On the Hydrogen Embrittlement of Commercially Pure Alpha Titanium: An Example from the Petrochemical Industry

Tawancy, H. M.

doi:10.1007/s11665-016-2464-y

Cited by 14 publications

(5 citation statements)

References 20 publications

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“…On the RD map, the maximum intensities show the grains are located in and (2-1-10). On ND map, most grains are located in (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23). It means that:…”

Section: Figure 5: Ipf Maps In Different Directions Of Asr (A) Reprementioning

confidence: 99%

“…Due to the difference in lattice volume of both phases [11], [13], mechanical stresses are introduced into the metal [14], [15]. As a consequence, when hydrides are present in the material, they lead to plastic strain and hardening of the material [12], [16]- [18]. The corresponding modification of mechanical and chemical properties of the material can introduce stress corrosion cracking.…”

Section: Introductionmentioning

confidence: 99%

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Impact of rolling conditions on the hydriding of grade 2 titanium welded tubes

et al. 2020

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In this article, we study the impact of rolling conditions on the texture of the commercially pure titanium grade 2. In a previous work, NEOTISS in collaboration with ICB laboratory, shown that the texture highly influences the precipitation of hydrides in Titanium. In order to create different textures, Titanium sheets grade 2 are cold rolled asymmetrically and symmetrically with or without lubricant. The inverse pole figures and direct pole figures obtained allow us to deduce that symmetrical cold rolling does not change the grains orientation but generates a rotation of grains along c-axis (normal to basal plan). However, asymmetrical cold rolling leads to the formation of a new crystallographic texture, which could limit the formation of the hydrides in titanium grade 2 submitted to a hydrogen-rich environment. Key words: asymmetrical rolling, symmetrical rolling, titanium, hydriding, texture

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Section: Figure 5: Ipf Maps In Different Directions Of Asr (A) Reprementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of rolling conditions on the hydriding of grade 2 titanium welded tubes

et al. 2020

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“…Titanium alloys are not exceptional to hydrogen embrittlement (HE) when examined in large grained specimens at moderate and low strain rates in uniaxial tensile tests. 30–33 In addition, titanium alloys are vulnerable to the occurrence of a notch, high strain rates and at low temperatures. The most recent outcome is reported as a consequence of the development of both void link-up and void nucleation at biaxial stresses or big grain sizes are the reasons for HE.…”

Section: Introductionmentioning

confidence: 99%

A critical appraisal of laser peening and its impact on hydrogen embrittlement of titanium alloys

Rajyalakshmi

Swaroop

2019

Proceedings of the Institution of Mechanical Engineers, Part B:

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Many efforts have been made to understand the effects of hydrogen on titanium alloys, resulting in an abundance of theoretical models and papers. Titanium alloys are crucial advanced materials that provide an excellent combination of a high strength-to-weight ratio and good corrosion behaviour even though they are reasonable to corrosion attack. Titanium alloys are susceptible to hydrogen embrittlement when comes into contact with hydrogen, and galvanic pair with an active metal current, or the pH is greater than 12 or less than 3 or an impressed current. In view of the fact that hydrogen behaves differently with α and β phases, hydrogen degradation may vary markedly in titanium alloys. Hydrogen diminishes the corrosion and erosion resistance and fatigue life of in-service titanium components. A laser peening or laser shock peening is a novel technique for making the metal surfaces and sub-layers densify. It evokes that laser shock peening adoption results in yielding and plastic deformation, thereby creating high compressive residual stresses extending below the surface of the material which is desirable for hydrogen embrittlement resistance and reduction of crack initiation and growth of the component. This article is a review of information relating hydrogen embrittlement of titanium alloys and surface modification technique which influence the strength potential of titanium alloys.

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“…Based on an excellent combination of high tensile strength to weight ratio and good corrosion behavior, hardenability, and fatigue crack growth resistance, [1][2][3][4][5][6][7][8] titanium alloys are regarded as a superior and cost-effective structural materials for widely applications in aerospace, [9] marine, [10] industrial, [11] and commercial fields. [12] Hydrogen is of great interest to the energy industry as a sustainable clean energy source, and various hydrogen utilization systems have been developed to promote the widespread adoption of fuel cell vehicles or stationary fuel cell systems that used hydrogen.…”

Section: Introductionmentioning

confidence: 99%

The Hydride Precipitation Mechanisms in the Hydrogenated Weld Zone of Ti–0.3Mo–0.8Ni Alloy Argon‐Arc Welded Joints

et al. 2018

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A review of the microstructural evolution and phase transformation in the hydrogenated weld zone of Ti-0.3Mo-0.8Ni alloy argon-arc welded joints has been considered. The role of crystallographic, microstructural, and precipitation mechanisms on the defect-free properties of the hydrogenated weld zone has been analyzed, and hydride phase formations have been revealed by the influence of hydrogen on the microstructural characteristics of the weld zone. The results show face-centered cubic (FCC) δ and face-centered tetragonal (FCT) γ hydride phase formations are found in the hydrogenated 0.21 wt% H weld zone. Large lamellar, slender plate δ and long needle γ hydrides can only precipitate from the alpha lamellae, and not from the transformed beta phase due to the high hydrogen solubility found in the beta phase. Formation of the δ and γ hydrides are the result of α H phase separation reaction: α H ! α (H lean region) þ δ (H rich region) and α H ! γ (H rich region), respectively. The precipitation mechanisms and characteristics of the δ and γ hydrides formed in alpha phase are discussed in detail. Dislocation multiplication around the hydrides is promoted effectively by hydrogen addition, the fact that the quantity of dislocations around the δ hydride increased obviously compared to γ hydride indicated the α H ! δ phase transformation result in a greater volume expansion rate.

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On the Hydrogen Embrittlement of Commercially Pure Alpha Titanium: An Example from the Petrochemical Industry

Cited by 14 publications

References 20 publications

Impact of rolling conditions on the hydriding of grade 2 titanium welded tubes

Impact of rolling conditions on the hydriding of grade 2 titanium welded tubes

A critical appraisal of laser peening and its impact on hydrogen embrittlement of titanium alloys

The Hydride Precipitation Mechanisms in the Hydrogenated Weld Zone of Ti–0.3Mo–0.8Ni Alloy Argon‐Arc Welded Joints

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