Author
Sajadifar, Seyed Vahid, Yapıcı, Güney Güven
Publication Date
2017
Publication Place
-
Springer International Publishing
Subject
Compression testing, Constitutive equations, Grain boundaries, Grain growth, Processing, Strain rate
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
1073-5623
Record ID
2be7a674-8aa8-488b-b219-9cc2a9d39697
Library Location
Mechanical Engineering
Date
2017
Notes
TÜBİTAK
Sample Text
In the present investigation, high-temperature compression tests were conducted at strain rates of 0.001 to 0.1 s−1 and at temperatures of 873 K to 1173 K (600 °C to 900 °C) in order to study the hot deformation characteristics and dynamic softening mechanisms of two different grades of commercial purity titanium after severe plastic deformation. It was observed that the effects of deformation rate and temperature are significant on obtained flow stress curves of both grades. Higher compressive strength exhibited by grade 2 titanium at relatively lower deformation temperatures was attributed to the grain boundary characteristics in relation with its lower processing temperature. However, severely deformed grade 4 titanium demonstrated higher compressive strength at relatively higher deformation temperatures (above 800 °C) due to suppressed grain growth via oxygen segregation limiting grain boundary motion. Constitutive equations were established to model the flow behavior, and the validity of the predictions was demonstrated with decent agreement accompanied by average error levels less than 5 pct for all the deformation conditions.
DOI
10.1007/s11661-016-3929-1
