Fatigue and creep-fatigue crack growth in alloy 709 at elevated temperatures

Fatigue crack growth (FCG) and creep-fatigue crack growth (CFCG) in austenitic stainless-steel Fe-25Ni-20Cr (Alloy 709) were measured experimentally and simulated using the finite element method. Temperature conditions investigated were 550°C, 600°C and 700°C, with load hold times of 0 s, 60 s and 6...

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Bibliographic Details
Published in:Materials at high temperatures 2019-11, Vol.36 (6), p.562-574
Main Authors: Shaber, N., Stephens, R., Ramirez, J., Potirniche, G. P., Taylor, M., Charit, I., Pugesek, H.
Format: Article
Language:English
Subjects:
Alloy 709
crack growth rate
creep fatigue
finite element
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Summary:Fatigue crack growth (FCG) and creep-fatigue crack growth (CFCG) in austenitic stainless-steel Fe-25Ni-20Cr (Alloy 709) were measured experimentally and simulated using the finite element method. Temperature conditions investigated were 550°C, 600°C and 700°C, with load hold times of 0 s, 60 s and 600 s. Fracture surface was investigated using scanning electron microscopy and optical imaging. Experiments indicated that crack growth exhibits minimal sensitivity to the various loading conditions evaluated. At 600°C, crack growth rates were independent of hold time or loading frequency. At 700°C, there was a small increase in crack growth rate as a function of hold time, with a 600s hold time causing a factor of 2 increase in crack growth rate over FCG. Finite element simulations were performed to compute plasticity-induced crack closure in the presence of creep deformations at the crack tip. The simulations produced FCG and CFCG rates similar to the experimental results.
ISSN:0960-3409
1878-6413
DOI:10.1080/09603409.2019.1664079