The Creep Characteristics of Model cast Ni-Cr-W-C alloys

0386289 - ÚFM 2013 RIV JP eng C - Konferenční příspěvek (zahraniční konf.)
Sklenička, Václav - Kuchařová, Květa - Kvapilová, Marie - Svoboda, Milan - Hrbáček, K.
The Creep Characteristics of Model cast Ni-Cr-W-C alloys.
Creep and Fracture of Engineering Materials and Structure. Sendai: The Japan Institute of Metals, 2012, s. 57-60. ISBN 978-4-88903-407-3.
[International Conference on Creep and Fracture of Engineering Materials and Structures (JIMIS 11) /12./. Kyoto (JP), 27.05.2012-31.05.2012]
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: cast based superalloy * precipitation hardening * phase stability
Kód oboru RIV: JG - Hutnictví, kovové materiály

In this paper the creep behaviour of two model cast Ni-Cr-W-C alloys (Alloys A and B) resistant to high-temperature oxidation with different contents of Cr, W, Zr and Fe was investigated. Uniaxial tensile creep tests were carried out at temperatures from 1023 to 1273 K and at the applied tensile stresses ranged from 20 to 250 MPa. Creep tests were followed by microstructural investigations by means of both transmission and scanning electron microscopy. A comparison between the creep characteristics of these model alloys under comparable creep loading conditions shows that the alloy B with higher content of tungsten and zirconium is more creep resistant as that of the Alloy A at lower temperatures. Possible reason for the different consequence of strengthening effects is discussed. However, the creep-rate controlling dislocation mechanism is most probably the same in both alloys.
Trvalý link: http://hdl.handle.net/11104/0215529