High-temperature short-term creep of the Grade 2 and Ti-5Al titanium alloys under heating in air and helium

Замараев, Л. М.; Смирнов, С. В.

doi:10.1063/1.5017417

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The tests were performed on a specialised device (Fig. 2) enabling the elongation of the specimens to be continuously fixed during heating under the action of tensile stresses in different gas environments [44]. To perform the tests, specimen (1) was set in a specimen hang-up device (2) and covered with a cap forming a gas-tight chamber (3).…”

Section: Methodsmentioning

confidence: 99%

Comparative study of Shot creep of single-phase titanium alloys in air and neutral gas environment on the test temperature in range from 673 to 1323 K

Замараев

Смирнов

2019

Frattura Ed Integrità Strutturale

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The paper presents the results of comparative studies of shortterm creep in tensile tests of the VT1-0 commercially pure titanium (analogue Grade 2 according to ASTM A485) and the VT5-1 alloy (analogue Grade 6 according to ASTM B265) in air and argon. Tests by the Dorn's method were carried out in a gas-tight chamber under constant pressure. The specimens were heated by passing alternating current. Empirical coefficients are determined in power dependences of the creep rate and the conventional creep strength on test temperature in the range from 673 to 1323 K for argon and air environment and nominal stress ranging between 4.45 and 9.36 MPa. It is found that heating in argon environment, as compared to heating in air, decreases the rate of short-term creep and increases creep strength at identical nominal stresses in the entire range of test temperatures. Calculations demonstrate that the energy of the activation of short-term creep does not depend on test conditions. This indicates that the deformation mechanism is unchanged.

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Section: Methodsmentioning

confidence: 99%

Comparative study of Shot creep of single-phase titanium alloys in air and neutral gas environment on the test temperature in range from 673 to 1323 K

Замараев

Смирнов

2019

Frattura Ed Integrità Strutturale

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“…Из анализа скоростей удлинения при установившейся ползучести [9] двух тит ановых сплавов ВТ1−0 и ВТ5 при 400−1050 C в азоте, воздухе, водороде и гелии следует, что азот и гелий приводят к заметному увеличению скорости удлинения, в то время как водород (при температурах выше 500 C), наоборот, приводит к снижению скорости удлинения. Тот факт, что водород способен замедлять процесс ползучести в условиях стационарной осевой силы при высокой температуре, наблюдается в экспериментальных данных, полученных для двух титановых сплавов ВТ6 [10][11] и ВТ5 [12] при 600 C.…”

Section: Tiunclassified

Review of the author’s own results obtained from mechanical testing of titanium alloys

Nazarov¹

2022

DREAM

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Experimental data obtained at different times by the author for various titanium alloys are collected in one place. The mechanical properties of the VT1-0 alloy at normal temperature, the creep and creep rupture of the VT5 and VT6 alloys at 650 °C, the secondary creep of the VT1-0 alloy under complex stress conditions at 550 °C are considered. The final values of strains observed either at the rupture time or at mechanical test termination are taken as a criterion for combining all these data.

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“…Результаты экспериментов по определению скорости ползучести на установившейся стадии подвергнуты статистической обработке. Для аналитического описания результатов экспериментов использовали известную экспоненциальную зависимость [21] Проведенные исследования выявили качественную аналогию влияния среды на процессы деформации ползучести для сплавов Grade 2, Ti-5AL и Grade 5 [20,24]. Для всех трех сплавов различия в значениях энергии активации были невелики (250 -320 кДж / моль), что хорошо согласуется с результатами исследований [22,23].…”

Section: результаты и обсуждениеunclassified

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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High-temperature short-term creep of the Grade 2 and Ti-5Al titanium alloys under heating in air and helium

Cited by 4 publications

References 7 publications

Comparative study of Shot creep of single-phase titanium alloys in air and neutral gas environment on the test temperature in range from 673 to 1323 K

Comparative study of Shot creep of single-phase titanium alloys in air and neutral gas environment on the test temperature in range from 673 to 1323 K

Review of the author’s own results obtained from mechanical testing of titanium alloys

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

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