Hydrogen Influence on Martensitic Transformation and Shape Memory Effect in Titanium Alloys

Ilyin, Alexander P.; Kollerov, M. Yu.; Мамонов, А. М.; Krastilevsky, A.A.; Makarenkov, D.Yu.

doi:10.1051/jp4/1995581145

Cited by 7 publications

(4 citation statements)

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“…The retention of a large amount of the residual b phase at room temperature in conventional (azb) titanium alloys as a result of hydrogen alloying can produce effects such as transformation induced plasticity (TRIP) and non-linear elasticity. 65 The former is observed when the martensite transformation is induced by strain and the latter occurs when the transformation is induced by stress and is reversible during unloading. 65 Hydrogen assisted cleaning and diffusion bonding of the metal surfaces can be used in the processing of powder metallurgy products and composites.…”

Section: Basic Principles Of Thpmentioning

confidence: 99%

“…65 The former is observed when the martensite transformation is induced by strain and the latter occurs when the transformation is induced by stress and is reversible during unloading. 65 Hydrogen assisted cleaning and diffusion bonding of the metal surfaces can be used in the processing of powder metallurgy products and composites. [66][67][68] Hydrogen induced enhanced processability…”

Section: Basic Principles Of Thpmentioning

confidence: 99%

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Hydrogen as a temporary alloying element in titanium alloys: thermohydrogen processing

Froes¹,

Senkov²,

Qazi³

2004

International Materials Reviews

218

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Thermohydrogen processing is a technique in which hydrogen is used as a temporary alloying element in titanium alloys to control the microstructure and improve the final mechanical properties. Thermohydrogen processing can also be used to enhance the processability/ fabricability of titanium products including sintering, compaction, machining, and hot working (forging, rolling, superplastic forming, etc.). In the case of near net shapes, such as castings and powder metallurgy products, thermohydrogen processing is the only method available for significant microstructural modifications and consequent enhancement in mechanical properties. This paper reviews the status of the methods and applications of thermohydrogen processing to titanium alloys. Principles of thermohydrogen processing, based on the hydrogen induced alterations of the phase compositions and the kinetics of phase reactions in hydrogenated titanium alloys, are overviewed. Stable and metastable phase diagrams of several titanium alloys containing hydrogen are also reviewed. Different applications of thermohydrogen processing for titanium alloys, such as processing, forming, microstructural modifications and improvement in mechanical properties are also discussed.

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Section: Basic Principles Of Thpmentioning

confidence: 99%

Section: Basic Principles Of Thpmentioning

confidence: 99%

Hydrogen as a temporary alloying element in titanium alloys: thermohydrogen processing

Froes¹,

Senkov²,

Qazi³

2004

International Materials Reviews

218

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“…Most probably, the H content in the hcp martensitic phase rapidly reaches the solubility limit, which leads to the precipitation of δ A -hydride along with orthorhombic martensite α". As hydrogen increases, the thermodynamic stability of the β-phase is altered and lowers the temperature of the reverse martensite transformation (α"→ β) down to room temperature at high enough concentrations (the hydrogen content reached more than 0.5 wt% in this sample, as presented in Table 2) [34]. The martensite transformed, to a large extent, into the β-phase (Figure 3a), capturing the most hydrogen entering the material.…”

Section: Hydrogen Distribution In Ti-al6-v4 Microstructurementioning

confidence: 86%

Hydrogen Embrittlement of Ti-Al6-V4 Alloy Manufactured by Laser Powder Bed Fusion Induced by Electrochemical Charging

Roudnicka,

Kacenka,

Dvorsky

et al. 2024

Metals

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The 3D printing of Ti-Al6-V4 alloy is subject to much current investigation, with Laser Beam Powder Bed Fusion (PBF-LB/M) being one of the most applied technologies. Ti-Al6-V4 alloy, despite its great material properties, is susceptible to hydrogen penetration and consequent embrittlement. The level of susceptibility to hydrogen penetration depends on the microstructural state of the alloy. In this work, we compare the effect of electrochemical charging by hydrogen on Ti-Al6-V4 alloy prepared by PBF-LB/M, either in the as-built state or annealed, and conventionally prepared alloy. At the same charging conditions, considerably different hydrogen concentrations were achieved, with the as-built 3D-printed material being the most susceptible. The changes in mechanical properties are discussed in relation to changes in microstructure, studied using microscopy, X-ray, and electron diffraction techniques.

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“…After this treatment the structure of the specimens is represented by a mechanically unstable 13-phase that transforms into et"-martensite under the action of stresses [6,7]. After this treatment the structure of the specimens is represented by a mechanically unstable 13-phase that transforms into et"-martensite under the action of stresses [6,7].…”

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confidence: 99%

Mechanisms of change of shape in deforming and heating titanium alloys with the shape memory effect

et al. 1998

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Alloys with the shape memory effect based on titanium nickelide are well known and used quite widely in medicine, aircraft and spacecraft engineering, and other fields of mschine building. These alloys are used in creating thermomechanical parts of structures, temperature-sensitive gauges, and thermoregulators. Titanium alloys with the shape memory effect that possess high damping properties are used when vibrations and noise have to be limited in order to provide effective operation of machine parts and engineering systems as a whole. Commercial titanium-base alloys have lower characteristics of shape regeneration than alloys based on titanium nickelide. However, commercial alloys are much less expensive and are used to produce a wide range of semifinished products. In these materials the characteristics or shape regeneration and damping are often determined by the mechanism of change of shape in deformation, which has not yet been studied appropriately. The present work is devoted to the mechanisms of inelasticity in titanium alloys in various stages of the action of the shape memory effect.

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Hydrogen Influence on Martensitic Transformation and Shape Memory Effect in Titanium Alloys

Cited by 7 publications

References 0 publications

Hydrogen as a temporary alloying element in titanium alloys: thermohydrogen processing

Hydrogen as a temporary alloying element in titanium alloys: thermohydrogen processing

Hydrogen Embrittlement of Ti-Al6-V4 Alloy Manufactured by Laser Powder Bed Fusion Induced by Electrochemical Charging

Mechanisms of change of shape in deforming and heating titanium alloys with the shape memory effect

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