| Autor: |
Kvapilova, Marie, Kucharova, Kveta, Sklenicka, Vaclav, Svoboda, Milan, Hrbacek, Karel |
| Zdroj: |
Procedia Engineering; Jul2011, p839-844, 6p |
| Abstrakt: |
Abstract: A comparative study of creep and microstructural properties 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 performed. Uniaxial tensile creep tests were carried out at temperatures from 1023 to 1273K and at the applied stresses ranged from 20 to 250MPa. Creep tests were followed by microstructural and fractographic investigations. A mutual comparison between the creep characteristics of the alloys under comparable creep loading conditions shows that the alloy B with higher contents of tungsten and zirconium is more creep resistant as that of the Alloy A at lower temperatures. It is suggested that the alloy A and B earn their creep strength from the combination of solid solution hardening and precipitation hardening. However, it is difficult to quantify each contribution to the overall creep strength. Possible reason for the different consequence of strengthening effects is discussed. [Copyright &y& Elsevier] |
| Databáze: |
Supplemental Index |
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