Influence of hydride-induced microstructure modification on mechanical properties of metastable beta titanium alloy Ti 10V-2Fe-3Al

Macin, Vitali; Christ, Hans‐Jürgen

doi:10.1016/j.ijhydene.2015.06.167

Cited by 26 publications

(16 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The material used for the preparation of samples with known high hydrogen content and tested with the hydrogen analyzer calibration must have a number of properties: High sorption rates under hydrogenation conditions; a stable state of hydrogen without the possibility of desorption under standard temperature and pressure; cost-effectiveness; accessibility; and safety when handling. In this paper, technically pure titanium alloy was chosen as the material that satisfies the above conditions; it has also been thoroughly studied [39][40][41][42][43][44][45][46][47]. The samples for hydrogenation were made of 3 mm long wire that was 2.5 mm in diameter.…”

Section: Methodsmentioning

confidence: 99%

Quantitative and Qualitative Analysis of Hydrogen Accumulation in Hydrogen-Storage Materials Using Hydrogen Extraction in an Inert Atmosphere

Babikhina

Kudiiarov

Mostovshchikov

et al. 2018

Metals

View full text Add to dashboard Cite

Currently, standard samples with high hydrogen concentrations that meet the requirements of hydrogen extraction in an inert atmosphere are not currently available on the market. This article describes the preparation of Ti-H standard samples and the calibration of RHEN602, a hydrogen analyzer, using LECO (LECO, Saint Joseph, MI, USA). Samples of technically pure titanium alloy were chosen as the material for sample production. The creation procedure includes five main steps: sample preparation (polishing to an average roughness of 0.04 μm using sandpaper), annealing, hydrogenation, maintenance in an inert gas atmosphere, and characterization of the samples. The absolute hydrogen concentration in the samples was determined by two methods: volumetric and mass change after the introduction of hydrogen. Furthermore, in-situ X-ray diffraction, temperature programmed desorption (TPD) analysis, and thermogravimetric analysis were used during measurements to investigate the phase transitions in the samples. As a result of this work, a series of calibration samples were prepared in a concentration range up to 4 wt % hydrogen, optimal parameters for measuring high concentrations of hydrogen. The calibration line was obtained and the calibration error was 10%.

show abstract

Section: Methodsmentioning

confidence: 99%

Quantitative and Qualitative Analysis of Hydrogen Accumulation in Hydrogen-Storage Materials Using Hydrogen Extraction in an Inert Atmosphere

Babikhina

Kudiiarov

Mostovshchikov

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…Ti alloys play an important role in this case, since they are an essential material for aviation [3] and are classified according to the β phase stability into the alloy classes α(hex)-, (α+β)-and β(bcc)-Ti alloys [4]. Due to the high gas solubility of the β phase and the complete reversibility of the metal-gas reaction, temporary alloying with atomic H is possible as part of a thermal treatment, the so-called thermos hydrogen treatment (THT) [5]. Senkov and Froes [6] conditiond the possibility of using H as a temporary alloying element to improve the mechanical properties in Ti and its alloys, while Piskovets [7] also tried to use THT on steel.…”

Section: Introductionmentioning

confidence: 99%

“…The H effects that influence the microstructure can have a positive effect on the mechanical properties of the material. They can be described by two main phenomena: First, H is a strong β stabilizing element in Ti alloys, lowering the β transus temperature Tβ to Tβ(H) and thus reducing grain growth during solution treatment compared to conventional heat treatment (solution treatment and aging) of Ti alloys [10]. Secondly, when the maximum H solubility is exceeded, H causes hydride formation, which is associated with local volume expansion deforming the surrounding lattice plastically [11].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of THT-Induced Microstructure Gradients and Their Effects on Fatigue Properties in Additively Manufactured Cylindrical and in Conventionally Manufactured Tube-Like Ti-6Al-4V Specimens

Schmidt,

El-Chaikh,

Danzig

et al. 2024

Preprint

View full text Add to dashboard Cite

Technical components should be produced sustainably and are subject to growing demands in terms of durability and reliability. To meet these expectations, the development of thermochemical processes is auspicious. Titanium alloys, which have a comparatively high gas solubility, allow temporary hydrogen (H) loading, often called thermo hydrogen treatment (THT). THT causes lattice deformation and reduces the β transformation temperature. These effects enable an adjustment of the microstructure, which improves the mechanical properties as compared to those produced conventionally. Furthermore, the process is applicable to complex geometries that cannot be surface hardened by mechanical surface treatment techniques. The investigation presented intends to realize a local microstructure gradient in additively via laser-powder bed fusion (L-PBF) manufactured cylindrical Ti–6Al–4V specimens by changing the distribution and morphology of strengthening precipitates as well as the β grain size depending on the distance to the surface, which should improve the material fatigue properties. To evaluate the mechanical properties of such THT-induced microstructure gradients, the resulting change in fatigue life in the LCF and HCF range was determined by stress-controlled cyclic deformation tests. Besides, the resulting microstructure was characterized by means of XRD and TEM. In addition to the additively manufactured and thermo hydrogen treated cylindrical specimens, conventionally produced tube-like specimens were thermo hydrogen treated and examined. For the THT-induced microstructure gradients, numerically simulated H concentration profiles as well as experimentally determined hardness profiles were used for the evaluation of the THT process. The study shows that H-loading at 500°C and H-degassing at 750°C, followed by aging at 550°C, allows the establishment of a microstructure gradient that shows an 8% improvement in fatigue properties compared to a reference condition without THT. The reason for this improvement is an increased volume fraction secondary alpha phase in the near-surface area of the specimens. Moreover, the results show that the process is applicable a tube-like specimen with varying wall thicknesses.

show abstract

“…Titanium alloys are classified according to the β (bcc) phase stability into the alloy classes α(hex), (α + β) and β titanium (Ti) alloys [1]. Due to the high gas solubility of the β phase and the complete reversibility of the metal-gas reaction, temporary alloying with atomic hydrogen (H) is possible as part of a thermal treatment, a so-called thermohydrogen treatment (THT) [2]. THT usually consists of the process sequence solution treatment (ST), diffusion-controlled hydrogen uptake (hydrogenation), hydrogen degassing (dehydrogenation) and aging.…”

Section: Introductionmentioning

confidence: 99%

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

Schmidt

Christ

Hehl

2022

Metals

View full text Add to dashboard Cite

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.

show abstract

Influence of hydride-induced microstructure modification on mechanical properties of metastable beta titanium alloy Ti 10V-2Fe-3Al

Cited by 26 publications

References 36 publications

Quantitative and Qualitative Analysis of Hydrogen Accumulation in Hydrogen-Storage Materials Using Hydrogen Extraction in an Inert Atmosphere

Quantitative and Qualitative Analysis of Hydrogen Accumulation in Hydrogen-Storage Materials Using Hydrogen Extraction in an Inert Atmosphere

Feasibility of THT-Induced Microstructure Gradients and Their Effects on Fatigue Properties in Additively Manufactured Cylindrical and in Conventionally Manufactured Tube-Like Ti-6Al-4V Specimens

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

Contact Info

Product

Resources

About