Untersuchung des Verformungsverhaltens von stengelkristallinen und einkristallinen Superlegierungen bei Temperaturen oberhalb von 900 Celsius
Untersuchung des Verformungsverhaltens von stengelkristallinen und einkristallinen Superlegierungen bei Temperaturen oberhalb von 900 Celsius
This work concerns the microstructure and the anisotropic mechanical behaviour of several, chosen nickel-base superalloys in case of directional solidification. The uni- and multiaxial, mainly strain-rate controlled experiments were run with single crystal and columnar grained, solid, cylindrical sp...
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Personal Name(s): | Nahrath, S. (Corresponding author) |
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Penkalla, Heinz-Josef / Schubert, F. / Nickel, Hubertus | |
Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
1994
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Physical Description: |
131 p. |
Document Type: |
Report Book |
Research Program: |
Addenda |
Series Title: |
Berichte des Forschungszentrums Jülich
2893 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
This work concerns the microstructure and the anisotropic mechanical behaviour of several, chosen nickel-base superalloys in case of directional solidification. The uni- and multiaxial, mainly strain-rate controlled experiments were run with single crystal and columnar grained, solid, cylindrical specimen (orientation <100>) at temperatures above 900°C. These reality-close testing conditions refer to intended future applications as material for the first row of cooled turbine blades in stationary gas turbines. The changes of the microstructure ($\gamma$'coarsening) due to pure thermal exposure and to thermal and mechanical load were analysed.The relation between axial and/or torsional stationary strain-rate and corresponding stress response was described mathematically. This description is based on a creep-potential, which is modified for anisotropic behaviour using a formalism formulated by HILL. The analysis of stationary strain-rates and measured stresses leads to a creep law, which implicates the microstructure-based unified model of PENKALLA as special case. |