Carbide precipitation characteristics in additive manufacturing of Co-Cr-Mo alloy via selective electron beam melting

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Scripta Materialia, ISSN: 1359-6462, Vol: 143, Page: 117-121

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X. P. Tan; Y. Kok; W. Q. Toh; Z. Sun; E. Liu; S. B. Tor; P. Wang; S. M.L. Nai; M. Descoins; D. Mangelinck
Elsevier BV
Materials Science; Physics and Astronomy
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article description
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. M 23 C 6 and M 6 C, which are formed into continuous carbide thin films along columnar grain boundaries. The carbide thin film is found to precipitate coherently with one γ 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 Co phase within interdendritic regions.