Enhanced Densification and Hardness of Titanium Bodies Sintered by Advanced Hydrogen Sintering Process

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

doi:10.1007/s12540-018-0134-3

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…Only α and β phases existed without the formation of additional phases before and after dehydrogenation. There was no hydride after CHH, which was the same as the previous study [25]. Al was sufficiently diffused because specimens were heat treated at a high temperature of 800°C or higher, and then no Ti3Al phase was remained.…”

Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

“…In our previous research, the hydrogen sintering process (HSP) using Core time Hydrogen Heat treatment (CHH) was developed [22]. The HSP could improve the sinterability of alloys [23][24][25]. In addition, the CHH was applied to Ti-6Al-4V powders, and as a result, it was found that the CHH could improve the oxidation resistance of Ti-6Al-4V powders [26].…”

Section: Introductionmentioning

confidence: 99%

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Effect of α-lath size on the mechanical properties of Ti–6Al–4V using core time hydrogen heat treatment

Cho

Kwon

et al. 2020

Materials Science and Technology

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When hydrogen is dissolved, brittleness occurs in the material. However, in the case of titanium and titanium alloy, hydrogen can be temporarily dissolved and removed, thereby improving the mechanical properties of titanium and titanium alloy. In this study, Core time Hydrogen Heat treatment (CHH) applies to Ti–6Al–4V alloy to improve mechanical properties. CHH was performed at 800°C and 1000°C for 2 h. Thereafter, dehydrogenation was performed for 2 h at 700°C in vacuum atmosphere to remove residual hydrogen. After the CHH at 800°C, it was found that the α-lath size in the Ti–6Al–4V was narrowed; thereby increasing the Vickers hardness and tensile strength without decreasing in elongation.

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Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of α-lath size on the mechanical properties of Ti–6Al–4V using core time hydrogen heat treatment

Cho

Kwon

et al. 2020

Materials Science and Technology

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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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Comparison of deoxidation capability on the specific surface area of irregular titanium powder using calcium reductant

Hong

Lim

2019

Advanced Powder Technology

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Enhanced Densification and Hardness of Titanium Bodies Sintered by Advanced Hydrogen Sintering Process

Cited by 4 publications

References 14 publications

Effect of α-lath size on the mechanical properties of Ti–6Al–4V using core time hydrogen heat treatment

Effect of α-lath size on the mechanical properties of Ti–6Al–4V using core time hydrogen heat treatment

Powder Casting: Producing Bulk Metal Components from Powder Without Compaction

Comparison of deoxidation capability on the specific surface area of irregular titanium powder using calcium reductant

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