clusters consisting of nanometer-sized, cuboidal particles are precipitated coherently with surrounding γ[sbnd]Co phase within interdendritic regions.

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Tan, X. P., Wang, P., Kok, Y., Toh, W. Q., Sun, Z., Nai, S. M. L., … Tor, S. B. (2018). Carbide precipitation characteristics in additive manufacturing of Co-Cr-Mo alloy via selective election beam melting. Scripta Materialia, 143, 117–121. https://doi.org/10.1016/j.scriptamat.2017.09.022

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