Creep response of Ti–6Al–4V alloy produced by additive manufacturing: Effect of annealing at 1050 °C

Spigarelli, S.; Paoletti, Chiara; Cerri, E.; Santecchia, Eleonora; Cabibbo, Marcello

doi:10.1016/j.msea.2022.144278

Cited by 5 publications

(5 citation statements)

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“…Due to the high oxygen content, a solid solution should have surely been operative there. If the ordered precipitates also play any hardening role, which would be realistic, the use of the phenomenological Equation (10) for the model material should indeed result in high values of the apparent stress exponent and activation energy (n and Q H ) [16], exactly as those tentatively estimated here.…”

Section: Critical Assessment Of the Modelsupporting

confidence: 71%

“…Pre-oxidation produced an "α-case" ≈140 µm thick. The samples were tested using VLEs, but creep deformation did not exceed a total strain of 1%, which suggests an overestimation of the minimum creep rate under the lowest stresses-see, for example, the shape of the strain rate vs. that of the strain curves in [15,16]. The Rosen and Rottem creep data for the alloy annealed at 900 • C in a vacuum were thus compared with those published by Whittaker et al [22], Figure 9a.…”

Section: Critical Assessment Of the Modelmentioning

confidence: 99%

“…A very good description of the creep response of a dataset of pure Ti samples [14] was recently provided by an equation whose derivation was illustrated in detail in [15,16]. This equation assumes the form .…”

Section: Constitutive Equation For Cp-ti (No or Minor Effects Of Oxid...mentioning

confidence: 99%

“…According to Figures 3-5, most of the oxygen-rich zone II exhibits experimental microhardness values in a range between 200 and 600 HV (Figure 4a, the average of the four microhardness measurements in zone II gives 385 HV, which, as mentioned above, corresponds to a UTS close to 1000 Mpa in a Ti-O alloy). For reference purposes, Ti-6Al-4V alloys [15,16] also usually exhibit a UTS close to 1000 Mpa. This fact implies that oxygen-rich, pure Ti is assimilable, in terms of tensile properties, to more complex industrial alloys.…”

Section: Critical Assessment Of the Modelmentioning

confidence: 99%

“…The Rosen and Rottem creep data for the alloy annealed at 900 • C in a vacuum were thus compared with those published by Whittaker et al [22], Figure 9a. The figure also plots the model curve for Ti-6Al-4V, calculated, as above, using Equation ( 5), with the same values for the various parameters used in [16]…”

Section: Critical Assessment Of the Modelmentioning

confidence: 99%

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Oxidation Effects on Short-Term Creep Response in Air of Commercially Pure Titanium (CP-2 Ti)

Regev

Santoni

Spigarelli

2023

Metals

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The creep response in the air of commercially pure titanium was investigated at 550, 600, and 650 °C to assess the effect of oxidation on the mechanical response. Experiments demonstrated that prolonged exposures at high temperatures produced a marked reduction in the minimum creep rate under a given applied stress. Microhardness measurements showed that a hardened zone formed in proximity to the surface due to oxygen penetration into the metal. A simplified composite model was then used to describe the creep response. In this model, the sample consisted of two zones, the hard case that was enriched in oxygen and the soft pure-titanium core, both creeping with similar strain rates. Calculations led to an estimation of the dependence of the minimum creep rate on stress and temperature for the hard high-oxygen zone. The simplified composite model presented here provided a good description of the experimental creep data for pure titanium, tested in its air, and a reliable picture of the effect of oxidation on complex Ti alloys.

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Section: Critical Assessment Of the Modelsupporting

confidence: 71%