On thermal fatigue of nickel-based superalloys
Conference
·
OSTI ID:531468
- Swiss Federal Inst. of Tech., Lausanne (Switzerland). Lab. of Mechanical Metallurgy
The thermal fatigue (TF) behavior of two single crystal nickel-based superalloys, SRR99 and CMSX-4, is reported. Single edge wedge specimens are rapidly heated by induction heating of the wedge tip to a maximum temperature between 1,000 C and 1,175 C and cooled to 200 C by forced air. A constant cycle period is employed for all experiments. The strain distribution along the edge of the TF specimens is measured. Changing the induction frequency leads to different strain ranges. CMSX-4 shows crack initiation always on cast microporosities. SRR99 presents an additional oxidation/spalling/re-oxidation mechanism under low strain loading. An integrated approach combining TF and TMF (thermo-mechanical fatigue) is proposed. The applied TMF temperature-strain cycle is deduced from the measured TF-cycle. Under this new temperature-strain cycle the crack initiation life and the total life in TMF for SRR99 are compared with the TF results.
- OSTI ID:
- 531468
- Report Number(s):
- CONF-941159--; ISBN 0-8031-2001-X
- Country of Publication:
- United States
- Language:
- English
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