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Constitutive equation for elevated temperature flow behavior of TiNiNb alloy based on orthogonal analysis
Highlights ► The developed constitutive equation has been established based on orthogonal analysis. ► The proposed constitutive equation can precisely predict the flow stress. ► The predictability of developed constitutive equation was quantified.
Abstract The high-temperature deformation behaviors of as-cast and as-forged TiNiNb shape memory alloy under compression in the temperature range of 923–1323K and strain rate range of 0.01–10s−1 have been investigated with the view to acquiring the optimum hot deformation processing parameters. By the application of orthogonal experiment and variance analysis, the significance of the effects of strain, strain rate, deformation temperature as well as interaction between strain rate and deformation temperature on flow stress are evaluated, and the results indicate that the effect of interaction between strain rate and deformation temperature can be neglected in comparison with other factor. Thereafter, on the basis of the conclusions of orthogonal analysis, a new constitutive equation incorporating the effects of strain, strain rate and deformation temperature has been established. The developed constitutive equation enables to predict the flow stress accurately throughout the entire domain of temperature and strain rate, excepting at 973K in 0.1s−1 and 10s−1 for as-cast TiNiNb alloy and at 923K in 0.1s−1 and 1s−1 for as-forged TiNiNb alloy.
Constitutive equation for elevated temperature flow behavior of TiNiNb alloy based on orthogonal analysis
Highlights ► The developed constitutive equation has been established based on orthogonal analysis. ► The proposed constitutive equation can precisely predict the flow stress. ► The predictability of developed constitutive equation was quantified.
Abstract The high-temperature deformation behaviors of as-cast and as-forged TiNiNb shape memory alloy under compression in the temperature range of 923–1323K and strain rate range of 0.01–10s−1 have been investigated with the view to acquiring the optimum hot deformation processing parameters. By the application of orthogonal experiment and variance analysis, the significance of the effects of strain, strain rate, deformation temperature as well as interaction between strain rate and deformation temperature on flow stress are evaluated, and the results indicate that the effect of interaction between strain rate and deformation temperature can be neglected in comparison with other factor. Thereafter, on the basis of the conclusions of orthogonal analysis, a new constitutive equation incorporating the effects of strain, strain rate and deformation temperature has been established. The developed constitutive equation enables to predict the flow stress accurately throughout the entire domain of temperature and strain rate, excepting at 973K in 0.1s−1 and 10s−1 for as-cast TiNiNb alloy and at 923K in 0.1s−1 and 1s−1 for as-forged TiNiNb alloy.
Constitutive equation for elevated temperature flow behavior of TiNiNb alloy based on orthogonal analysis
Xiao, Meili (author) / Li, Fuguo (author) / Zhao, Wei (author) / Yang, Genlin (author)
2011-09-20
10 pages
Article (Journal)
Electronic Resource
English
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