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- Title
Kriechverhalten der Nickelbasislegierung Alloy 602 CA.
- Authors
Neubert, S.; Linn, S.; Scholz, A.; Oechsner, M.
- Abstract
Components used in industrial furnace and apparatus engineering are exposed to temperatures up to 1200 °C to mechanical, mostly static loading and to corrosive action caused by the ambient atmosphere. To characterize the properties of the nickel base alloy 602 CA under these conditions, the long-term creep behavior at temperatures from 800 to 1200 °C has been investigated in creep experiments. Tests on sheet metal material with different grain sizes show a considerable increase of creep strength with increasing grain size. At low stresses an abnormal reduction of the creep rate in the tertiary creep stage has been observed. Metallographic investigations have revealed two different mechanisms at work in these cases. In some, the strain rate reduction was attributed to grain coarsening. In others, a correlation with the oxidation of creep cracks is assumed. On the basis of the experimental results, a modeling of the minimum creep rate taking into account grain size, stress and temperature dependency, has been generated. Furthermore, a grain size dependent time-temperature parameter as well as a model for the calculation of creep curves has been developed. Despite the large number of influencing variables considered, a high level of precision of the models in the verification recalculation of experimental results has been achieved.
- Publication
Materialwissenschaft und Werkstoffechnik, 2015, Vol 46, Issue 9, p911
- ISSN
0933-5137
- Publication type
Article
- DOI
10.1002/mawe.201500436