Relationship between swelling and irradiation creep in cold-worked PCA stainless steel irradiated to (approximately)178 dpa at (approximately)400(degrees)C.

摘要

The eighth and final irradiation segment for pressurized tubes constructed from the fusion Prime Candidate Alloy (PCA) has been completed in FFTF. At 178 dpa and (approximately)400(degrees)C, the irradiation creep of 20% cold-worked PCA has become dominated by the (open quotes)creep disappearance(close quotes) phenomenon. The total diametral deformation rate has reached the limiting value of 0.33%/dpa at the three highest stress levels employed in this test. The stress-enhancement of swelling tends to camouflage the onset of creep disappearance, however, requiring the use of several non-traditional techniques to extract the creep coefficients. No failures occurred in these tubes, even though the swelling ranged from (approximately)20 to (approximately)40%.