Control of the structure of titanium alloys by the method of thermohydrogen treatment

Ilin, Alexander; Скворцова, С. В.; Мамонов, А. М.

doi:10.1007/s11003-008-9088-9

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…Thermohydrogen treatment (THT), which uses hydrogen as a temporary alloying element, can greatly improve the hot workability and refine the microstructure of titanium-based alloys [ 21 , 22 ]. In this process, hydrogen diffuses into the titanium alloy by holding the material at a relatively high temperature under a hydrogen-containing atmosphere for several hours.…”

Section: Introductionmentioning

confidence: 99%

Effects of Melt Hydrogenation on the Microstructure Evolution and Hot Deformation Behavior of TiBw/Ti-6Al-4V Composites

Yan

Wang

Wang³

et al. 2023

Materials

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In this study, Ti-6Al-4V matrix composites reinforced with TiB ceramic whiskers were in situ synthesized and hydrogenated using the melt hydrogenation technique (MHT). The effects of MHT on the microstructure evolution and hot compression behavior of the composites were investigated by optical microscopy (OM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). Hot compression tests were performed at strain rates of 0.1/s, 0.01/s, and 0.001/s and temperatures of 800 °C, 850 °C, and 900 °C; the hot workability of composites significantly improved after hydrogenation, for example, the 900 °C peak flow stress of hydrogenated composites (43 MPa) decreased by 53.76% compared with that of unhydrogenated ones (93 MPa) at a strain rate of 0.01/s. Microstructural observations show that MHT can effectively facilitate the dispersion of TiB whiskers and induce the α/β lath refinement of the matrix in our as-cast hydrogenated composite. During hot compression, MHT effectively promoted the as-cast composite microstructure refinement, accelerated the dynamic recrystallization (DRX) generation, and reduced the stress concentration at the interface between the reinforcement and matrix; in turn, the hydrogenated composites presented low peak stress during hot compression.

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Section: Introductionmentioning

confidence: 99%

Effects of Melt Hydrogenation on the Microstructure Evolution and Hot Deformation Behavior of TiBw/Ti-6Al-4V Composites

Yan

Wang

Wang³

et al. 2023

Materials

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“…THT usually consists of the process sequence solution treatment (ST), diffusion-controlled hydrogen uptake (hydrogenation), hydrogen degassing (dehydrogenation) and aging. With few exceptions [3] it is applied to Ti alloys only, aiming for homogeneous microstructure adaptation [4][5][6][7][8][9][10][11][12] and the generation of microstructural gradient [13,14]. A schematic visualization of the process, embedded into the Ti-6Al-4V/hydrogen phase diagram is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the temperature of solution treatment can be lowered, reducing grain growth during the process as compared to conventional heat treatment (solution treatment and aging) of Ti alloys, if hydrogenation is applied before the ST. Secondly, when the hydrogenation concentration in a sample exceeds the maximum hydrogen solubility, hydrogen evokes hydride formation, which is associated with local volume expansion. The hydride-induced volume expansion in the α and β phase reaches a value between 17% and 25%, depending on the underlying solid solution (chemical composition) [5]. After the hydrides are dissolved during dehydrogenation, dislocations and vacancies remain, which act as additional nucleation sites for precipitates.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen as a Temporary Alloying Element for Establishing Specific Microstructural Gradients in Ti-6Al-4V

Schmidt

Christ

Hehl

2022

Metals

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Parts of vehicles, such as landing gear components of aircrafts, are subject to growing demands in terms of sustainability via lightweight design and durability. To fulfill these requirements, the development of thermochemical processes is auspicious. Titanium alloys allow a heat treatment in hydrogen-containing atmosphere for temporary hydrogen alloying, often called thermohydrogen treatment (THT). The investigation presented intends to realize a local microstructure modification of Ti-6Al-4V by means of THT. The study aims to use hydrogen (H) as a promoter for changing the local distribution and morphology of strengthening precipitates during THT as well as the local grain size (microstructural gradient). Both shall improve the fatigue properties of the material after hydrogen degassing. To derive suitable thermohydrogen treatment process parameters, the resulting fatigue crack propagation resistance and fracture toughness after different solution heat treatments are determined experimentally and compared to each other. Moreover, various graded microstructures are evaluated after hydrogen uptake (hydrogenation) and hydrogen degassing (dehydrogenation) using numerically simulated hydrogen concentration profiles, observed hardness curves, metallographically determined microstructure gradients and the corresponding results of the phase analysis by means of X-ray diffraction. The study shows that hydrogenation at 500 °C and dehydrogenation at 750 °C enables the generation of a promising microstructural gradient.

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“…THP of alloys allows one to form structures that are unachievable in conventional ways [5][6][7][8][9][10][11][12]. So, the complementary hydrogenation may transform a coarse lamellar cast structure of near-α and α + β alloys in a fine lamellar at the nanoscale level [13] or even create a composite structure of the same classes of alloys composed of particles of the aluminum-rich α phase to the formation of ordered particles of the α 2 phase (Ti 3 Al), aluminum-depleted α phase, and β phase [14]. This opens up particularly wide prospects, because the aluminum-depleted matrix leads to prerequisites for reducing flow stress in the materials and consequently for attaining a superplastic state.…”

Section: Introductionmentioning

confidence: 99%

Research on Submicron-Grained Structure Formation in Titanium Alloys upon Reversible Hydrogenation and Plastic Deformation

Pаnin

Манохин

Dzunovich

2018

Inorg. Mater. Appl. Res.

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The influence of thermohydrogen treatment combined with hot rolling on the structural formation in αand near-α-titanium alloys has been studied. The prospects of obtaining submicron-grained sheet semifinished products of VT5 (Ti-5.8Al-0.1Fe, wt %) and VT20 (Ti-5.9Al-1.5V-1.2Mo-1.8Zr-0.1Fe, wt %) alloys are shown. In these materials, a submicron-grained structure allows the plastic deformation to be induced by superplasticity at temperatures reduced by 100-200°С.

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Control of the structure of titanium alloys by the method of thermohydrogen treatment

Cited by 9 publications

References 2 publications

Effects of Melt Hydrogenation on the Microstructure Evolution and Hot Deformation Behavior of TiBw/Ti-6Al-4V Composites

Effects of Melt Hydrogenation on the Microstructure Evolution and Hot Deformation Behavior of TiBw/Ti-6Al-4V Composites

Hydrogen as a Temporary Alloying Element for Establishing Specific Microstructural Gradients in Ti-6Al-4V

Research on Submicron-Grained Structure Formation in Titanium Alloys upon Reversible Hydrogenation and Plastic Deformation

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