Characterization and modeling for forging deformation of Ti-6Ai-2Sn-4Zr-2Mo-0.1 Si

Dadras, P.; Thomas, J. F.

doi:10.1007/bf02643797

Cited by 79 publications

(18 citation statements)

References 9 publications

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“…where the constant 0.95 is the percentage of hot deformation work translated into heat, ρ is the material density (g/cm 3 ),c p is the specific heat (J/g K), η is the adiabatic correction factor which relates to strain rate [51]. Based on Eq.…”

Section: Discussion Of Flow Softening Mechanismsmentioning

confidence: 99%

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

Lin

Chen

et al. 2016

Archives of Metallurgy and Materials

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The flow softening behaviors of a nickel-based superalloy with δ phase are investigated by hot compression tests over wide ranges of deformation temperature and strain rate. Electron backscattered diffraction (EBSD), optical microscopy (OM), and scanning electron microscopy (SEM) are employed to study the flow softening mechanisms of the studied superalloy. It is found that the flow softening behaviors of the studied superalloy are sensitive to deformation temperature and strain rate. At high strain rate and low deformation temperature, the obvious flow softening behaviors occur. With the increase of deformation temperature or decrease of strain rate, the flow softening degree becomes weaken. At high strain rate (1s−1), the flow softening is mostly induced by the plastic deformation heating and flow localization. However, at low strain rate domains (0.001-0.01s−1), the effects of deformation heating on flow softening are slight. Moreover, the flow softening at low strain rates is mainly induced by the discontinuous dynamic recrystallization and the dissolution of δ phase (Ni3Nb).

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Section: Discussion Of Flow Softening Mechanismsmentioning

confidence: 99%

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

Lin

Chen

et al. 2016

Archives of Metallurgy and Materials

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“…This is the length of interface produced per unit volume per second. The rate of interface migration per unit area of the interface is given by RM = DF/(kTb) [6] where D = Do exp [-Qso/RT] and F = grain-boundary energy. At 800 ~ Do = 6 • 10 -6 m2/s, QSD -----218 kJ/ mol, and F = 780 mJ/m 2 calculated from solid surface free energy) ~7,j8~ The value of RM is calculated to be 13 …”

Section: B Model For Dynamic Recrystallizationmentioning

confidence: 99%

Processing map for hot working of alpha-zirconium

1991

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The hot deformation characteristics of alpha-zirconium in the temperature range of 650 ~ to 850 ~ and in the strain-rate range of 10 -3 to 102 S -1 are studied with the help of a power dissipation map developed on the basis of the Dynamic Materials Model. [7'8'91 The processing map describes the variation of the efficiency of power dissipation (77 --2m/m + 1) calculated on the basis of the strain-rate sensitivity parameter (m), which partitions power dissipation between thermal and microstructural means. The processing map reveals a domain of dynamic recrystallization in the range of 730 ~ to 850 ~ and l0 -2 to 1 s -1, with its peak efficiency of 40 pct at 800 ~ and 0.1 s -1, which may be considered as optimum hot-working parameters. The characteristics of dynamic recrystallization are similar to those of static recrystallization regarding the sigmoidal variation of grain size (or hardness) with temperature, although the dynamic recrystallization temperature is much higher. When deformed at 650 ~ and 10 -3 s -t, texture-induced dynamic recovery occurred, while at strain rates higher than 1 s -l, alpha-zirconium exhibits microstructural instabilities in the form of localized shear bands which are to be avoided in processing.

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“…The above bilinear relation cannot be explained by the temperature increase caused by the compression because the data were corrected by the common method proposed by Dadras and Thomas [24]. To alleviate the effect of temperature increase, the data measured at a small strain of 0.2 were used to estimate the factor m above the critical strain.…”

Section: Strain Rate Sensitivitymentioning

confidence: 99%

Microstructure Evolution of a Multifunctional Titanium Alloy

Tian

Hao

2016

Shap. Mem. Superelasticity

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To optimize both mechanical and functional properties of multifunctional titanium alloys via grain refinement, an example of such alloys termed as Ti2448 is adopted to investigate its microstructure evolution and strain rate sensitivity by compression in the single b-phase field. The results show that flow stress and strain rate follow a bilinear relation, which is in sharp contrast with other metallic materials exhibiting a monotonic linearity. Below the critical strain of 1 s -1 , the alloy has a normal strain rate sensitivity factor of 0.265. Above the critical value, its hardening rate is ultra-low with a factor of 0.03. Inspite of ultra-low hardening, the alloy is plastic stable under the tested conditions. With the aid of electron back-scattering diffraction and transmission electron microscopy analyses, microstructure evolution via several mechanisms such as dynamic recovery and recrystallization is evaluated by quantitative measurements of grain misorientation and its distribution, sub-grain formation, and localized grain refinement. These results are helpful to obtain the homogenous ultrafine-grained alloy by multi-step thermomechanical processing.

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Characterization and modeling for forging deformation of Ti-6Ai-2Sn-4Zr-2Mo-0.1 Si

Cited by 79 publications

References 9 publications

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

Processing map for hot working of alpha-zirconium

Microstructure Evolution of a Multifunctional Titanium Alloy

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