Microstructural features of thermochemical processing in a Ti-6Al-4V alloy

Fang, Tun-Ying; Wang, Wen-Hsiung

doi:10.1016/s0254-0584(98)00137-0

Cited by 53 publications

(19 citation statements)

References 12 publications

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“…Hydrides were found in all visual fields of specimens in the Ti600 alloy at the hydrogen content of 0.65 wt pct (Figure 2(b)), and the equiaxed a structure transformed to a fine a + d lamellar structure. Fang et al [15] observed a grains that were split into small packets by hydrides in the hydrogenated Ti6Al4V alloy at lower hydrogenation temperature and higher hydrogen content.…”

Section: A Effect Of Hydrogenationmentioning

confidence: 99%

“…The important role of hydride precipitation in the formation of ultrafine grains through THP has been given in the literature. [8][9][10]15,17] Different researchers have suggested that hydride formation introduces considerable strain into the matrix, and decomposition of these hydrides refines the microstructure. In this article, the important role of hydride during isothermal compression is demonstrated.…”

Section: B Effect Of Plastic Deformation After Hydrogenationmentioning

confidence: 99%

“…[5] Many investigations have been performed to refine the grain structure in titanium alloys through THP processing. [6][7][8][9][10][11][12][13][14][15][16][17] Zhang et al [7] reported that the grains in a-Ti can be refined by hydrogenation/dehydrogenation treatment. Ultrafine-grained a + b titanium alloys with advanced mechanical properties and superplasticity by the application of reversible hydrogen alloying were obtained.…”

Section: Introductionmentioning

confidence: 99%

“…Ultrafine-grained a + b titanium alloys with advanced mechanical properties and superplasticity by the application of reversible hydrogen alloying were obtained. [8][9][10][11][12][13][14][15][16] Recently, Li et al [17] reported the refined lamellar grains formation by THP processing in a near a titanium alloy. Because of their superior microstructural stability, toughness, and excellent specific strength, near a titanium alloys are generally used in structural application at high temperature.…”

Section: Introductionmentioning

confidence: 99%

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Application of Thermohydrogen Processing for Formation of Ultrafine Equiaxed Grains in Near α Ti600 Alloy

Niu

2009

Metall Mater Trans A

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In this article, the grain refinement of the near a Ti600 alloy by thermohydrogen processing (THP) is investigated. The THP processing includes hydrogenation, high-temperature deformation, and vacuum dehydrogenation. The microstructural evolution in each stage of THP processing was carefully investigated by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The experimental results show that face-centered-cubic (fcc) hydride (d phase) precipitates in the hydrogenated Ti600 alloy at the hydrogen contents of 0.31 wt pct and above. The critical role of hydrides in the processing of grain refinement is clearly demonstrated. The hydrides divided the a grains in hydrogenation treatment, promoted a-phase recrystallization, and facilitated the stabilization of finer a grain size in isothermal compression.

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Section: A Effect Of Hydrogenationmentioning

confidence: 99%

Section: B Effect Of Plastic Deformation After Hydrogenationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of Thermohydrogen Processing for Formation of Ultrafine Equiaxed Grains in Near α Ti600 Alloy

Niu

2009

Metall Mater Trans A

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“…% Al, 4 wt. % V) is α + β phase titanium alloy, which occupies about 50% of the total titanium market [1,2]. It is very commonly used in aerospace, automotive, and medical industries, due to its high strength/weight ratio, corrosion resistance, biocompatibility, and low thermal expansion characteristics.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Ti6Al4V Powders Recycled from Turnings via the HDH Technique

Gökelma

Celik

Tazegul

et al. 2018

Metals

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Abstract:The objective of this research is for Ti6Al4V alloy turnings, generated during the machining of implants, to produce powders for the fabrication of Ti base coating via the cold spray method. In order to decrease the cost of powder production and increase the recycling rate of the turnings, the hydrogenation-dehydrogenation (HDH) process has been utilised. The HDH process consists of the following sequence: surface conditioning of the turnings, hydrogenation, ball milling (for powder production), and dehydrogenation. Afterwards, the properties of the recycled powder were analysed via phase, chemical, and morphological examinations, and size and flowability measurements. Usability of the powder in additive manufacturing applications has been evaluated via examining the characteristics of the deposit produced from this powder by the cold spray method. In short, promising results were obtained regarding the potential of the recycled powders in additive manufacturing after making minor adjustments in the HDH process.

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