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Single crystal nickel-base superalloys, widely used in high-temperature structural applications, have been developed with the aim of optimizing creep resistance at elevated temperatures. Creep failure in aero-engine turbine blades is now rare and is most likely to occur via a fatigue-based mechanism. Service conditions (cyclic changes in stress and temperature) are best simulated in the laboratory by thermomechanical fatigue (TMF) tests. Recently effort has been devoted to the study of precipitate morphology under creep conditions as it influences the mechanical performance. Similar analysis of the changes in precipitate structure which develop under TMF is also highly relevant.

As there is a large solidification temperature range in these single crystal alloys, the casting process results in the formation of a microstructure exhibiting a set of dendrites parallel to the growth axis. This study is focused on the influence that the solidification structures have on the development of local variations in the precipitate morphology.

Additional information

Authors: ARRELL D J, JRC Petten (NL);OSTOLAZA K M, JRC Petten (NL);VALLÉS J L, JRC Petten (NL);BRESSERS J, JRC Petten (NL)
Bibliographic Reference: Paper presented: International Symposium on Fatigue under Thermal and Mechanical Loading, Petten (NL), May 22-24, 1995
Availability: Available from (1) as paper EN 39567 ORA
Record Number: 199610268 / Last updated on: 1996-03-18
Original language: en
Available languages: en
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