Creep Behaviour and Microstructure of Ultrafine Grained Iron Processed by ECAP

0367039 - ÚFM 2012 RIV CZ eng K - Conference Paper (Czech conference)
Král, Petr - Dvořák, Jiří - Kvapilová, Marie - Svoboda, Milan - Sklenička, Václav
Creep Behaviour and Microstructure of Ultrafine Grained Iron Processed by ECAP.
NANOCON 2011. Conference Proceedings. Ostrava: Tanger Ltd, 2011, od 75-do 76. ISBN 978-80-87294-23-9.
[Nanocon 2011. Brno (CZ), 21.09.2011-23.09.2011]
R&D Projects: GA ČR GPP108/10/P469
Institutional research plan: CEZ:AV0Z20410507
Keywords : ultrafine-grained materials * creep behaviour * equal-channel angular pressing
Subject RIV: JJ - Other Materials

Pure iron (99.99%) was subjected to equal-channel angular pressing (ECAP) with a die having an internal channel of 90°. The subsequent extrusion passes were performed by route A up to 4 passes. The microstructures of UFG iron were investigated using EBSD (electron back scatter diffraction) and transmission el. microscopy (TEM). Tension creep tests were performed on the as-pressed samples at temperature of 773 K and under applied load 60 MPa. For comparison purposes the same creep test was performed also on the unpressed state. The effect of number ECAP passes on creep behavior of pure Fe was investigated. Results showed that the creep resistance of pure Fe after ECAP is improved in comparison with the unpressed state.
Permanent Link: http://hdl.handle.net/11104/0201832