Effect of hydrogen on high temperature flow behavior of near α-Ti alloy

Babu, S.M. Jagadeesh; Kashyap, B.P.; Prabhu, N.; Kapoor, R.; Singh, R.N.; Chakravartty, J.K.

doi:10.1016/j.msea.2016.09.107

Cited by 17 publications

(3 citation statements)

References 67 publications

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“…N also forms TiN compounds because of its high affinity with Ti, which enhances the hardness and wear-properties (Jayaprakash et al , 2015). In their investigation on the effect of H on VT20 near- α Ti alloys, Jagadeesh Babu et al (2017) observed increasing H contents increases the β phase volume fraction at the same time decreases the grain size, which both major determinants of mechanical properties of alloys. C element in near- α Ti alloy promotes α phase globularization, which in turn influences the mechanical behavior of the alloy (Xu et al , 2016; Zhang et al , 2017c).…”

Section: Development Of High Strength Near-α Titanium Alloysmentioning

confidence: 99%

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Mechanical properties of near alpha titanium alloys for high-temperature applications - a review

Tabie

Wang

et al. 2020

AEAT

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Purpose This paper aims to present a broad review of near-a titanium alloys for high-temperature applications. Design/methodology/approach Following a brief introduction of titanium (Ti) alloys, this paper considers the near-α group of Ti alloys, which are the most popular high-temperature Ti alloys developed for a high-temperature application, particularly in compressor disc and blades in aero-engines. The paper is relied on literature within the past decade to discuss phase stability and microstructural effect of alloying elements, plastic deformation and reinforcements used in the development of these alloys. Findings The near-a Ti alloys show high potential for high-temperature applications, and many researchers have explored the incorporation of TiC, TiB SiC, Y2O3, La2O3 and Al2O3 reinforcements for improved mechanical properties. Rolling, extrusion, forging and some severe plastic deformation (SPD) techniques, as well as heat treatment methods, have also been explored extensively. There is, however, a paucity of information on SiC, Y2O3 and carbon nanotube reinforcements and their combinations for improved mechanical properties. Information on some SPD techniques such as cyclic extrusion compression, multiaxial compression/forging and repeated corrugation and straightening for this class of alloys is also limited. Originality/value This paper provides a topical, technical insight into developments in near-a Ti alloys using literature from within the past decade. It also outlines the future developments of this class of Ti alloys.

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Section: Development Of High Strength Near-α Titanium Alloysmentioning

confidence: 99%

“…Near- α (or super α ) Ti alloys are high-temperature Ti alloys with Ti-Al-Zr-Sn-Mo-Nb-Si alloying system whose β stabilizers (Mo, Nb and Si) are not more than 2 per cent and the Si element up to 0.5 per cent (Jagadeesh Babu et al , 2017). These stabilizers introduce a small β phase and silicide precipitates in the microstructure.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of near alpha titanium alloys for high-temperature applications - a review

Tabie

Wang

et al. 2020

AEAT

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“…Over the years, an evolutionary trend in alloy design is also observed from the (α + β) alloys to the elevated temperature near-α alloys, which contain a low amount of β stabilizer. Near-α (or super α) Ti alloys are high-temperature Ti alloys with Ti-Al-Zr-Sn-Mo-Nb-Si alloying system whose β stabilizers (Mo, Nb and Si) are not more than 2%, being the Si element up to 0.5% [ 72 , 73 ]. These stabilizers introduce a small β phase and silicide precipitates in the microstructure, allowing good thermo-mechanical properties and creep resistances suitable for application in aircraft engine [ 74 ].…”

Section: Aircraft Engines and Crmsmentioning

confidence: 99%

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

et al. 2021

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Several applications where extreme conditions occur require the use of alloys often containing many critical elements. Due to the ever increasing prices of critical raw materials (CRMs) linked to their high supply risk, and because of their fundamental and large utilization in high tech products and applications, it is extremely important to find viable solutions to save CRMs usage. Apart from increasing processes’ efficiency, substitution, and recycling, one of the alternatives to preserve an alloy and increase its operating lifetime, thus saving the CRMs needed for its manufacturing, is to protect it by a suitable coating or a surface treatment. This review presents the most recent trends in coatings for application in high temperature alloys for aerospace engines. CRMs’ current and future saving scenarios in the alloys and coatings for the aerospace engine are also discussed. The overarching aim of this paper is to raise awareness on the CRMs issue related to the alloys and coating for aerospace, suggesting some mitigation measures without having the ambition nor to give a complete overview of the topic nor a turnkey solution.

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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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Effect of hydrogen on high temperature flow behavior of near α-Ti alloy

Cited by 17 publications

References 67 publications

Mechanical properties of near alpha titanium alloys for high-temperature applications - a review

Mechanical properties of near alpha titanium alloys for high-temperature applications - a review

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

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

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