Comparison the Preparation Methods of Powder Feedstock for Laser Powder Bed Fusion

Химич, М. А.; Ibragimov, Egor A.; Chebodaeva, Valentina V.; Сапрыкин, А.А.; Saprykina, Natalya A.; Sharkeev, Yuriy P.

doi:10.4028/p-7tc3od

Cited by 3 publications

(2 citation statements)

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“…As described in [29], the microstructure of the as-produced samples was represented by dendrites with a space between them less than 2 µm (Fig. 1a).…”

Section: Resultsmentioning

confidence: 89%

“…The lattice parameters of both phases did not correspond to the etalon. This was due to the formation of solid solutions on the basis of two possible Co lattices, corresponding to high-and low-temperature ε-and γ-phases [29,31]. It should be noted, that here and further ε, γ, σ and µ symbols are used to define the type of lattice, which are hcp, fcc, tetragonal and rhombohedral, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Influence of thermal treatment duration on structure and phase composition of additive Co-Cr-Mo alloy samples

et al. 2022

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Laser powder bed fusion (LPBF) requires application of powders with specific characteristics. These are near-spherical shape of particles, uniform elemental composition, typical particle size of 5 -70 µm, etc. Such powders are produced by spheroidization methods. They have such disadvantages as high cost and sale only in large quantities. There are publications describing application in LPBF powders, produced by the methods, alternative to spheroidization. In the current study, powders of pure raw Co, Cr and Mo were used for the production of Co-Cr-Mo powder mixture. Samples of Co-28 wt.% Cr-6 wt.% Mo alloy were produced by LPBF from this powder mixture. Due to the difference between melting temperatures of Co, Cr and Mo, inclusions of Cr and Mo were formed within the bulk of samples. Studies of phase and elemental composition, structure and microhardness of the as-produced samples and after post-treatment with varied duration are represented. As-produced samples have non-uniform elemental composition and are represented by the main Co-based phase. Increasing the annealing duration leads to the sequential dissolution of un-melted Cr and Mo inclusions. Complete dissolution of Cr particles was observed at 10 hours of treatment and complete dissolution of Mo particles was not observed after 20 hours of annealing. Microhardness non-linearly changes with the increasing duration of annealing. This is due to the phase transformations and diffusion processes occurring at such type of post-treatment. Complete dissolution of Mo-particles could be achieved by further increasing the annealing time or by varying the mode of laser powder bed fusion.

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“…As described in [29], the microstructure of the as-produced samples was represented by dendrites with a space between them less than 2 µm (Fig. 1a).…”

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%