Constitutive model for elevated temperature flow stress of Ti–6Al–4V alloy considering the effect of work softening

Fang Qiang; Wang Yin; Yin Jingjing

doi:10.7513/j.issn.1004-7638.2021.04.008

Volume 42 Issue 4

Aug. 2021

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2021 > 42(4): 47-51, 72

Fang Qiang, Wang Yin, Yin Jingjing. Constitutive model for elevated temperature flow stress of Ti–6Al–4V alloy considering the effect of work softening[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 47-51, 72. doi: 10.7513/j.issn.1004-7638.2021.04.008

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Fang Qiang, Wang Yin, Yin Jingjing. Constitutive model for elevated temperature flow stress of Ti–6Al–4V alloy considering the effect of work softening[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 47-51, 72. doi: 10.7513/j.issn.1004-7638.2021.04.008

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Constitutive model for elevated temperature flow stress of Ti–6Al–4V alloy considering the effect of work softening

doi: 10.7513/j.issn.1004-7638.2021.04.008

State Key Laboratory of Metal Material for Marine Equipment and Application , Anshan 114009, Liaoning, China

Received Date: 2021-06-21
Publish Date: 2021-08-10

Abstract

Abstract

A method for establishing the constitutive model considering the flow softening was proposed. Isothermal uniaxial compression tests were performed on cylindrical specimens of Ti-6Al-4V at 750 ℃ to 950 ℃ and the strain rate of 0.1 s⁻¹to 20 s⁻¹. And the flow softening that the flow stress decreases with the plastic deformation was observed. The steady flow stresses under the severe plastic deformation were obtained by fitting the experimental data via double Voce function. The constitutive equation of the alloy considering the flow softening was acquired using Levenberg-Marquardt non-linear fitting. The parameters of the constitutive equation by Levenberg-Marquardt non-linear fitting have less error than those by the linear least square fitting. The proposed method for obtaining flow stress at high temperatures is able to avoid the influence of stress fluctuation in the early stage of hot deformation, and the high-temperature steady flow stress constitutive model according to the exponential function can be obtained, which will be useful in hot working process development for new metallic materials.
- Ti-6Al-4V,
- flow softening,
- constitutive equation,
- thermocompression simulation

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References

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