Carbide precipitation characteristics in additive manufacturing of Co-Cr-Mo alloy via selective electron beam melting. (15th January 2018)

• Record Type: Journal Article
• Authors: Tan, X.P.; Wang, P.; Kok, Y.; Toh, W.Q.; Sun, Z.; Nai, S.M.L.; Descoins, M.; Mangelinck, D.; Liu, E.; Tor, S.B.
• Is Part Of: Scripta materialia. Number 143(2018)
• Page Start: 117
• Page End: 121
• Publication Date: 2018-01-15
• Subjects: 3D printing -- Electron beam methods -- Atom probe tomography -- Carbides -- Precipitation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.09.022
• Languages: English
• ISSNs: 1359-6462

Abstract

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. M23 C6 and M6 C, which are formed into continuous carbide thin films along columnar grain boundaries. The carbide thin film is found to precipitate coherently with one γCo grain while incoherently with another adjacent one. Moreover, columnar carbide chains or clusters consisting of nanometer-sized, cuboidal particles are precipitated coherently with surrounding γCo phase within interdendritic regions. Graphical abstract: Image 1