Development of constitutive relationships for the hot deformation of boron microalloying TiAlCrV alloys

Pu, Zhongjie; Wu, Kuang‐Hsi; Shi, Jie; Zou, Dunxu

doi:10.1016/0921-5093(94)03314-5

Cited by 50 publications

(25 citation statements)

References 6 publications

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“…The Q 3 decreased significantly to a strain value of 0.8 and insignificantly changed. The decrease in Q 3 with increasing strain is in agreement with [25,27,28,30]. The decreasing Q 3 value clearly indicates a decrease in the amount of stored energy in the material due to deformation [24,29].…”

Section: Compensation Of Strain Effectsupporting

confidence: 69%

Modelling of the Superplastic Deformation of the Near-α Titanium Alloy (Ti-2.5Al-1.8Mn) Using Arrhenius-Type Constitutive Model and Artificial Neural Network

Mosleh

Mikhaylovskaya

Котов

et al. 2017

Metals

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Abstract:The paper focuses on developing constitutive models for superplastic deformation behaviour of near-α titanium alloy (Ti-2.5Al-1.8Mn) at elevated temperatures in a range from 840 to 890 • C and in a strain rate range from 2 × 10 −4 to 8 × 10 −4 s −1 . Stress-strain experimental tensile tests data were used to develop the mathematical models. Both, hyperbolic sine Arrhenius-type constitutive model and artificial neural-network model were constructed. A comparative study on the competence of the developed models to predict the superplastic deformation behaviour of this alloy was made. The fitting results suggest that the artificial neural-network model has higher accuracy and is more efficient in fitting the superplastic deformation flow behaviour of near-α Titanium alloy (Ti-2.5Al-1.8Mn) at superplastic forming than the Arrhenius-type constitutive model. However, the tested results revealed that the error for the artificial neural-network is higher than the case of Arrhenius-type constitutive model for predicting the unmodelled conditions.

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Section: Compensation Of Strain Effectsupporting

confidence: 69%

Modelling of the Superplastic Deformation of the Near-α Titanium Alloy (Ti-2.5Al-1.8Mn) Using Arrhenius-Type Constitutive Model and Artificial Neural Network

Mosleh

Mikhaylovskaya

Котов

et al. 2017

Metals

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“…There are three Arrhenius-type equations that have been widely used to describe the relationships between stress and temperature as well as strain rate [34,35]:…”

Section: Influence Of Hydrogen On Activation Energymentioning

confidence: 99%

“…But, Pu [35] and Radovi [37] found that the activation energy of deformation is related to the strain. Drobnjak et al [38] had concluded that the deformation temperature and strain would affect the activation energy of deformation.…”

Section: Influence Of Hydrogen On Activation Energymentioning

confidence: 99%

Influence of hydrogen content on hot deformation behavior and microstructural evolution of Ti600 alloy

Zhao

Ding

Hou

et al. 2010

Journal of Alloys and Compounds

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Isothermal hot compression tests of a Ti600 alloy after hydrogenation were carried out over the temperature range of 760 to 880℃ and strain rate range of 0.01 to 10 s-1. The influence of hydrogen content was studied on the flow stress and activation energy of deformation. The microstructural changes were examined by transmission electron microscopy (TEM). The results show that the addition of 0.3% hydrogen in Ti600 alloy can decrease the hot deformation temperature by 80 •C and increase the deformation strain rate by two orders of magnitude. Both the flow stress and activation energy of deformation of Ti600 alloy decrease gradually with increasing hydrogen content in the hydrogen range of 0 to 0.3%. TEM observation suggests that dynamic recrystallization (DRX) is promoted after hydrogenation. Hydrides δ (fcc structure) exist in the specimens with 0.3% and 0.5% hydrogen, and the hydrides tend to be broken up and twisted with increasing hydrogen content after deformation. The mechanism of hydrogen reduced flow stress of Ti600 alloy has been discussed in detail. Isothermal hot compression tests of a Ti600 alloy after hydrogenation were carried out over the temperature range of 760 to 880• C and strain rate range of 0.01 to 10 s −1 . The influence of hydrogen content was studied on the flow stress and activation energy of deformation. The microstructural changes were examined by transmission electron microscopy (TEM). The results show that the addition of 0.3% hydrogen in Ti600 alloy can decrease the hot deformation temperature by 80• C and increase the deformation strain rate by two orders of magnitude. Both the flow stress and activation energy of deformation of Ti600 alloy decrease gradually with increasing hydrogen content in the hydrogen range of 0 to 0.3%. TEM observation suggests that dynamic recrystallization (DRX) is promoted after hydrogenation. Hydrides ı (fcc structure) exist in the specimens with 0.3% and 0.5% hydrogen, and the hydrides tend to be broken up and twisted with increasing hydrogen content after deformation. The mechanism of hydrogen reduced flow stress of Ti600 alloy has been discussed in detail.

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“…A phenomenological approach was proposed by Jonas et al 4 , in which the flow stress is expressed by the hyperbolic laws in an Arrhenius-type equation. And this equation has been widely used to represent the elevated temperature flow behavior of a range of metals or alloys [5][6][7][8] . However, there are some limitations for the Arrhenius-type equation.…”

Section: Introductionmentioning

confidence: 99%

The improved arrhenius model with variable parameters of flow behavior characterizing for the as-cast AZ80 magnesium alloy

Quan

Shi

et al. 2013

Mat. Res.

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In order to study the hot working behaviour of as-cast AZ80 magnesium alloy, a series of isothermal upsetting tests with height reduction of 60% were performed at the temperature range of 523-673 K and the strain rate range of 0.01-10 s -1 on a servo-hydraulic Gleeble-1500 machine simulator. Based on the regression analysis for Arrhenius type equation of flow stress, the activation energy of deformation was determined to be Q = 168.6606 KJ·mol -1 , and material constants A, n and α in the equation also were calculated respectively to predict the peak stress during hot deformation. A 7 th order polynomial was used to represent the influence of strain on these parameters (i.e Q, lnA, n and α). The Arrhenius equation was further developed by taking account of the effect of strain on the flow stress to describe the flow behavior during the whole experimental temperature and strain rate range. Then comparison between the predicted results and test results shows that the correlation coefficient and average absolute relative error is 0.99 and 6.63%, respectively. The flow stress predicted by developed equation can give an accurate and precise description of the flow behaviour for AZ80 magnesium alloy.

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Development of constitutive relationships for the hot deformation of boron microalloying TiAlCrV alloys

Cited by 50 publications

References 6 publications

Modelling of the Superplastic Deformation of the Near-α Titanium Alloy (Ti-2.5Al-1.8Mn) Using Arrhenius-Type Constitutive Model and Artificial Neural Network

Modelling of the Superplastic Deformation of the Near-α Titanium Alloy (Ti-2.5Al-1.8Mn) Using Arrhenius-Type Constitutive Model and Artificial Neural Network

Influence of hydrogen content on hot deformation behavior and microstructural evolution of Ti600 alloy

The improved arrhenius model with variable parameters of flow behavior characterizing for the as-cast AZ80 magnesium alloy

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