Influence of Cryo-Processing and Post-SPD Annealing on Creep Behavior of CP Titanium

0556664 - ÚFM 2023 RIV CH eng J - Journal Article
Dvořák, Jiří - Král, Petr - Kadomtsev, A. G. - Betekhtin, V. I. - Narykova, M. V. - Kvapilová, Marie - Sklenička, Václav
Influence of Cryo-Processing and Post-SPD Annealing on Creep Behavior of CP Titanium.
Materials. ROČ. 15, č. 5 (2022), č. článku 1646. E-ISSN 1996-1944
R&D Projects: GA ČR(CZ) GC20-14450J
Institutional support: RVO:68081723
Keywords : titanium * creep properties * severe plastic deformation
OECD category: Materials engineering
Impact factor: 3.4, year: 2022
Method of publishing: Open access
https://www.mdpi.com/1996-1944/15/5/1646

The commercial purity of VT1-0 titanium was processed by the rolling process and executed at elevated, room, and cryo-temperatures. These processings led to the formation of an ultrafine-grained microstructure, with the mean grain size at a nanometer level. Some of these materials were statically annealed at a temperature of 823 K for 1 h, which led to significant subgrains and grain coarsening. The constant load creep tests in tension were carried out in argon on all states of materials, at temperatures of 648-723 K and different ranges of applied stresses. From the value of the steady-state creep rate, the control creep mechanisms were determined. The microstructure analyses were carried out via SEM and TEM. It was found that titanium prepared at elevated and room temperatures have a higher creep strength than titanium prepared at cryo-temperatures. Furthermore, the post-SPD -annealing led to a significant decrease in the creep properties. The influence of the preparation temperature on the difference of the creep behavior were discussed and explained using the microstructure analyses of the tests' samples.
Permanent Link: http://hdl.handle.net/11104/0330808