Unified description of the softening behavior of beta-metastable and alpha+beta titanium alloys during hot deformation

In this work, we propose a unified description of the softening behavior of a β metastable alloy and Ti6Al4V alloy. In the first part we provide sound evidence that the hot deformation of Ti6Al4V of the beta phase above and below the beta transus temperature takes place solely by dynamic recovery at...

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Bibliographic Details
Published in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2016-01, Vol.651, p.280-290
Main Authors:	Poletti, Cecilia, Germain, Lionel, Warchomicka, Fernando, Dikovits, Martina, Mitsche, Stefan
Format:	Article
Language:	eng
Subjects:	Algorithms Beta phase Deformation Dynamic recovery Dynamics Hot deformation Load partition Parent phase reconstruction Recovery Restoration Softening Titanium alloys Titanium base alloys
Online Access:	Get full text
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Summary:	In this work, we propose a unified description of the softening behavior of a β metastable alloy and Ti6Al4V alloy. In the first part we provide sound evidence that the hot deformation of Ti6Al4V of the beta phase above and below the beta transus temperature takes place solely by dynamic recovery at moderate strains, similarly to the behavior of the Ti5Al5Mo5V3Cr1Zr near-beta alloy. This study was possible due to the combination of the fast cooling rates achieved after controlled hot deformation and the reconstruction of the parent beta phase from electron backscattered diffraction measurements of the frozen alpha phase by using an innovative developed algorithm. The dynamic recovery as a common dynamic restoration behavior for Ti6Al4V and Ti5Al5Mo5V3Cr1Zr is described mathematically with a Derby type relationship of the subgrain size and the stress of the beta phase. A rule of mixture allows the determination of the load partition between the two allotropic phases.
ISSN:	0921-5093 1873-4936