Mechanical Properties of Fine-Grained and Ultrafine-Grained Ti-6Al-4V with Equiaxed and Bimodal Microstructures

Yan Chong; Nobuhiro Tsuji

doi:10.4028/www.scientific.net/MSF.879.344

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HomeMaterials Science ForumMaterials Science Forum Vol. 879Mechanical Properties of Fine-Grained and...

Mechanical Properties of Fine-Grained and Ultrafine-Grained Ti-6Al-4V with Equiaxed and Bimodal Microstructures

Abstract:

With the purpose of fabricating equiaxed and bimodal Ti-6Al-4V alloy with different grain/primary α (α_p) sizes, thermomechanical processing and additional annealing were carried out on samples with martensite initial microstructure. Deformation at 700°C with a strain rate of 0.01s^-1 to a true strain of 0.8 could effectively break the martensite initial microstructure into ultrafine-grained (UFG) equiaxed microstructure (mean grain size of 0.51μm) with reasonable uniformity. Subsequent annealing at 930°C with different periods were conducted to change the equiaxed microstructure into bimodal microstructures. The holing time proved to be more critical than heating rate for determining the α_p size. An UFG bimodal Ti-6Al-4V with the average α_p size of 0.55μm was successfully obtained for the first time by annealing the UFG equiaxed Ti-6Al-4V at 930°C for 2 seconds. The mechanical properties of the equiaxed and bimodal Ti-6Al-4V with different grain/α_p sizes were evaluated by tensile tests at room temperature. The bimodal Ti-6Al-4V showed superior balance between strength and uniform elongation than that of the equiaxed Ti-6Al-4V. Moreover, the uniform elongation in the bimodal Ti-6Al-4V was nearly unaffected by reduction of the α_p size.

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Periodical:

Materials Science Forum (Volume 879)

Pages:

344-349

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.344

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Online since:

November 2016

Authors:

Yan Chong*, Nobuhiro Tsuji

Keywords:

Bimodal Microstructure, Equiaxed Microstructure, Ti-6Al-4V, Ultra Fine Grain

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