An Optimized Geometry of Double-Cone Compression Test Samples for a Better Control of Strain Rate

Gariglio, Matheus Brozovic; Bozzolo, Nathalie; Muñoz, Daniel Pino

doi:10.1007/s11661-021-06373-8

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…The double cone geometry [10,11] offers the possibility to generate a range of plastic strain (0.4 to 1.3 with the employed geometry) along the radial direction of the sample. The cylinder geometry is used to obtain the flow curves from the compression tests when required in addition to the microstructure analyses (flow curves not shown here, being out of the scope of the paper).…”

Section: B Hot Compression Testsmentioning

confidence: 99%

Supersolvus Recrystallization and Grain Growth Kinetics for the Fine Tuning of Grain Size in VDM Alloy 780 Forgings

Haghighat¹,

Sharma

Gehrmann³

et al. 2023

Metall Mater Trans A

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VDM Alloy 780 is a new polycrystalline nickel-based superalloy developed for aeronautical applications. In most of the targeted applications, grain size after forging must be precisely controlled to meet the targeted mechanical properties and in-service life requirements. Grain size in forgings is the direct consequence of the recrystallization and grain growth kinetics which are addressed in this paper at high temperatures, above the solvus temperature of γ′ and η/δ phases. The dynamic and post-dynamic recrystallization kinetics as well as the grain growth kinetics of VDM Alloy 780 are detailed over a range of thermomechanical conditions. Dynamic recrystallization appears to be limited, with only 30 pct recrystallized at quite high strain of 1.7 applied at 1050 °C and 0.01 s−1 for instance, but this is compensated by fast post-dynamic evolution. Within the investigated thermomechanical range, recrystallization is completed with 5 minutes of post-deformation hold in VDM Alloy 780 independent of the prior strain, strain rate and dynamic recrystallization fraction. For a strain as low as 0.08, an isothermal annealing of 30 minutes at 1050 °C generates a homogenous and fully recrystallized microstructure. Capillarity driven grain growth following recrystallization is also relatively slow, for instance an exposure at 1050 °C (50 °C above the solvus temperature) for 2 hours results in an increase in average grain size from 20 to 70 μm. This opens the possibility to fine tune the grain sizes by subsequent heat treatments within a time scale that is compatible with industrial conditions. The high cobalt content (25 pct) is suspected to play a role in the control of microstructure evolution kinetics. It is noteworthy that VDM Alloy 780 is shown here to not undergo the heterogeneous grain growth phenomenon reported in low strain regions for other nickel-based superalloys, which is also an asset for applications requiring strict control of grain sizes and grain size distributions.

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Section: B Hot Compression Testsmentioning

confidence: 99%

Supersolvus Recrystallization and Grain Growth Kinetics for the Fine Tuning of Grain Size in VDM Alloy 780 Forgings

Haghighat¹,

Sharma

Gehrmann³

et al. 2023

Metall Mater Trans A

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show abstract

“…Gariglio et al. optimized the size of the double‐cone specimen to provide a homogeneous uniform equivalent strain rate [16] and solve the heterogeneity problem of the strain rate field in the double‐cone specimen. In our previous work, the double cone compression test was applied to construct the hot deformation mechanism diagram of the titanium alloy [17] .…”

Section: Introductionmentioning

confidence: 99%

High throughput construction for the deformation mechanism diagram and dynamic recrystallization of a bimodal‐sized particle‐reinforced Ti‐2.5Zr‐2Al‐1(Si,C) titanium alloy

An,

Zhou,

Wei

et al. 2023

Materials Genome Engineering Advances

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An in situ autogenous particle‐reinforced Ti‐2.5Zr‐2Al‐1(Si,C) titanium alloy is prepared by vacuum induction melting. The wide range of an effective strain between 0.2 and 1.2 and the corresponding microstructure are obtained by the double‐cone high‐throughput compression test and finite element simulation. The deformation mechanism diagram with strains of 0.2–1.2 and strain rates of 0.7–1.5 s−1 at 900°C is constructed. When the strain rate is 1.3 s−1, dynamic recovery occurs in the small strain range (<0.377), dynamic recrystallization (DRX) occurs in the medium strain range (0.377–1.182), and deformation instability occurs in the large strain range (>1.182), resulting in the deformation bands. High‐angle annular dark field and high‐resolution transmission electron microscopy are used to determine the existence of bimodal particle distribution, namely micron‐scale TiC particles and nano‐scale Ti5Si3 and (Zr, Si) particles. The average radius of the (Zr, Si) nanoparticles measured by small angle neutron scattering is 19.3 nm, and the volume fraction is 0.35%. DRX grains with an average size of 0.49 μm are obtained at 900°C, strain rate of 1.3 s−1, and strain of about 0.6. Micron‐scale particles stimulated DRX nucleation, while nanoscale particles hindered the growth of new grains, resulting in grain refinement.

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Forging and Heat Treatment Conditions that Produce Visible Grains in a γ–γ′ Nickel-Based Superalloy

Hardy

Buckingham

Severs³

et al. 2023

Metall Mater Trans A

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An Optimized Geometry of Double-Cone Compression Test Samples for a Better Control of Strain Rate

Cited by 4 publications

References 17 publications

Supersolvus Recrystallization and Grain Growth Kinetics for the Fine Tuning of Grain Size in VDM Alloy 780 Forgings

Supersolvus Recrystallization and Grain Growth Kinetics for the Fine Tuning of Grain Size in VDM Alloy 780 Forgings

High throughput construction for the deformation mechanism diagram and dynamic recrystallization of a bimodal‐sized particle‐reinforced Ti‐2.5Zr‐2Al‐1(Si,C) titanium alloy

Forging and Heat Treatment Conditions that Produce Visible Grains in a γ–γ′ Nickel-Based Superalloy

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