Effect Of Neutron Irradiation On Fatigue Crack Propagation In Types 304 And 316 Stainless Steels At High Temperatures
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Effect of Neutron Irradiation on Fatigue Crack Propagation in Types 304 and 316 Stainless Steels at High Temperatures
Author | : P. Shahinian |
Publisher | : |
Total Pages | : 16 |
Release | : 1973 |
Genre | : Compressible flow |
ISBN | : |
Resistance to fatigue crack propagation of pre- and postirradiation AISI Types 304 and 316 stainless steels was determined at 800 and 1100 F (427 and 593 C) using the fracture mechanics approach. The effect of irradiation on fatigue resistance was dependent upon test temperature and irradiation conditions. In general, irradiation degraded fatigue resistance at 1100 F (593 C) but at 800 F (427 C) enhancement as well was observed. In both steels irradiated in a thermal reactor to a fluence of 1.8 x 1021 n/cm2 >0.1 MeV, fatigue crack growth rates at 800 F (427 C) were lower than in the unirradiated steels for a given stress intensity factor range (?K). However, at 1100 F (593 C) the effect was reversed and crack growth rates were higher in the irradiated steels. Irradiation in a fast reactor to a fluence of ~1.2 x 1022 n/cm2 >0.1 MeV caused fatigue crack growth rates at 800 F (427 C) to increase at low values of ?K and decrease at high values of ?K. At 1100 F (593 C) the crack growth rates in the irradiated steel were either the same as or higher than in the unirradiated steel. The influence of irradiation on fatigue life generally reflected the effect observed on crack growth rate.
Fatigue Crack Propagation in Fast Neutron Irradiated Stainless Steels and Welds
Author | : P. Shahinian |
Publisher | : |
Total Pages | : 14 |
Release | : 1975 |
Genre | : Crack propagation |
ISBN | : |
Neutron irradiation to a fluence of 1.2 x 1022 neutrons (n)/cm2, > 0.1 MeV caused a small decrease in the resistance to fatigue crack propagation of Types 308 and 316 submerged-arc weld metals at 800 and 1100°F (427 and 593°C). Nevertheless, the postirradiation fatigue resistances of the weld metals were generally comparable to those of the corresponding base metal. Fatigue crack growth in Types 304 and 316 base metals were also affected by irradiation; the effect was dependent on the stress intensity factor and temperature. Although resistance to crack growth of cold-worked (25 percent) Type 304 stainless steel was only slightly reduced at 800°F by irradiation, the resistance at 1100°F was reduced markedly.
Monthly Catalog of United States Government Publications, Cumulative Index
Author | : United States. Superintendent of Documents |
Publisher | : |
Total Pages | : 1466 |
Release | : 1976 |
Genre | : United States |
ISBN | : |
Review, Naval Research Laboratory, Washington, D.C.
Author | : United States. Office of Naval Research |
Publisher | : |
Total Pages | : 250 |
Release | : |
Genre | : |
ISBN | : |