Constitutive equations for high temperature flow stress of TC4-DT alloy incorporating strain, strain rate and temperature

Xiao, Peng; Guo, Hao; Shi, Zhenning; Qin, Chun; Zhao, Zhilong

doi:10.1016/j.matdes.2013.03.009

Cited by 80 publications

(32 citation statements)

References 29 publications

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“…In recent years, researchers have developed some straindependent constitutive equations to describe the hot deformation behaviors under steady-states and non-steady states [8,10,13,16]. The flow stresses of API X70 steel [3] and API X120 [19] both began to tend towards stability when the strains reached the value of 0.3 at different temperatures and strain rates, so the steady-state stresses were selected as flow stresses to calculate their constitutive equations.…”

Section: Introductionmentioning

confidence: 99%

Correction of flow stress and determination of constitutive constants for hot working of API X100 pipeline steel

Qian

Fang

Zhang

et al. 2015

International Journal of Pressure Vessels and Piping

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Section: Introductionmentioning

confidence: 99%

Correction of flow stress and determination of constitutive constants for hot working of API X100 pipeline steel

Qian

Fang

Zhang

et al. 2015

International Journal of Pressure Vessels and Piping

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“…They are: empirical, advanced statistical and physically-based internal state variables [15][16][17]. In the empirical method, an Arrhenius-type model has been widely used to predict the flow stress of titanium alloy at elevated temperatures [18,19]. Cai et al [20] carried out an analysis of the constitutive relations of Ti-6Al-4V alloy using a revised Arrhenius-type model.…”

Section: Introductionmentioning

confidence: 99%

Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions

Yang

Wang

et al. 2016

Manufacturing Rev.

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-In this paper, a set of mechanism based unified viscoplastic constitutive equations have been established for two-phase titanium alloys with initial lamellar microstructure, which models the softening mechanisms of the alloys in hot forming conditions. The dislocation density, rotation and globularization of lamellar a-phase and their effects on flow behaviour can also be modelled. The values of material constants in the equation set have been calibrated, according to stress-strain curves and globularization fractions of lamellar a-phase obtained from compression tests at a range of temperatures and strain rates, using a genetic algorithm (GA) based optimisation method. Based on the determined constitutive equations, flow stress and globularization evolution of Ti-17 and TA15 alloys at different temperatures and strain rates were predicted. Good agreements between the experimental and computed results were obtained.

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“…Since dynamic loads (e.g., dropping and shocking) could be crucial in many working conditions [5][6][7][8][9][10][11][12], several studies have been conducted on the dynamic mechanical properties of TC4 titanium alloy. Chen et al [8] studied dynamic mechanical behaviors of TC4 titanium under a wide range of strain rates from 10 -4 to 10 3 s -1 with split Hopkinson pressure bar (SHPB) and obtained the parameters of Johnson-Cook plastic constitutive relation.…”

Section: Introductionmentioning

confidence: 99%

“…The initialization and propagation of adiabatic shear band (ASB) were characterized by ultra-high-speed photography with sufficient resolution, and the correlation of the mechanical properties was established. Peng et al [12] developed new constitutive relations for TC4-DT alloy by considering the compensation of strain rate and temperature increment. Zheng et al [13] studied the dynamic compression properties and the sensitivity of the formation of adiabatic shear band in the TC4 alloy shaving equiaxed and bimodal microstructures.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the dynamic mechanical properties of titanium alloy after thermal oxidation

Niu

et al. 2016

Appl. Phys. A

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In this study, the dynamic compressive properties of thermally oxidized TC4 (Ti-6Al-4V) titanium alloys were studied with split Hopkinson pressure bar. The dynamic tests were conducted under multiple strain rates from 400 to 2000 s -1 and different testing temperatures from 25 to 200°C. Data for the true stress-strain curves of thermally oxidized TC4 titanium alloy are presented. They show that the thermal oxidation increases both the dynamic compressive strength of TC4 titanium and the rate of strain hardening. Higher compressive strengths of the material were obtained by applying higher strain rates. Under a strain rate of 2000 s -1 , the stress-strain curves of TC4 titanium alloys exhibit both strain-rate-hardening behavior and thermal softening behavior. The oxidation temperature has little effect on dynamic properties of TC4 titanium alloy, but choosing different holding time for oxidation could greatly affect the initiation of plastic deformation and thus might potentially improve the ductility of the treated material. Furthermore, the data show that the increase in the testing temperature results in much lower yield stresses of the treated material.

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Constitutive equations for high temperature flow stress of TC4-DT alloy incorporating strain, strain rate and temperature

Cited by 80 publications

References 29 publications

Correction of flow stress and determination of constitutive constants for hot working of API X100 pipeline steel

Correction of flow stress and determination of constitutive constants for hot working of API X100 pipeline steel

Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions

Experimental study on the dynamic mechanical properties of titanium alloy after thermal oxidation

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