Microstructural evolution during hot forming of Ti-6Al-4V alloy with complex initial microstructure

Bodunrin, Michael Oluwatosin; Chown, Lesley H.; Merwe, J.W. van der; Alaneme, Kenneth Kanayo

doi:10.1007/s00170-019-04162-7

Cited by 11 publications

(1 citation statement)

References 49 publications

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“…It is important to notice that in addition to these nodules, some areas are characterized by elongated α lamellae as shown on Figure 3 revealing that the initial microstructure is heterogeneous with two morphologies of α. These mixture of partially equiaxed α and elongated α grains with a network of intergranular β can be referred in the literature as a "complex microstructure" [7]. It reveals an incomplete globularization of the lamellar α during the previous thermo-mechanical processing steps.…”

Section: Methodology and Materialsmentioning

confidence: 99%

Experimental Analysis and Behaviour Modelling of the Deformation Mechanisms of a Ti-6242S Alloy under Hot and Superplastic Forming Conditions

Song

Anzu

Despax

et al. 2020

Metals

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In this work, the hot deformation characteristics of a near-α Ti-Al-2SnZr-2Mo alloy (Ti6242 alloy) with a Fine-Grained (FG) microstructure (dα = 2.86 μm) were investigated at two levels of temperature, T = 730 ∘C and T = 840 ∘C. The initial microstructure consists of equiaxed nodules of the α phase as well as some α lamellae sparsely distributed and separated by thin layers of the BCC β phase. For both temperatures, three strain rates (10−4,10−3,10−2s−1) were analysed during loading. Moreover, the microstructural evolution (α size and morphology) was also evaluated by conducting interrupted tensile tests. The different tensile testing conditions greatly influence the stress-strain response of the material as well as the microstructure evolution. Indeed, various phenomena can take place such as elongation of the grain structure, globularization, dynamic recrystallization and grain growth of the equiaxed areas depending on the temperature, the strain rate and the strain level. The FG Ti6242 alloy exhibits interesting superplastic ductility at T = 840 ∘C. At this temperature either a very gradual flow softening (at higher strain rate) or flow hardening (at lower strain rate) can be observed and are related respectively to one or more of the following mechanisms: lamellae globularization, DRX and grain growth. At the intermediate strain rate, both mechanisms, strain hardening and softening, coexist. At T = 730 ∘C, the onset of the α lamellae globularization was only promoted at low strain rate. A mechanical behavior model was developed in the temperature range of 730–840 ∘C, which was able to take into account all the observed phenomena: viscosity, softened behavior and strain hardening. Constitutive equations were calibrated from the stress-strain responses and microstructural observations, and the computed results were in good agreement with the experiments.

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Section: Methodology and Materialsmentioning

confidence: 99%

Experimental Analysis and Behaviour Modelling of the Deformation Mechanisms of a Ti-6242S Alloy under Hot and Superplastic Forming Conditions

Song

Anzu

Despax

et al. 2020

Metals

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Flow Behavior and Microstructure of Hot‐Worked TiNbTaVW Refractory High‐Entropy Alloy

Bamisaye,

Maledi,

Merwe

et al. 2024

Adv Eng Mater

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The high‐temperature deformation behavior of an equiatomic TiNbTaVW refractory high entropy alloy (RHEA) was studied at temperatures of 950, 1000, and 1050 °C and a strain rate of 10−3 s−1. The flow stress, high‐temperature strength, and softening mechanisms were analyzed and compared with the IN718 nickel‐based superalloy. The results indicate that the flow stress of both TiNbTaVW and IN718 is sensitive to deformation temperature, with high temperatures resulting in reduced flow stress. Globular grains and elongated grains were observed at 950 and 1000 °C for TiNbTaVW, signifying both dynamic recovery and dynamic globularization as the softening mechanisms. Globular grains were only observed at 1050 °C for TiNbTaVW, signifying dynamic globularization as the softening mechanism. The TiNbTaVW RHEA has a higher temperature strength of 910, 870, and 658 MPa compared to the IN718 alloy with 72, 87, and 61 MPa at 950–1000 °C/10−3 s−1. By demonstrating comparable or superior performance in specific aspects, RHEAs can be considered in the near future for potential applications traditionally dominated by nickel‐based superalloys.

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Formability and microstructure evolution of Ti-6Al-4 V alloy in electric hot incremental forming

Liu

Duan

Chu

et al. 2022

Int J Adv Manuf Technol

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Microstructural evolution during hot forming of Ti-6Al-4V alloy with complex initial microstructure

Cited by 11 publications

References 49 publications

Experimental Analysis and Behaviour Modelling of the Deformation Mechanisms of a Ti-6242S Alloy under Hot and Superplastic Forming Conditions

Experimental Analysis and Behaviour Modelling of the Deformation Mechanisms of a Ti-6242S Alloy under Hot and Superplastic Forming Conditions

Flow Behavior and Microstructure of Hot‐Worked TiNbTaVW Refractory High‐Entropy Alloy

Formability and microstructure evolution of Ti-6Al-4 V alloy in electric hot incremental forming

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