Characterization of yttrium-rich precipitates in a titanium alloy weld

Kolli, R. Prakash; Herzing, Andrew A.; Ankem, Sreeramamurthy

doi:10.1016/j.matchar.2016.10.014

Cited by 10 publications

(8 citation statements)

References 21 publications

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“…For example, APT studies have revealed the formation of α 2 precipitates of varying morphologies within the α case layer formed on Ti-6Al-4V [15] and have also investigated the relationship between mechanical properties and oxygen concentration in this alloy [16]. APT has also been used to study ordering [17][18][19], oxygen and carbon segregation [20] and fine scale precipitation [21][22][23] in a range of titanium alloys.…”

Section: Introductionmentioning

confidence: 99%

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Quantifying the effect of oxygen on micro-mechanical properties of a near-alpha titanium alloy

Gardner

Gopon

Magazzeni

et al. 2021

Journal of Materials Research

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Titanium alloys are widely used in the aerospace industry, yet oxygen ingress can severely degrade the mechanical properties of titanium alloy components. Atom probe tomography (APT), electron probe microanalysis (EPMA) and nanoindentation were used to characterise the oxygen-rich layer on an in-service jet engine compressor disc, manufactured from the titanium alloy TIMETAL 834. Oxygen ingress was quantified and related to changes in mechanical properties through nanoindentation studies. The relationship between oxygen concentration, microstructure, crystal orientation and hardness has been explored through correlative hardness mapping, EPMA and electron backscatter diffraction (EBSD). It has been found that the hardening effects of microstructure and crystallography are only significant at very low-oxygen concentrations, whereas interstitial solid solution hardening dominates by order of magnitude for higher oxygen concentrations. The role of microstructure on oxygen ingress has been studied and oxygen ingress along a potential α/β interface was directly observed on the nanoscale using APT.

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Section: Introductionmentioning

confidence: 99%

“…oxygen and carbon segregation [18] and fine scale precipitation [19,20] in a range of titanium alloys.…”

Section: Introductionmentioning

confidence: 99%

Quantifying the effect of oxygen on micro-mechanical properties of a near-alpha titanium alloy

Gardner

Gopon

Magazzeni

et al. 2021

Journal of Materials Research

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“…This confirms the assumption that yttrium binds oxygen, thus increasing the stability of the supercooled b-phase upon cooling. 4,[8][9] Furthermore, such a behaviour resulted in a higher b-phase volume fraction, decreasing the hardness of the alloy. This was confirmed with the microhardness-indentation tests.…”

Section: Resultsmentioning

confidence: 99%

“…7 One of the most frequently employed alloying elements is yttrium. [8][9][10][11] Although it was already shown what microalloying of the Ti-4.8Al-1.2Mo-2.6V-0.6Cr-0.25Fe alloy with 0.06 % mass fraction of yttrium decreases the oxygen concentration in a-and b-solid solutions due to the formation of Y 2 O 3 particles, 4 detailed studies of a weld structure were not conducted. This is why our study aimed at investigating the influence of microalloying titanium alloys with zirconium and yttrium on the microstructure formation and mechanical properties of the weld joints of this alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of yttrium and zirconium microalloying on the structure and properties of weld joints of a two-phase titanium alloy

Илларионов¹,

Попов²,

Илларионова³

et al. 2017

Mater. Tehnol.

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The effect of microalloying of the Ti-4.8Al-1.2Mo-2.6V-0.6Cr-0.25Fe titanium alloy with yttrium and zirconium on the phase composition, structure and mechanical properties of welded sheets was studied using light and transmission electron microscopy, X-ray diffraction analysis and microindentation-hardness testing. A differential thermal analysis was employed to model the welding thermal cycle. It was found that alloying with yttrium led to the precipitation of Y2O3 oxide particles resulting in refining the microstructure of the alloy. In addition, yttrium additions were shown to stabilise the b-phase of the alloy that decreases the hardness of the alloy. Keywords: microalloying, rare-earth elements, titanium alloy, welding U~inek mikrolegiranja zlitine titana Ti-4.8Al-1.2Mo-2.6V-0.6Cr-0.25Fe z itrijem in cirkonijem na sestavo faze, strukturne in mehanske lastnosti je bil raziskovan s svetlobno elektronsko mikroskopijo, z rentgensko difrakcijsko analizo in s testiranjem trdote mikroindentacije. Uporabili smo diferencialno termi~no analizo za pridobitev modela za varilni termi~ni cikel. Ugotovljeno je bilo, da legiranje z itrijem vodi k razpr{enosti Y2O3 oksidnih delcev, kar se ka`e pri rafiniranju mikrostrukture zlitine. Poleg tega je bilo dokazano, da so dodatki itrija stabilizirali b-fazo v zlitini, ki zmanj{uje trdoto zlitine.

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“…A good overview of the early use of atom probe on weld metals was given by Vitek and Babu [23]. In the last few years, atom probe tomography was mainly used to characterize the precipitation behavior of Cu-bearing pressure vessel steel welds [21,[24][25][26][27] or to study welds of more exotic materials like Y-rich Ti-5111 [28], friction stir welds of nanostructured ferritic alloys [29], or dissimilar metal welds [30].…”

Section: Introductionmentioning

confidence: 99%

Precipitates in microalloyed ultra-high strength weld metal studied by atom probe tomography

et al. 2018

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Gas metal arc welding with metal-cored filler wires is frequently used to weld high strength steel constructions for lightweight and transportation applications. In the current study, microalloying is considered as strengthening concept for reaching the required mechanical properties by precipitation hardening. For this purpose, the typical microalloying elements Ti, Nb, V, and Al were added to the filler metal in a comparatively high amount (up to 0.5 m.%). All-weld metal samples with a yield strength of 1000 MPa and more were produced by gas metal arc welding. Laser-pulsed atom probe tomography was used to evaluate the potential of these elements to form clusters or precipitates and strengthen the weld metal. While Al and Nb did not form clusters, a strong tendency for clustering was found for V-and Ti-alloyed samples. The cluster size evolution and changes in chemical composition depending on the microalloying contents are discussed. Furthermore, the challenges arising from local alloying element enrichments and local differences in thermal history in the all-weld metal are addressed regarding sample preparation and data evaluation.

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Characterization of yttrium-rich precipitates in a titanium alloy weld

Cited by 10 publications

References 21 publications

Quantifying the effect of oxygen on micro-mechanical properties of a near-alpha titanium alloy

Quantifying the effect of oxygen on micro-mechanical properties of a near-alpha titanium alloy

Effect of yttrium and zirconium microalloying on the structure and properties of weld joints of a two-phase titanium alloy

Precipitates in microalloyed ultra-high strength weld metal studied by atom probe tomography

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