| Autor: |
A.K. Bhattacharya, L.J. Chen, Michael L. Benson, J.M. Aurrecoechea, Gongyao Wang, Peter K. Liaw, Dwaine L. Klarstrom, Y.L. Lu, J.W. Blust, P.F. Browning, S.A. Thompson |
| Rok vydání: |
2006 |
| Předmět: |
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| Zdroj: |
Materials Science and Engineering: A. 433:114-120 |
| ISSN: |
0921-5093 |
| DOI: |
10.1016/j.msea.2006.06.069 |
| Popis: |
The fatigue-crack growth behavior of HASTELLOY® X, a nickel-based superalloy, was studied at the temperatures of 816 and 927 °C under isothermal conditions. Various hold times were introduced at the maximum load. The fatigue tests were conducted under load and stress-intensity-factor control modes. The crack grew faster at a higher temperature. It was also noted that the introduction of a hold time at the maximum load led to an increase in the cyclic crack-growth rate. The longer hold time gave the faster crack-growth rate, which was related to the gradual transition from transgranular to intergranular cracking. The crack-growth rates in the fatigue and creep tests were correlated with the stress-intensity factor range, ΔK, and the stress-intensity factor, K, respectively. The crack-propagation rates in the hold-time tests were predicted from the crack-growth rates obtained from both the fatigue and the creep crack-growth tests, using a semi-empirical linear summation model. Crack-growth rate predictions reproduce most of the characteristics observed experimentally. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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