In order to obtain higher creep strength, the Directional Solidification (DS) Nickel-based turbine blades have been widely used in aero engines, because this advanced casting technology can improve the blade’s creep performance along the principal stress direction by forming columnar grains parallel to this direction. However, the grain structures at different regions of turbine blade are likely to be different, because the temperature field during casting process is affected by the different abrupt geometrical changes. Therefore, a variation in the creep performances at these regions is caused. To study the variation in creep strength among different regions of a DS turbine blade, this work designed and manufactured three types of DS specimens which have the geometry features of the platform, the shroud and the body part of DS turbine blade. Creep tests on these specimens were conducted under a stress level of 608MPa and temperature of 850 °C. The creep rupture life of platform-like and shroud-like specimens are about 93% and 73% of that of the body-like specimen respectively, which support that there exists a certain variation of creep strength among different regions in a DS turbine blade. It is suggested that the material’s creep strength variation among different locations of DS turbine blades should be considered in future turbine blade life design and prediction.
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ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
June 16–20, 2014
Düsseldorf, Germany
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4576-9
PROCEEDINGS PAPER
Investigation on Material’s Creep Strength Variation Among Different Locations of Directional Solidified Turbine Blades
Xiaojun Yan
Xiaojun Yan
Beihang University, Beijing, China
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Kai Zhang
Beihang University, Beijing, China
Xiaojun Yan
Beihang University, Beijing, China
Paper No:
GT2014-25803, V07AT29A009; 7 pages
Published Online:
September 18, 2014
Citation
Zhang, K, & Yan, X. "Investigation on Material’s Creep Strength Variation Among Different Locations of Directional Solidified Turbine Blades." Proceedings of the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. Volume 7A: Structures and Dynamics. Düsseldorf, Germany. June 16–20, 2014. V07AT29A009. ASME. https://doi.org/10.1115/GT2014-25803
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