Creep behaviour of ultrafine-grained CP titanium processed by multi-pass rolling

Two commercially pure (CP) Ti heats containing the same total impurity content have been used under investigation. Both materials were subjected to the processing procedure method of severe plastic deformation (SPD). This procedure consists of two steps of hot rolling (at 673 K) and the final rollin...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2021-08, Vol.1178 (1), p.12013
Main Authors: Dvorak, J., Kadomtsev, A.G., Betekhtin, V.I., Sklenicka, V., Kral, P., Kvapilova, M.
Format: Article
Language:English
Subjects:
Ambient temperature
Creep tests
Hot rolling
Impurities
Microstructure
Plastic deformation
Synergistic effect
Tensile creep
Titanium
Ultrafines
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Summary:Two commercially pure (CP) Ti heats containing the same total impurity content have been used under investigation. Both materials were subjected to the processing procedure method of severe plastic deformation (SPD). This procedure consists of two steps of hot rolling (at 673 K) and the final rolling step at ambient temperature. The difference in individual chemical contents of impurities resulted in two states, both with ultrafine-grained (UFG) microstructures. For comparison reason, coarse-grained (CG) state was prepared by annealing of UFG state at temperature 823 K/1h. Microstructure investigations were performed using scanning electron microscope equipped with EBSD unit (SEM/EBSD) and transmission electron microscopy (TEM). Constant load tensile creep tests were conducted at temperature 673 K and applied uniaxial stress of 200MPa. Creep tests were run up to the final fracture of the creep specimens. The main objective of this work was to evaluate how the synergistic effect of SPD and the resulting microstructure affects the creep behaviour and properties of the studied materials.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1178/1/012013