Strengthening Mechanisms of P/M Extruded Titanium Materials with Additive Hydrogen

Mimoto, Takanori; Li, Shunfeng; Umeda, Junko; Kondoh, Katsuyoshi

doi:10.2497/jjspm.60.467

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…9 On the other hand, hydrogen atom, a β-stabilising element, could be used to control the phase transformation of pure Ti and refine the grain structure due to β-Ti phase particles acting as effective obstacles to α-Ti grain coarsening during hot extrusion. 10,11 In order to introduce oxygen and hydrogen atoms into Ti materials, a PM-based direct consolidation technique was employed in this study. The contribution of the oxygen and hydrogen addition to strengthening behaviour was discussed in detail through the microstructural and mechanical evaluation of extruded Ti–O–H powder materials.…”

Section: Introductionmentioning

confidence: 99%

Strengthening behaviour and mechanisms of extruded powder metallurgy pure Ti materials reinforced with ubiquitous light elements

2016

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Ubiquitous light elements (ULEs) like oxygen (O), nitrogen (N), carbon (C) and hydrogen (H) can be the key additive elements to achieve the high specific strength and cost-effectiveness of powder metallurgy (PM) titanium (Ti) materials. They have high potential to be employed as promising useful reinforcements of conventional expensive alloying elements like vanadium (V) and Niobium (Nb). In this study, two ULEs, oxygen and hydrogen, were induced into pure Ti matrix via the PM route, and then the processed Ti powders were consolidated into the extruded Ti-O-H materials. The additive ULEs' contribution to the microstructures and strengthening behaviour of Ti wrought materials was investigated in detail. The extruded Ti-0.97O-0.11H specimen exhibited an excellent combination of ultimate tensile strength (UTS) of 1158 MPa and tensile elongation of 23.9%, which were superior to those of Ti-6Al-4V alloy (UTS: 1047 MPa, elongation: 16.6%).

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Section: Introductionmentioning

confidence: 99%

Strengthening behaviour and mechanisms of extruded powder metallurgy pure Ti materials reinforced with ubiquitous light elements

2016

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“…Nitrogen can be dissolved into -Ti phase to form an interstitial solid solution in large amounts of approximately 20 at.%, which showed a dramatically high hardness response and tensile strengthening in the Ti matrix [8,9]. On the other hand, hydrogen of -stabilizer could control the phase transformation of pure Ti and make a contribution to fine grain structure due to -Ti phase generated as an obstacle which prevents -Ti grains from coarsening during hot working [10,11]. In order to fabricate the pure Ti based materials with both cost-effectiveness and high mechanical performances, the powder metallurgy (PM) process based direct consolidation technique of titanium hydride (TiH2) powder [12] (as cheaper raw powder for PM Ti materials than pure Ti powders and also hydrogen supplier) and the gas (N2)-solid (pure Ti powder or TiH2 powder compact) direct reaction process in solid-state were employed.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance and Microstructure of Extruded Pure Ti Based Materials Reinforced with Nitrogen and Hydrogen Via Powder Metallurgy Route

Mimoto

Umeda

Kondoh

2016

Proceedings of the 13th World Conference on Titanium

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Utilizing ubiquitous light elements (ULE) like oxygen (O), nitrogen (N), carbon (C) and hydrogen (H) as reinforcements is a promising strategy for developing the novel light metal materials having excellent combination of high specific strength and cost-effectiveness, especially pure titanium (Ti) based materials employing the ULE instead of conventional alloying elements of expensive rare earth like vanadium (V). In this study, nitrogen of the ULE was induced into titanium hydride (TiH2) powder compacts during sintering process combined with dehydrogenation and gas-solid direct reaction technique, and then the treated billets were served to hot extrusion. The effects of nitrogen and hydrogen on the microstructure, mechanical properties and strengthening mechanism of extruded Ti-N-H materials were investigated in detail. For example, the wrought Ti-0.6N-0.07H material exhibited an excellent UTS of 1180 MPa owing to the contributions of both solid solution hardening by solute nitrogen atoms and grain refinement by hydrogen.

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Microstructural Formation Mechanism of α+β Dual Phase Ti-Fe Sintered Alloys via Hot Rolling Process

KARIYA,

TANAKA,

UMEDA

et al. 2024

J. Jpn. Soc. Powder Powder Metallurgy

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Strengthening Mechanisms of P/M Extruded Titanium Materials with Additive Hydrogen

Cited by 6 publications

References 16 publications

Strengthening behaviour and mechanisms of extruded powder metallurgy pure Ti materials reinforced with ubiquitous light elements

Strengthening behaviour and mechanisms of extruded powder metallurgy pure Ti materials reinforced with ubiquitous light elements

Mechanical Performance and Microstructure of Extruded Pure Ti Based Materials Reinforced with Nitrogen and Hydrogen Via Powder Metallurgy Route

Microstructural Formation Mechanism of α+β Dual Phase Ti-Fe Sintered Alloys via Hot Rolling Process

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