The effect of severe plastic deformation processing on creep properties of metallic materials

0450097 - ÚFM 2016 RIV CH eng C - Conference Paper (international conference)
Dvořák, Jiří - Král, Petr - Sklenička, Václav - Svoboda, Milan - Kvapilová, Marie
The effect of severe plastic deformation processing on creep properties of metallic materials.
Material Forming ESAFORM 2015. Zurich: Trans Tech Publications, 2015 - (Ofenheimer, A.; Poletti, C.; Schalk-Kitting, D.; Sommitsch, C.), s. 639-644. Key Engineering Materials, 651-653. ISBN 978-3-03835-471-0. ISSN 1013-9826.
[ESAFORM 2015 - International ESAFORM Conference on Material Forming /18./. Graz (AT), 15.04.2015-17.04.2015]
R&D Projects: GA ČR(CZ) GAP108/11/2260; GA MŠMT(CZ) ED1.1.00/02.0068
Institutional support: RVO:68081723
Keywords : ECAP * ECAP route * creep * UFG materials
Subject RIV: JG - Metallurgy

This paper investigates the effect of different ECAP routes and number of ECAP passes on resulting microstructure, mechanical properties and creep behaviour of selected materials. The distinction between various ECAP routes with different number of ECAP passes applied may lead to variations both in the macroscopic distortions of the individual grains and in the capability to develop a reasonably homogeneous and equiaxed UFG microstructure. Experimental materials were processed by ECAP at room temperature using a die with an internal angle of 90°between the two parts of the channel. The ECAP pressing was performed by different routes up to 12 ECAP passes. Tensile creep tests were conducted at temperatures 473 - 673 K and at different applied stresses. Microstructure of samples was characterized by SEM-EBSD. In conclusion, the ECAP processing route and number of applied ECAP passes could play an important role in creep behaviour and their effect may be different for particular materials. The highest differences in processing routes were revealed for materials especially at lower number of ECAP passes. However, a little apparent dependence of the creep properties was observed during subsequent pressing.
Permanent Link: http://hdl.handle.net/11104/0251542