Fatigue and creep fatigue crack growth behaviour of alloy 800 at 550°C

被引：0
|
作者：
Ternay, F [1 ]
Burlet, H [1 ]
Robert, G [1 ]
机构：
[1] CEA, CEREM, Lab Engn Mat, F-38054 Grenoble, France
来源：
MATERIALS AT HIGH TEMPERATURES | 1998年 / 15卷 / 3-4期
关键词：
fatigue; creep fatigue creek growth; alloy; 800;
D O I：
10.1080/09603409.1998.11689597
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fatigue and creep fatigue crack growth behaviour of alloy 800 at 550 degrees C have been studied to analyse defect assessment in a steam generator. Different grades of alloy 800 have been investigated to reproduce the in service conditions. Fatigue crack growth (FCG) tests were conducted on CT20 and tubular specimens, then on welded tubes. Furthermore the influence of hold times on fatigue crack growth behaviour was studied. The results obtained on material simulating the weld heat affected zone are in agreement with the tests conducted on welded tubes. Fatigue crack growth characteristics of aged and cold-worked aged material seem to be slightly improved in comparison with base material. Finally a hold time of one minute increases strongly the FCC threshold value determined in pure fatigue but has a negligible influence on crack growth rates.
引用
收藏
页码：175 / 180
页数：6
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