Variation in lattice parameters and strain of sintered titanium powder by advanced hydrogen sintering process

Oh, Jae Min; Koo, Jageon; Lim, Joo Won

doi:10.1016/j.powtec.2018.02.018

Cited by 11 publications

(1 citation statement)

References 14 publications

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“…[6][7][8] However, similar results are obtained by using a H 2 -containing atmosphere, instead of vacuum or inert gas, to sinter elemental Ti powders. [9][10][11] Over the last decade, the authors and their collaborators have developed a process named hydrogen sintering and phase transformation (HSPT), a blended elemental press-and-sinter PM process. [12][13][14] This process was developed to produce high-performance titanium alloys with wrought-like microstructures and properties using only low-cost feedstocks and processing.…”

Section: Introductionmentioning

confidence: 99%

Powder Casting: Producing Bulk Metal Components from Powder Without Compaction

Paramore

Dunstan

Butler

et al. 2020

JOM

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Powder casting was developed to produce metal components with near-theoretical density from low-cost, loose powder using hydrogen sintering and phase transformation. This has significant implications for non-beam metal additive manufacturing processes (e.g., metal extrusion AM, binder jetting, and ordered powder lithography), which produce green parts with relatively low densities. Additionally, powder casting can enable the production of geometries typically not suitable for powder processing, such as plate and bar stock. In the current study, Ti-6Al-4V, Zr, and Hf were densified to 99.2%, 95.7%, and 94.0% of their respective theoretical densities, when sintered from loose powder at 1200°C for 4 h. The relative density and pore size distributions of Ti-6Al-4V produced by powder casting were very similar to those produced by press-and-sinter HSPT. The powder-cast Ti-6Al-4V samples also displayed ductility consistent with press-and-sinter HSPT. However, they exhibited lower strength due to unintentional overheating during the dehydrogenation step.

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