Characterization of Hot Workability for a Near Alpha Titanium Alloy by Integrating Processing Maps and Constitutive Relationship

Zhou, Dadi; Zeng, Weidong; Xu, Jianwei; Chen, Wei; Wang, Simin

doi:10.1002/adem.201801232

Cited by 9 publications

(7 citation statements)

References 34 publications

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“…In this model, the workpiece is regarded as a power dissipater. The total power P in the process of system deformation can be considered as two harmonizing parts [ 39 , 40 ]:

where G represents the power dissipation due to plastic deformation, and J the power dissipation associated with the change of microstructure. The fraction of power which is absorbed by deforming the material during hot processing is called the efficiency of power dissipation, η .…”

Section: Resultsmentioning

confidence: 99%

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Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

et al. 2020

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Cu-Ni-Si alloys are widely used in lead frames and vacuum devices due to their high electrical conductivity and strength. In this paper, a Cu-Ni-Co-Si-Cr-(Ce) alloy was prepared by vacuum induction melting. Hot compression tests of the Cu-Ni-Co-Si-Cr and Cu-Ni-Co-Si-Cr-Ce alloys were carried out using a Gleeble-1500 simulator at 500–900 °C deformation temperatures and 0.001–10 s−1 strain rates. The texture change was analyzed by electron backscatter diffraction. The <110> fiber component dominated the texture after compression, and the texture intensity was reduced during recrystallization. Moreover, the average misorientation angle φ for Cu-Ni-Co-Si-Cr-Ce (11°) was lower than that of Cu-Ni-Co-Si-Cr (16°) under the same conditions. Processing maps were developed to determine the optimal processing window. The microstructure and precipitates of the Cu-Ni-Co-Si-Cr and Cu-Ni-Co-Si-Cr-Ce alloys were also analyzed. The average grain size of the Cu-Ni-Co-Si-Cr-Ce alloy (48 μm) was finer than that of the Cu-Ni-Co-Si-Cr alloy (80 μm). The average size of precipitates in the Cu-Ni-Co-Si-Cr alloy was 73 nm, while that of the Cu-Ni-Co-Si-Cr-Ce alloy was 27 nm. The addition of Ce delayed the occurrence of dynamic recrystallization.

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“…In this model, the workpiece is regarded as a power dissipater. The total power P in the process of system deformation can be considered as two harmonizing parts [ 39 , 40 ]:

Section: Resultsmentioning

confidence: 99%

“…In this model, the workpiece is regarded as a power dissipater. The total power P in the process of system deformation can be considered as two harmonizing parts [39,40]:…”

Section: Processing Mapmentioning

confidence: 99%

Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

et al. 2020

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“…The above-mentioned research work on duplex phase titanium alloys are worth mentioning for recognizing the flow stress behavior, microstructure, and texture evolution of the material during hot deformation [10][11][12][13]. The relevant studies can provide reference for the current work.…”

Section: Introductionmentioning

confidence: 98%

“…The results demonstrated that the processing parameters have a significant effect on the softening mechanism. Zhou et al [11] researched the characterization of hot workability for Ti80 alloy by integrating processing maps and establishing a constitutive relationship. Xu et al [12] studied the flow softening and microstructure evolution of Ti-17 alloy and found that the microstructure evolution of alpha and beta phases together influence flow softening.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Deformation Behavior and Microstructure Changes for α/β Titanium Alloy at Elevated Temperature

Yang

et al. 2021

Metals

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In this paper, the isothermal compressive behavior of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy was investigated on a Gleeble-3500 simulator in the temperature range from 1073 to 1373 K at an interval of 50 K (while the phase transus temperature is approximately 1273 K) and the strain rate range of 0.001–10 s-1. Microstructure evolution and deformation behavior were investigated. The typical flow softening behavior during deformation is observed, which can be explained by the deformation heating effect and microstructure changes. The deformation heating effect is influenced by strain rate and deformation temperature, and it increases with the increasing strain rate and decreasing deformation temperature. In the α + β phase field, the fractions of the primary α phase decrease with the increase of deformation temperature and strain rate. In this case, dynamic recovery may be the main mechanism for microstructure evolution based on the electron back-scatter diffraction (EBSD) analysis. The fully phase transformation occurs above the β transus temperature, which is governed by Burgers orientation relations. The Zener–Hollomon parameter with an exponent-type equation was used to intuitively describe the effects of the deformation temperatures and strain rates on the flow stress behaviors. Furthermore, the influence of strain was incorporated in the constitutive analysis. A fourth-order polynomial was ideally matched to represent the influence of strain. In consequence, the constitutive equation of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy including the phase transus and compensation of the strain was developed based on the experimental results throughout the deformation process. The results indicated that the correlation coefficient (R), root mean square error (RMSE), and the average absolute relative error (AARE) were calculated to be 0.987, 3.585 MPa, and 9.62% in the single-phase region and 0.979, 18.78 MPa, and 9.16% in the duplex-phase region, respectively. Hence, the constitutive model proposed in this research can provide accurate and precise theoretical prediction for the flow stress behavior of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy.

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“…By now, considerable investigations have intensively focused on the descriptions of hot deformation behaviors for diverse metals. Phenomenological constitutive models, such as Field–Backofen (F–B) model, [ 4 ] Johnson–Cook (JC) model, [ 5–7 ] Arrhenius hyperbolic‐sine equations, [ 8–12 ] and Cingara–Queen (C–Q) equations, [ 13,14 ] are developed to precisely characterize the flow characteristics of hot deformed alloys. [ 15,16 ] Considering the specific deformation mechanisms such as dislocation motion, work hardening (WH), dynamic recrystallization (DRX), and dynamic recovery (DRV), a series of physically based constitutive models, including Voyiadjis–Abed (VA) model, [ 17–19 ] Zerilli–Armstrong (Z–A) model, [ 20–22 ] unified dislocation density‐based model, [ 23–27 ] and two‐stage physically based constitutive equations, [ 28–33 ] are used to model the flow behaviors of alloys.…”

Section: Introductionmentioning

confidence: 99%

An Enhanced Johnson–Cook Model for Hot Compressed A356 Aluminum Alloy

Chen

Lin

et al. 2020

Adv Eng Mater

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The isothermal compression experiments with the strain rates of 0.01–10 s−1 and deformation temperature range of 300–420 °C are performed to investigate the hot deformation behavior of A356 aluminum alloy. Also, the complex deformation mechanisms are analyzed. It is found that, as the strain is gradually increased, the flow stress first rises, and then the stable stress appears without a tangible peak. The microstructures exhibit large elongated grains, and only a few small new grains appear under most deformation conditions. It is because the dynamic recovery (DRV) is the dominant softening mechanism. Based on the measured data, both the original Johnson–Cook (O–JC) model and modified Johnson–Cook model (M–JC) are built for the tested aluminum alloy. However, there are different deviations between the experimental and the predicted true stresses by O–JC model and M–JC model. Considering the obvious DRV features, an enhanced Johnson–Cook (EH–JC) model is proposed by introducing the stress–dislocation relation. The accuracy of the EH–JC model is validated because the correlation coefficient between the experimental and predicted results is as high as 0.997, whereas the average absolute relative error is merely 2.84%.

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Characterization of Hot Workability for a Near Alpha Titanium Alloy by Integrating Processing Maps and Constitutive Relationship

Cited by 9 publications

References 34 publications

Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

Analysis of Deformation Behavior and Microstructure Changes for α/β Titanium Alloy at Elevated Temperature

An Enhanced Johnson–Cook Model for Hot Compressed A356 Aluminum Alloy

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