Effect of environment on the creep behavior of the Ti–6Al–4V alloy

Reis, Danieli Aparecida Pereira; Silva, Cosme Roberto Moreira; Nono, Maria do Carmo de Andrade; Barboza, M.J.R.; Neto, Francisco Piorino; Perez, E.

doi:10.1016/j.msea.2005.03.073

Cited by 55 publications

(23 citation statements)

References 14 publications

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“…Previous reports of the apparent activation energies of creep in air are Q s = 319 kJ/mol for secondary creep. [12][13][14][15][16][17][18] In this case, the authors consider that the value n = 3.8 is low for a two-phase system, but it is in agreement with the stress dependence found in pure metals and solid solutions. The stress exponent for pure titanium at 923 K (650°C) is 5, which is reasonable for a pure metal.…”

Section: Resultssupporting

confidence: 71%

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Influence of Laser Treatment on the Creep of the Ti-6Al-4V Alloy

Reis

Neto

et al. 2011

Metall Mater Trans A

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Titanium and its alloys are excellent materials for structural applications in components submitted to high temperatures because of their high strength, weight ratio, good corrosion resistance, and microstructural stability. However, the affinity to oxygen is one of the main factors that limit their application as structural materials at high temperatures. The objective of this work was to estimate the influence of laser treatment on the creep of a Ti-6Al-4V alloy. Constant load creep tests were conducted at 873 K (600°C) in a standard creep machine at a stress of 125 to 319 MPa. Samples with a gage length of 18.5 mm and a diameter of 3.0 mm were used for all tests. It was observed that the effect of the oxidation was smaller and the behavior of the creep curves showed that the life time in laser treated samples was better than in the received samples. An increase of ductility of final strain and in the lifetime for the lasertreated material was observed. The decrease of the steady-state creep occurred in conjunction with the oxidation process reduction, showing that for the Ti-6Al-4V alloy, the lifetime is affected strongly by the laser treatment with an increase in this superficial protection.

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Section: Resultssupporting

confidence: 71%

“…It is observed that most of the creep life of this alloy is dominated by a constant creep rate that is thought to be associated with a stable dislocation configuration caused by recovery and hardening processes. [11][12][13] A higher creep resistance of Ti-6Al-4V is observed for laser-treated samples in all cases.…”

Section: Resultsmentioning

confidence: 97%

Influence of Laser Treatment on the Creep of the Ti-6Al-4V Alloy

Reis

Neto

et al. 2011

Metall Mater Trans A

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“…The term superalloy was first used in the mid-1940s to describe high-temperature alloys that could not only be used at elevated temperature but also maintained their strength and toughness at elevated temperature. The term referred to nickel-and cobalt-alloys [4].…”

Section: Introductionmentioning

confidence: 99%

Heat Treatments Effects on Nickel-Based Superalloy Inconel 713C

Galizoni

Couto

Reis

2019

Metals

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The purpose of this work is to study the effect of heat treatments on the microstructure of the nickel-based superalloy Inconel 713C. Three different conditions were studied and the results compared: (1) as cast; (2) solid solution treatment (1179 °C/2 h) and (3) stabilization heat treatment (1179 °C/2 h plus 926 °C/16 h). Inconel 713C is normally used in the as-cast condition, an improvement in the 980 °C stress-rupture life is often obtained by a solution heat treatment. However, the material in this condition tested under high stress at 730 °C shows a marked decreased in rupture life and ductility. The mechanical resistance in creep increases in Inconel 713C by precipitation hardening phase, with γ’ (Ni3Al) formed during the heat treatments. The characterization techniques used were: chemical analysis, hardness testing, X-ray diffraction, optical microscopy and scanning electron microscopy (SEM), EDS analyzes and thermocalculation. The SEM and EDS analysis illustrated the γ, γ’ and carbides. The matrix phase (γ), has in its constitution the precipitation of the γ’ phase, in a cubic form, and in some regions, carbides were modified through the heat treatments. (M23C6-type) and boride (M3B2 type) identified with the use of the thermocalculation. The heat treatments increase the relative intensity of niobium in the carbides. The hardness test was not achieved because the material was overaged.

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“…Поэтому большинство исследований посвящено ползучести титановых сплавов в перечисленных выше активных средах. Эти газы, как правило, снижают скорость ползучести за счет образования с титаном твердых растворов внедрения и высокопрочных частиц оксидов, гидридов и нитридов, которые после охлаждения могут существенным образом изменять физико-механические свойства сплавов [7][8][9][10][11][12][13][14][15].…”

Section: Introductionunclassified

Short-term high-temperature creep of Grade 5 titanium alloy heated in air and argon

Замараев

2019

Lett. Mater.

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The paper presents the results of studying the deformation of samples of the alloy Grade 5 while they are heated to temperatures ranging between 900 and 1350 K with constant tensile stresses of 4.45, 6.91 and 9.36 MPa, which is significantly below the yield stress of the alloy at the test temperatures (σ T ≥ 34 MPa). Under these conditions, the deformation occurs due to the mechanism of short-term creep. During testing, the samples are heated in air and argon environments. The results are compared with the results obtained earlier in similar studies for Grade 2 commercially pure titanium and Ti-5AL. The investigation has revealed a qualitative similarity of the effect of environment on the processes of creep deformation in Grade 2 commercially pure titanium, Ti-5AL alloy, and Grade 5 alloy. Herewith, all the alloys under study have close values of activation energy (from 250 to 320 kJ/mol). The experiments have shown that, as compared to previously studied alloys, Grade 5 alloy has higher temperatures of the onset of creep deformation and lower creep rates. Processing of the results has allowed us to evaluate the empirical coefficients for Grade 5 alloy in two dependences obtained earlier for the Ti-5AL and Grade 2 alloys. One dependence relates the creep rate to the heating temperature, tensile stress, and creep activation energy; the other one relates the creep deformation onset temperature (residual creep deformation within 1 hour of holding is 0.2%) to the conventional short-term creep limit.

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Effect of environment on the creep behavior of the Ti–6Al–4V alloy

Cited by 55 publications

References 14 publications

Influence of Laser Treatment on the Creep of the Ti-6Al-4V Alloy

Influence of Laser Treatment on the Creep of the Ti-6Al-4V Alloy

Heat Treatments Effects on Nickel-Based Superalloy Inconel 713C

Short-term high-temperature creep of Grade 5 titanium alloy heated in air and argon

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