Details
| Original language | English |
|---|---|
| Pages (from-to) | 779-789 |
| Number of pages | 11 |
| Journal | International journal of fatigue |
| Volume | 21 |
| Issue number | 8 |
| Publication status | Published - Sept 1999 |
| Externally published | Yes |
Abstract
The high-temperature fatigue and creep behaviour of near-α titanium alloy IMI 834 was studied for temperatures up to 650°C. In order to identify the relevant damage mechanisms, the test program involved continuous cycling, dwell tests with hold periods in tension and compression, and asymmetrical strain-time cycles. The dominant damage mechanism was found to change at a temperature of about 600°C. At low test temperatures fatigue life is largely dependent on the maximum stress of the fatigue cycle. At high temperatures a brittle oxygen-enriched subsurface layer forms, and thus, environmental degradation governs fatigue life in high-temperature low frequency tests. Lamella boundaries present in the bimodal microstructure were seen to deflect small fatigue cracks and thus, this microstructure has superior fatigue properties as compared to an equiaxed one. During long-term high-temperature exposure, however, significant degradation of the lamella boundaries was observed, and then both microstructures display similar fatigue properties.
ASJC Scopus subject areas
- Mathematics(all)
- Modelling and Simulation
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
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In: International journal of fatigue, Vol. 21, No. 8, 09.1999, p. 779-789.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - High-temperature fatigue damage mechanisms in near-α titanium alloy IMI 834
AU - Hardt, S.
AU - Maier, H. J.
AU - Christ, H. J.
N1 - Funding Information: Financial support of this study by Deutsche Forschungsgemeinschaft is gratefully acknowledged.
PY - 1999/9
Y1 - 1999/9
N2 - The high-temperature fatigue and creep behaviour of near-α titanium alloy IMI 834 was studied for temperatures up to 650°C. In order to identify the relevant damage mechanisms, the test program involved continuous cycling, dwell tests with hold periods in tension and compression, and asymmetrical strain-time cycles. The dominant damage mechanism was found to change at a temperature of about 600°C. At low test temperatures fatigue life is largely dependent on the maximum stress of the fatigue cycle. At high temperatures a brittle oxygen-enriched subsurface layer forms, and thus, environmental degradation governs fatigue life in high-temperature low frequency tests. Lamella boundaries present in the bimodal microstructure were seen to deflect small fatigue cracks and thus, this microstructure has superior fatigue properties as compared to an equiaxed one. During long-term high-temperature exposure, however, significant degradation of the lamella boundaries was observed, and then both microstructures display similar fatigue properties.
AB - The high-temperature fatigue and creep behaviour of near-α titanium alloy IMI 834 was studied for temperatures up to 650°C. In order to identify the relevant damage mechanisms, the test program involved continuous cycling, dwell tests with hold periods in tension and compression, and asymmetrical strain-time cycles. The dominant damage mechanism was found to change at a temperature of about 600°C. At low test temperatures fatigue life is largely dependent on the maximum stress of the fatigue cycle. At high temperatures a brittle oxygen-enriched subsurface layer forms, and thus, environmental degradation governs fatigue life in high-temperature low frequency tests. Lamella boundaries present in the bimodal microstructure were seen to deflect small fatigue cracks and thus, this microstructure has superior fatigue properties as compared to an equiaxed one. During long-term high-temperature exposure, however, significant degradation of the lamella boundaries was observed, and then both microstructures display similar fatigue properties.
UR - http://www.scopus.com/inward/record.url?scp=0033361967&partnerID=8YFLogxK
U2 - 10.1016/S0142-1123(99)00042-0
DO - 10.1016/S0142-1123(99)00042-0
M3 - Article
AN - SCOPUS:0033361967
VL - 21
SP - 779
EP - 789
JO - International journal of fatigue
JF - International journal of fatigue
SN - 0142-1123
IS - 8
ER -