| Issue |
MATEC Web Conf.
Volume 321, 2020
The 14th World Conference on Titanium (Ti 2019)
|
|
|---|---|---|
| Article Number | 11056 | |
| Number of page(s) | 8 | |
| Section | Microstructure - Properties Relationships | |
| DOI | https://doi.org/10.1051/matecconf/202032111056 | |
| Published online | 12 October 2020 | |
Strain-hardenability of new strengthened TRIP/TWIP titanium alloys
a PSL Research University, Chimie ParisTech, Institut de Recherche de Chimie Paris, CNRS UMR 8247, 75005 PARIS, France
b TIMET Savoie, 62 Avenue Paul Girod, 73400 Ugine, France
c SAFRAN TECH, Rue des Jeunes Bois, Châteaufort - CS 80112 - 78772 Magny-Les-Hameaux, France
d Université Grenoble Alpes, CNRS UMR 5266, Grenoble INP, Laboratoire SIMaP, Grenoble, 38000, France
e MINES ParisTech, PSL - Research University, CEMEF - Centre de mise en forme des matériaux, CNRS UMR 7635, 06904 Sophia Antipolis Cedex, France
1 Present address: Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany
A new Ti-Cr based alloy has been developed to reach a TWIP (TWinning Induced Plasticity) effect as the main deformation mechanism. This new composition, involving Fe addition, was derived from a classical TRIP/TWIP alloy Ti-8.5Cr-1.5Al (wt%) (TCA). The main objective is to achieve an optimized strength/hardenability combination by limiting the TRIP (TRansformation Induced Plasticity) effect whose critical resolved shear stress lowers the plasticity threshold. This new alloy Ti-7Cr-1Al-xFe (wt%) (TCAF) displays excellent mechanical properties, with an increased yield strength (with respect to TCA alloy), a very high work-hardening rate and an extremely high fracture strength (UTS=1415MPa), while maintaining an excellent ductility (ε=0.38 at fracture). Both mechanical (tensile tests) and microstructural characterization at different scales (EBSD, XRD) have been performed, evidencing a dense network of fine {332}<113> mechanical twins as well as the presence of stress-induced martensite plates at twins intersections, as a secondary mechanism.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.