Flow stress constitutive relationship between lamellar and equiaxed microstructure during hot deformation of Ti-6Al-4V

Jha, Jyoti S.; Toppo, Suraj P.; Singh, Rajeev Kumar; Tewari, Ashish; Mishra, Sushil

doi:10.1016/j.jmatprotec.2019.02.030

Cited by 56 publications

(29 citation statements)

References 25 publications

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“…The flow curves of X153CrMoV12 steel at different temperatures and strain rates are displayed in Figure 5. All curves show a rapid increase in the flow stress due to a pronounced work hardening in the first phase of compression [20,21]. It is also noticeable that the flow stress decreases with an increase in temperature or with a decrease of deformation rate due to a dynamic recovery (DRV).…”

Section: True Stress-strain Behavior and Microstructure Of X153crmov1mentioning

confidence: 94%

Hot Deformation Process Analysis and Modelling of X153CrMoV12 Steel

Krbaťa

Eckert

Križan

et al. 2019

Metals

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Analysis of the high temperature plastic behavior of high-strength steel X153CrMoV12 was developed in the temperature range of 800–1200 °C and the deformation rate in the range of 0.001–10 s−1 to the maximum value of the true strain 0.9%. Microstructural changes were observed using light optical microscopy (LOM) as well as atomic force microscopy (AFM). The effect of hot deformation temperature on true stress, peak stress and true strain was evaluated from the respective flow curves. Based on these results, steel transformation was discussed from the dynamic recovery and recrystallization point of view. Furthermore, a present model, taking into account the Zener–Hollomon parameter, was developed to predict the true stress and strain over a wide range of temperatures and strain rates. Using constitutive equations, material parameters and activation energy were derived, which can be subsequently applied to other models related to hot deformation behavior of selected tool steels. The experimental data were compassed to the ones obtained by the predictive model with the correlation coefficient R = 0.98267. These results demonstrate an appropriate applicability of the model for experimental materials in hot deformation applications.

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Section: True Stress-strain Behavior and Microstructure Of X153crmov1mentioning

confidence: 94%

Hot Deformation Process Analysis and Modelling of X153CrMoV12 Steel

Krbaťa

Eckert

Križan

et al. 2019

Metals

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“…Deformation temperature and strain rate are important factors controlling the hot deformation flow stress. The hyperbolic sinusoidal constitutive equation in the Arrhenius model has been widely used to describe the complex relationships among flow stress, heat distortion temperature, and strain rate [8][9][10][11][12][13][14][15][16][17][18][19]27]. Sellars and McTegart proposed the use of a hyperbolic sine function including the thermal deformation activation energy Q and temperature T to describe the thermal activation behavior of the material.…”

Section: Constitutive Equationsmentioning

confidence: 99%

“…In addition, the hot processing map is constructed to predict the plastic deformation mechanism and the unstable deformation domain in various deformation conditions, which provides insights into the optimization of thermo-mechanical processing. This method has been widely used in various alloys, such as Al alloys [8][9][10], Mg alloys [11][12][13], Ti alloys [14][15][16], and steel [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior of a New Al–Mn–Sc Alloy

et al. 2019

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The hot deformation behavior of a new Al–Mn–Sc alloy was investigated by hot compression conducted at temperatures from 330 to 490 °C and strain rates from 0.01 to 10 s−1. The hot deformation behavior and microstructure of the alloy were significantly affected by the deformation temperatures and strain rates. The peak flow stress decreased with increasing deformation temperatures and decreasing strain rates. According to the hot deformation behavior, the constitutive equation was established to describe the steady flow stress, and a hot processing map at 0.4 strain was obtained based on the dynamic material model and the Prasad instability standard, which can be used to evaluate the hot workability of the alloy. The developed hot processing diagram showed that the instability was more likely to occur in the higher Zener–Hollomon parameter region, and the optimal processing range was determined as 420–475 °C and 0.01–0.022 s−1, in which a stable flow and a higher power dissipation were achieved.

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“…Meanwhile, the volume fraction of α p raises from 30.15% to 36.07%, 39.22%, and 43.70% during the multipass forging process. Jha et al [31] claimed that the lamellar morphology of microstructure resists the deformation initially to a greater extent compared to equiaxed morphology and causes higher ow stress compared to equiaxed. On further deformation, the lamellar microstructure kinks, bends, and breaks resulting in higher ow softening than equiaxed morphology.…”

Section: Strain Rate Of the Forging Processmentioning

confidence: 99%

Microstructural Characterization and Mechanical Properties of Ti-6Al-4V Alloy Subjected to Dynamic Plastic Deformation Achieved by Multipass Hammer Forging with Different Forging Temperatures

Fang

et al. 2019

Advances in Materials Science and Engineering

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Dynamic plastic deformation (DPD) achieved by multipass hammer forging is one of the most important metal forming operations to create the excellent materials properties. By using the integrated approaches of optical microscope and scanning electron microscope, the forging temperature effects on the multipass hammer forging process and the forged properties of Ti-6Al-4V alloy were evaluated and the forging samples were controlled with a total height reduction of 50% by multipass strikes from 925°C to 1025°C. The results indicate that the forging temperature has a significant effect on morphology and the volume fraction of primary α phase, and the microstructural homogeneity is enhanced after multipass hammer forging. The alloy slip possibility and strain rates could be improved by multipass strikes, but the marginal efficiency decreases with the increased forging temperature. Besides, a forging process with an initial forging temperature a bit above β transformation and finishing the forging a little below the β transformation is suggested to balance the forging deformation resistance and forged mechanical properties.

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Flow stress constitutive relationship between lamellar and equiaxed microstructure during hot deformation of Ti-6Al-4V

Cited by 56 publications

References 25 publications

Hot Deformation Process Analysis and Modelling of X153CrMoV12 Steel

Hot Deformation Process Analysis and Modelling of X153CrMoV12 Steel

Hot Deformation Behavior of a New Al–Mn–Sc Alloy

Microstructural Characterization and Mechanical Properties of Ti-6Al-4V Alloy Subjected to Dynamic Plastic Deformation Achieved by Multipass Hammer Forging with Different Forging Temperatures

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