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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Microstructure Evolution of Martensitic Ti-6Al-4V...

Microstructure Evolution of Martensitic Ti-6Al-4V Alloy during Warm Deformation

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Abstract:

The microstructure evolution of martensitic Ti-6Al-4V alloy was investigated through uniaxial hot compression at 700°C and a strain rate of 10^-3 s^-1. A combination of scanning electron microscopy observation in conjunction with high resolution electron back scattered diffraction (EBSD) was used to characterize the microstructure in detail. The development of the microstructure displayed continuous fragmentation of martensitic laths with increasing strain (i.e. continuous dynamic recrystallization), concurrently with decomposition of supersaturated martensite resulting in the formation of equiaxed grains. At a strain of 0.8, an ultrafine equiaxed grained structure with mostly high angle grain boundaries was successfully obtained. The current work proposes a novel approach to produce equiaxed ultrafine grains in a Ti-6Al-4V alloy through thermomechanical processing of a martensitic starting microstructure.

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THERMEC 2013

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Periodical:

Materials Science Forum (Volumes 783-786)

Pages:

679-684

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.679

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Online since:

May 2014

Authors:

Qi Chao*, Peter Hodgson, Hossein Beladi

Keywords:

Continuous Dynamic Recrystallization, Grain Refinement, Martensite, Thermo-Mechanical Processing, Titanium Alloy

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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