High-Temperature Oxidation Kinetics and Behavior of Ti–6Al–4V Alloy

Dong, Entao; Yu, Wei; Cai, Qingwu; Liu, Cheng; Shi, Jiaxin

doi:10.1007/s11085-017-9770-0

Cited by 69 publications

(38 citation statements)

References 29 publications

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“…At the oxide-atmosphere interface, α-alumina nucleated and grew laterally to cover a rutile base ( Figure 4a). [17] In previous studies, the α-alumina crystallites have been described as nodular, [17] flowerlike, [18] or polyhedral [22] ; however, in this study, they displayed a tetragonal-like morphology and grew to a maximum length of 1-2 µm. The rutile crystallites were larger and more equiaxed.…”

Section: Oxidation Of the Ti-6al-4v Substrate At 900°cmentioning

confidence: 60%

“…Du et al attributed this absence to the low concentration that any such phase would be present in, whilst Frangini et al reasoned that it was a consequence of vanadium dioxide being dissolved in the rutile phase. In contrast, Dong et al reported XRD evidence for titanium vanadate (TiVO 4 ) in scale formed at 850 °C to 1,100 °C. As up to 2 at% aluminum was also measured throughout the titanium‐rich regions, it is suggested here that it may be more accurate to describe the rutile as being a rutile‐based solid solution in which are dissolved some vanadium ions and aluminum ions.…”

Section: Resultsmentioning

confidence: 95%

“…Despite a number of studies having been published on the high temperature air oxidation mechanisms and kinetics of Ti-6Al-4V, [16][17][18][19][20][21] documented research concerning the morphology and composition of Ti-6Al-4V scale formed at temperatures higher than 850°C is scant. [22] This is perhaps surprising given that SPF of this alloy has been a key aerospace manufacturing process since the early 1980s. For this reason, Section 3 commences with a characterization of the oxidation of Ti-6Al-4V at 900°C.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation‐led decomposition of hexagonal boron nitride coatings on alloy substrates at 900 °C: Ti‐6Al‐4V

Fleming

2019

Materials & Corrosion

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Hexagonal boron nitride (h‐BN) coatings on Ti‐6Al‐4V substrates undergo complete decomposition in air at 900 °C. This fate is similar to that of this ceramic material on chromia‐former alloys, and unlike that of a mass of powder treated in isolation. As the ceramic and alloy oxidize concurrently, outwardly diffusing aluminum (III) ions but not the predominant titanium (IV) ions react with the boron trioxide that forms around the h‐BN basal plane peripheries. Resultant aluminum borate is incorporated into the growing scale and the boron trioxide diffusion barrier is depleted. By this mechanism, the oxidation of h‐BN is maintained at an enhanced rate, until both this material and its oxide completely decompose. Liberated nitrogen from the oxidation of h‐BN can enter the underlying scale as a randomly distributed solute in rutile solid solution. The post‐coating oxide‐atmosphere interface comprises elongated aluminum borate crystallites protruding through at the boundaries between 3–5 at% nitrogen‐doped rutile grains. It differs significantly from that of oxidized, uncoated Ti‐6Al‐4V, which is occupied by a thin α‐alumina layer atop rutile. This interface does not change with an additional 72 h of heat‐treatment.

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Section: Oxidation Of the Ti-6al-4v Substrate At 900°cmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Oxidation‐led decomposition of hexagonal boron nitride coatings on alloy substrates at 900 °C: Ti‐6Al‐4V

Fleming

2019

Materials & Corrosion

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“…Sorne of the samples were HIP-treated after LBM to reduce residual poros ity thereby improving structural integrity. A rolled Ti-6Al-4V annealed above the a ➔ p phase transformation temperature, T p =980 °C , was used as the reference material [20].…”

Section: Methodsmentioning

confidence: 99%

Influence of Microstructure and Surface Roughness on Oxidation Kinetics at 500–600 °C of Ti–6Al–4V Alloy Fabricated by Additive Manufacturing

2018

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Ti-6Al-4V alloy (TA6V) is the most commonly used titanium-based alloy and is usually manufactured by casting, forging or rolling. Additive manufacturing is a new way of processing metal alloys; it is currently used for production purposes. This study focuses on the microstructure and oxidation kinetics of Ti-6Al-4V fab ricated by laser beam melting. Sorne samples were HIP-treated (hot isostatic pres sure). Ti-6Al-4V rolled and annealed was used as a reference material. Ti-6Al-4V fabricated by LBM exhibited prior p grains elongated in the building direction with fully acicular martensite, a'. Isothermal oxidations were performed at 500, 550 and 600 °C for durations of 100, 200 and 500 h. The oxidation kinetics followed a parabolic law. The weight gain of as-built LBM samples was twice as high as that of ground LBM samples of Ti-6Al-4V, although both sets had the same oxide layer thickness and depth of oxygen diffusion in the alloy. Ground LBM samples presented an oxidation rate close to that of conventional rolled and annealed Ti-6Al-4V alloys. It was shown the higher weight gain of LBM-produced Ti-6Al-4V samples was mainly due to their higher specific area and to the oxidation of partially melted powder on their surface.

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“…The cross-section morphologies are revealed by SEM and back scattered-electron (BSE) images of the burnt product. Optical microscope image taken across the Ti40 alloy cross section shows a clear division of material phases where the upper section appears to be porous structure TiO2 [29] and the lower section presents coarse grains that are associated with the matrix alloy ( Fig. 4b).…”

Section: Microstructure and Compositionmentioning

confidence: 99%

Underlying burning resistant mechanisms for titanium alloy

Chen

Yang

et al. 2018

Materials & Design

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The "titanium fire" as produced during high pressure and friction is the major failure scenario for aero-engines. To alleviate this issue, Ti-V-Cr and Ti-Cu-Al series burn resistant titanium alloys have been developed. However, which burn resistant alloy exhibit better property with reasonable cost needs to be evaluated. This work unveils the burning mechanisms of these alloys and discusses whether burn resistance of Cr and V can be replaced by Cu, on which thorough exploration is lacking. Two representative burn resistant alloys are considered, including Ti14 (Ti-13Cu-1Al-0.2Si) and Ti40(Ti-25V-15Cr-0.2Si) alloys. Compared with the commercial non-burn resistant titanium alloy, i.e., TC4 (Ti-6Al-4V) alloy, it has been found that both Ti14 and Ti40 alloys form "protective" shields during the burning process. Specifically, for Ti14 alloy, a clear Cu-rich layer is formed at the interface between burning product zone and heat affected zone, which consumes oxygen by producing Cu-O compounds and impedes the reaction with Ti-matrix. This work has established a fundamental understanding of burning resistant mechanisms for titanium alloys. Importantly, it is found that Cu could endow titanium alloys with similar burn resistant capability as that of V or Cr, which opens a cost-effective avenue to design burn resistant titanium alloys.

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High-Temperature Oxidation Kinetics and Behavior of Ti–6Al–4V Alloy

Cited by 69 publications

References 29 publications

Oxidation‐led decomposition of hexagonal boron nitride coatings on alloy substrates at 900 °C: Ti‐6Al‐4V

Oxidation‐led decomposition of hexagonal boron nitride coatings on alloy substrates at 900 °C: Ti‐6Al‐4V

Influence of Microstructure and Surface Roughness on Oxidation Kinetics at 500–600 °C of Ti–6Al–4V Alloy Fabricated by Additive Manufacturing

Underlying burning resistant mechanisms for titanium alloy

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