Establishment of creep-fatigue damage evaluation and non-destructive testing methods for thick wall boiler component of 2.25Cr-1Mo steel
Book
·
OSTI ID:176106
- Ishikawajima-Harima Heavy Industries Co., Ltd., Tokyo (Japan)
- Kansai Electric Power Co., Inc., Osaka (Japan)
Evaluation methods of creep and fatigue interaction damage of boiler components were established for 2.25Cr1Mo steel. Creep and fatigue damage was brought about at high temperature to simulate real applied stress and microstructural change during service operation. Fatigue and creep-fatigue life was affected by surface oxide scale conditions. To minimize oxide scale effects, fatigue and creep-fatigue test were conducted at low vacuum to cancel out surface effects. Initiation cracks of fatigue and creep-fatigue formed only on the surface, which were connected to oxide scale cracks, thus showing that the oxide scale growth rate is less under vacuum conditions and that fatigue life increases about 5 to 10 times as much in an air environment the same as the test conditions. Fatigue life depends on initial small forming and propagating cracks. Creep-fatigue life assessment can be made based on the creep and fatigue damage linear summation rule without surface conditions effects. Fatigue damage in creep-fatigue should be evaluated under atmospheric conditions the same as those of the fatigue test. Fatigue and creep-fatigue damage occurs only on field part surfaces. The best evaluation method by NDE would be one which makes possible crack detection and measurement of crack length.
- OSTI ID:
- 176106
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1346-0
- Country of Publication:
- United States
- Language:
- English
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